Gravitational Physics and Astronomy 2022

4 Dec 2022, 08:00 → 9 Dec 2022, 16:00 Africa/Cairo

Abdel Nasser Tawfik (ENHEP Egyptian Network of High Energy Physics (EG))

Presentation Material:

All speakers are kindly advised to upload their presentations in pdf format prior to the announced time slots. We also recommend to upload video records. 

1.  Please click "Call for Abstract". There you find a list of your submitted abstracts. 
2. Then you can click on an approved abstract to display its page. 
3. Although, this is no longer editable, you still able to follow the link "go to contribution", where you find a button to upload your file(s) as "presentation materials". 

 

MDPI Physics Journal:

All invited contributions will be APC-waived if published in "Physics". While the journal welcomes high-quality submissions; meantime,  it keeps the right to reject the invited papers if they are not qualified. 

https://www.mdpi.com/journal/physics/special_issues/SPGPCC

1. All approved talks shall be published as "full research papers" - not just proceedings - in a "special issue" of the MDPI open-access journal "Physics" https://www.mdpi.com/journal/physics - Scopus indexed and has CiteScore 2.2.
2. For each submission, a single-blind peer-review process will be performed and at least two peer-review reports shall be collected.
3. The guest editor, the conference organizer is responsible for making decisions as to whether a paper should be accepted or not after peer review and appropriate authors' revision. 
4. https://www.mdpi.com/journal/physics/special_issues/SPGPCC

https://www.mdpi.com/journal/physics

https://www.mdpi.com/journal/symmetry

 

Summary:

The ultimate objectives of this conference are to develop theoretical approaches to successfully reconcile principles of the general theory of relativity (GR) and quantum mechanics (QM). The general theory of relativity and the theory of quantum mechanics are fundamentally different frameworks that successfully separately deliver precise and reliable explanations of how Nature works. Accordingly, these obviously lead to genuinely incompatible descriptions of reality. The violation of the principles of relativity and equivalence, at quantum scales, belongs to the main conceptual difficulties of reconciling principles of quantum mechanics with general relativity so that their scales of applicability are entirely distinct. By the end of the day, this everlasting problem is not a trivial task that would be carried out by a few scholars. Its profound trans-disciplinary urges to unify the forces and skills of a huge global collaboration. The conference does not only aim at gathering experts but rather defining research directions. This is not limited to the narrow notion of quantizing GR or gravitizing QM. The entire spectrum of cosmology and high-energy physics either theoretical or phenomenological or computational shall be converted by the selected papers. This also includes all mathematical development contributing to quantizing GR and/or gravitizing QM.

We are witnessing a profound rapid change in our understanding of the phenomenon of Gravitation. We are exploring various implications of the general theory of relativity, and of its modified versions, in which gravitation is a consequence of the curvature of spacetime, and also various investigations into the mathematical foundations of the general theory of relativity, the nature of spacetime, and the imprints of quantum mechanics. We have been commissioning sophisticated high-energy experiments aiming at understanding the elementary particles that are the fundamental constituents of baryonic and leptonic matter and their underlying forces. 

 

Conference Poster:

 

 

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GPA22-Poster.jpg

Sunday 4 December

Registration

Opening

11:45 Coffee Break

Public outreach: Public Lectures

14:00 Lunch Break

Students Lectures

Monday 5 December

1 Production of Primordial black holes via single field inflation and observational constraints

In a class of single field models of inflation, the idea of primordial black holes (PBHs) production is studied. In this case, the dynamics on small cosmological scales differs significantly from that of the large scales probed by the observations of cosmic microwave background (CMB). This difference becomes a virtue in producing correct physical ambiance for the seeds required to produce PBHs. Thus, once the perturbed scales re-enter the horizon of our Universe during the later epochs of radiation domination and subsequent matter domination, these seeds collapses to produce PBHs. We have shown, in this class of model, depending on the model parameters and the class defining set parameters, one can have PBHs formed for a vast mass ranges from $10^{-18}$ to $10^{6}$ solar mass ($M_\odot$). We have also shown, for a particular class of model, the total dark matter density today can be attributed to the PBHs density. The vast range of the mass depending on the class parameter, gives ample opportunity to study enriched phenomenological implications associated with this model to probe the nascent Universe dynamics.

Speaker: Jayesh Jain (National Institute of Technology, Rourkela, India)

2 Gravitational slip parameter and Gravitational Waves in Modified Gravity theories

Despite the discovery of late-time accelerated expansion of the universe, we still have no clue about the physics behind that. Therefore, the answer might be lied in Modified Gravity theories. A modification in geometric structure of space-time causes noticeable differences in gravitational waves equation compared to the known form of gravitational waves in general relativity.
Various gravity theories have two general phenomenological effects at the level of linear and scalar perturbation:
1. A modification of the strength of gravity at large scales
2. An alteration of the weak gravitational lensing effect
Measurement of the two aforementioned effects allows us to obtain gravitational slip parameter ɳ; which is the ratio of two scalar gravitational potentials ɳ=Φ/Ψ.
The existence of gravitational slip parameter (ɳ≠1) in the presence of perfect fluid matter is a clue of a modification in gravity. In addition, this parameter is a model independent quantity which distinguishes the groups of gravity models. In this research, we study the gravitational slip parameter and gravitational waves equation in the context of theories including torsion, such as Einstein-Cartan theory.

Speaker: Ms Maryam Ranjbar (Master's student at Golestan University, Iran.)

Abstract.pdf

3 Graphene in Anti deSitter space

In this work,we study the (2+1) dimensional massless dirac equation within a uniform magnetic field in the
commutation relations of the Anti deSitter space.Firstly, we solved the system in order to obtain the en-
ergy eigenvalues and the corresponding wave function as Jacobi polynomials by using the Nikiforov-Uvarov
method, we find the findings have been affected by the studied deformation of the space AdS which has a
hard confinment for large values of n (the quantum number)

Speaker: Lakhdar Sek

Manuscript GPA.pdf

11:30 Coffee Break

4 Covariant Hamiltonians for F(R) Gravity

The conventional Hamiltonian theory fails to provide covariant Hamiltonian description
of relativistic physics. To achieve covariant Hamiltoninan description, the covariant
Hamiltonian theory also called Weyl-de Donder theory can be used. With its help,
we have shown, that covariant Hamiltonian can be found for F(R) gravity.
F(R) gravity is a modification of General Relativity, where scalar curvature in
the Lagrangian is replaced with an unspecified function F(R) of scalar curvature.
F(R) gravity can be formulated in Jordan frame and using the Weyl transformation
also in Einstein frame. For both frames, the covariant Hamiltonians can be formulated
and also it can be demonstrated that they are bound with canonical transformation.

Speaker: Bohuslav Matouš (Masaryk University, Brno, Czechia)

covariant_hamiltonians_fr.pdf

covariant_hamiltonians_video.mkv

5 SCHWARZSCHILD RADIUS FOR ELECTRIC CHARGE

SCHWARZSCHILD RADIUS FOR ELECTRIC CHARGE

The aim of this work is to prove the formula for the Schwarzschild radius analog in case of a static spherically symmetric electric charge. The work contains two elegant proofs of the formula for the gravitational radius and for its analog in the case of an electric charge. The author mathematically proves that the Schwarzschild radius formula should not have a multiplier of 2. The formula for the Schwarzschild radius analog in case of a static spherically symmetric electric charge was obtained. Proposed by the author in 2006 the relationship formula between the electric charge and the energy of this electric charge was applied in the proof of the formula for the Schwarzschild radius analog in case of a static spherically symmetric electric charge. And this fact, on the author's opinion, is another confirmation of the statement validity about the electric charge equivalence and its energy. An analysis was carried out on the correspondence of the formula for the Schwarzschild radius analog in case of a static spherically symmetric electric charge to the Reissner-Nordström and Schwarzschild solutions results and it is shown that they are in full agreement with each other. The radiation temperature expression is proposed for a spherically symmetric black hole with a static electric charge, but without rotation. An expression is obtained for the particles production probability estimating in a static electric field of a black hole. The author proposes the Coulomb’s law application limit explanation. The author explains the existence possibility of long-lived charged black holes. The expounded ideas in this work, in the author’s opinion, have absolute originality and novelty and require further discussion for a more detailed research. The work proposes an original method of the gravity formulas converting into the electricity formulas and vice versa, which allows finding unknown dependencies in physics. This work is another step towards the standardization of physics and its formulas and to some general approach in the problems solving from completely different sections of physics. This work considers some general approach to the problems solving in such sections of physics as gravity and electricity. And it is possible due to the analogy of formulas, which include such physical quantities as mass and electric charge.
Keywords: the Schwarzschild radius, the electric charge non-invariance, gravitational constant, the Coulomb’s law application limit, the Reissner-Nordström solution.

Yevhen Lunin
E-mail: btkza@ukr.net
ORCID: 0000-0002-5233-6353

Speaker: Yevhen Lunin

article GRA2022 Caire in MDPI.doc

article GRA2022 Caire in MDPI.pdf

YEVHEN LUNIN SCHWARZSCHILD.pdf

YEVHEN LUNIN SCHWARZSCHILD.ppt

6 The Gravitational Memory Effect

In this dissertation we intend to study the background related to the memory effect that leads to "gravitational-wave memory effect" and two types of memory effect:(1) We intend to study a whole outline of what is memory effect.(2) We intend to solve the linear memory for N Gravitationally Unbound Particles where we will study different kinds of spherical harmonics,mass quadrapole leading to linear memory effect.

$${\Delta{h^{TT}_{jk}}=\triangle{{\sum_{A=1}^{N}}}{\frac{4M_{A}}{r{\sqrt{1-v^{2}_{A}}}}[\frac{v^{j}_{A}v^{k}_{A}}{1-{{v_{A}.N}}}]^{TT}}}$$ (3)Then we try to examine the memory effect for the individual radiated neutrinos\cite{mukhopadhyay2021memory} $$ {h^{xx}_{TT}}={h(r,t)}={{\frac{2G}{rc^{4}}}{\int^{t-r/c}_{{-\infty}}}dt'L_{\nu}(t'){\alpha(t')}}$$,where c is the speed of light, t is the time post bounce and G is the universal gravitational constant. ${L_{\nu}} $ is the all-flavors neutrino luminosity $\alpha$ is the time-varying anisotropy parameter as mentioned in \cite{mukhopadhyay2021neutrino}
(4) Then we will discuss briefly about the introduction of non linear memory effect.

Speaker: Ms DEESHANI MITRA (St Xavier's College(Autonomous),Kolkata)

THE_GRAV_WAVE_MEMORY_EFFECT_PRESENTATION (10).pdf

7 The informational physical model and fundamental physical problems

This article is some review of results that were obtained at 2007-2021 years development of “The Information as Absolute” concept and the informational physical model, which is based on the concept; including a number of fundamental physical problems are briefly considered in framework of the conception and the model. Recently in physics there are several publications, that present lists of the problems. However, those lists are essentially incomplete, for at least two reasons. Firsts of all, a number of phenomena are studied traditionally by philosophy, and so corresponding problems are usually considered to be “metaphysical”. However, they relate also to some concrete physical phenomena. For example, physics evidently studies Matter, and so the metaphysical problems “what is ontology of Matter”, “what is “Space”, “Time” and a few other physical phenomena and notions as well, are really a Meta-physical problem “what does physics study?” There are other fundamental physical problems, which are not considered as such in physics, and are absent in the “fundamental problems lists”. Those include the problems, which really exist, yet are incorporated into standard physical theories, and so are fundamental “implicitly”, which in physics are “solved by default”. Note, though, that a number of “Meta-physical”, and concrete fundamental, problems more in detail are considered in the paper “The Informational Conception and Basic Physics”, https://arxiv.org/abs/0707.4657 , v5 (2021), so this paper is, in certain sense, an expanded conclusion of this paper, which includes, correspondingly, more in detail consideration of some more general physical problems. Besides, the concrete problem “What is Life”, and the rational cosmological model, where a few vague points in standard cosmology rather probably are rationally clarified, while the fundamental problem “matter – antimatter asymmetry” in Matter is solved practically for sure, are considered, and one of recently published rather complete “lists of fundamental problems” is commented in Appendix.

Speaker: Sergey Shevchenko (Institute of Physics of NAS of Ukraine, ret., now independent researcher)

AAAEEE.pdf

AAAEEE.pptx

AA_imp_06_1_EN_E+TEXT__PRNTEr_22.pdf

Forces_Main_v2.pdf

Forces_Main_VRGpr_VRG_G.pdf

Shevchenko_Physics_submission_compact.pdf

Shevchenko_Physics_submission.doc

Shevchenko_Physics_submission.pdf

S Shevchenko.mp4

14:00 Lunch Break

8 The History of The Cosmos; From The Big-Bang to The Present-Epoch

In 2007, Storti predicted that the value of the Cosmic Microwave Background Radiation (CMBR) Temperature may be improved by one-order-of-magnitude; from the Particle Data Group (PDG) value of [T0 = 2.725 ± 0.001 (K)] to [T0 = 2.7254 (K)]. In 2011, the PDG revised their value of CMBR to [T0 = 2.7255 ± 0006 (K)]; confirming Storti’s prediction. In 2008, Storti predicted a ΛCDM Hubble Constant of [H0 = 67.0843 (km/s/Mpc)]. In the same year, the PDG published their value as being [H0 = 73 ± 3 (km/s/Mpc)]. In 2013 the PDG published a revised value of [H0] distributed via the Planck Collaboration (PC) utilising the Planck Satellite (PS) as being considerably lower [H0 = 67.3 ± 1.2 (km/s/Mpc)]; again confirming Storti’s prediction. These predictions & experimental confirmations, in particular the value of [H0] being successfully predicted five (5) years in advance of the PC & without PS instrumentation, demonstrates the power of the technique applied; i.e. the Electro-Gravi-Magnetic (EGM) Photon Radiation Method (PRM). Herein, we utilise the EGM-PRM technique {constrained by the present value of CMBR [T0 = 2.7255 (K)]} to calculate the present values of: (i) the ΛCDM Hubble Constant [H0 = 67.1181447977434 (km/s/Mpc)] {whereas the PDG-2022 value is [H0 = 67.4 ± 0.5 (km/s/Mpc)]}, (ii) the Dark Energy Density Parameter [ΩΛ = 0.677345709533812] {whereas the PDG-2022 value is [ΩΛ = 0.685 ± 0.007]}, (iii) the Pressureless Matter Parameter [Ωm = 0.322654290466188] {whereas the PDG-2022 value is [Ωm = 0.315 ± 0.007]}, (iv) the Deceleration Parameter [q0 = −0.338672854766906] {whereas a PDG-2022 value is not specified} & (v), the Cosmological Constant [Λ = 0.789639109726698 10^-56 (cm-2)] {whereas the PDG-2022 value is [Λ = 1.088 10^-56 (cm-2)]}. The EGM-PRM is subsequently utilised to describe the complete History of The Cosmos from the instant of The Big-Bang to the Present-Epoch; in complete agreement with the Standard Model of Cosmology (SMoC) & compliant with all currently available experimental observations. In addition, Cosmological Inflation (CI) & Accelerated Cosmological Expansion (ACE) are derived organically, demonstrating that CI ceased by approximately [t = 7.8793484858429 10^-23 (s)] & apparent ACE [q = 0] commenced at approximately [t = 9.63456829206598 (Gyr)]; in precise agreement with the Frieman et. al. {FermiLab: 2008} determination of [~ 10 (Gyr)]. We also demonstrate that the PDG-ACE 2019-2022 “age when acceleration was zero” value of [7.7 (Gyr)] denotes a misinterpretation of results; that is, the PDG misinterpret [Λ = 0] for [q = 0] at [7.7 (Gyr)]. Subsequently, we assert that the PDG value proximally corresponds to our determination that [Λ = 0] at [t = 7.28426797653236 (Gyr)].

Speaker: Riccardo Storti

[CERN] The History of The Cosmos [720p]

[CERN] The History of The Cosmos [PPT]

[CERN] The History of The Cosmos [YouTube]

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[FULL-CERN] The History of The Cosmos [PPT]

[FULL-CERN] The History of The Cosmos [YouTube]

[Pre-Print] The History of The Cosmos; From The Big-Bang to The Present-Epoch

The History of The Cosmos (CERN) - [Research Article]

The History of The Cosmos (CERN) - [Research Article]

9 Gravitational entropy, cosmology and black holes

The Weyl curvature hypothesis by Penrose describes the evolution of the universe according to the second law of thermodynamics using a form of gravitational entropy, described by the Weyl curvature tensor. Using this, the evolution of the universe is guided by a monotonically increasing Weyl curvature, and the proposal has several conditions, one of them being that the gravitational entropy reduces to the Hawking-Bekenstein entropy for black holes. In this talk, we will discuss some of the aspects of this proposal, formalisms and their structure wihh to respect to cosmology and black holes.

Speaker: Vaibhav Kalvakota

GPAC22_talk_kalvakota.pdf

10 Discrete Relativity

In General Relativity (GR) Einstein equation is constructed from GR lagrangian under an implicit assumption. It is that in regular matter, energy of particles in motion can be completely discarded. This appears when the opposite assumption is tried and when its consequences in GR are studied. This study is lead by a macroscopic approximation given by a new equation called "Discrete Relativity equation". An unexpected consequence is that strong theoretical arguments exist for replacement of today's assumption by the new one. The most important consequence is that the "surrounding effect", which is the central concept of a previous work, is in the inner part of this new GR. But in most of the cases the 2 assumptions predictions are the same. And GR lagrangian in vacuum remains a fundamental equation common to the 2 assumptions. A direct result is that a surrounding effect arises in gravitation and this gives an explanation to the gravitational issues of today. And under a second assumption which is a unifying one, it explains also the Millenium Yang-Mills problem.

Speaker: Frederic Lassiaille

Newton_speed.avi

Newton_struct.avi

RelativityInMotion.pdf

SMT_speed.avi

SMT_struct.avi

Surrounding matters.pdf

11 Superfluids and local gravitational field

We discuss the possible coupling between a superfluid and the local gravitational field. After introducing a quantum-gravity theoretical framework to describe the supercondensate-graviton coupling, we exploit an effective theory for generalized Maxwell-type fields to analyze quantum effects originating from the proposed interplay.

From an experimental point of view, it had been shown that generalized electric-type fields can be induced in (super)conductors by the presence of the Earth’s weak gravitational field. These observations led to the theoretical, formal introduction of an effective modified electric-type field, determining detectable corrections to the free fall of charged particles.
The above remarkable experimental results can be combined to the theoretical weak-field gravity formulation, leading to a more general definition of new, generalized electromagnetic fields. The latter feature a component defined in terms of the weak gravitational perturbations, and satisfy a specific set of equations that can be put in a form closely analogous to Maxwell's equations.
The latter symmetry is then exploited to analyse the gravity/supercondensate interplay, the new generalized fields being involved in quantum effects originating from the interaction with the weak gravitational background (in analogy to what happens for gravity-induced electric fields in superconductors).
In particular, the emerging formal symmetry allows to use the Ginzburg–Landau model for the description of the physics, resulting in a mean-field theory for the system's thermodynamics, including the effects of thermal fluctuations. We then quantitatively analyse how the local gravitational field could couple to the superfluid condensate in a superconductor, making use of the time-dependent Ginzburg–Landau equations in the regime of fluctuations.

Speaker: Dr ANTONIO GALLERATI (Polytechnic of Turin, DISAT Department, Italy)

Talk.pdf

Tuesday 6 December

Public outreach

11:30 Coffee Break

Public outreach

14:00 Lunch Break

Public outreach: Journalists

Wednesday 7 December

12 Dark matter and Gravitational Effects

List item

            **Dark matter and Gravitational Effects**

Author: Swapnil K Singh
BMS College of Engineering, Bull Temple Rd, Basavanagudi, Bengaluru, Karnataka, India 560019
(Email ID: swapnil.me21@bmsce.ac.in)

The nature of dark matter (DM) is currently one of the most intriguing questions of fundamental physics. Yet, its existence is still debated, and relies on the observations of gravitational effects in large-scale structures and in cosmology. One of the most striking types of evidence of unexpected gravitational effects come from galaxies, and in particular spiral galaxies. In spiral galaxies, most of the visible mass is gathered in the budge and the disc. Using the Gauss’ theorem, the velocity of stars v at the distance R from the galactic centre reads
v(R)=√((GM(R))/R)
As a consequence, the velocity is expected to decrease as v(R) ∝ R^(1/2) most of spiral galaxies however the observed velocity far from the centre is approximately constant.
The most striking cases are the ones of strong gravitational lensing of distant galaxies behind a galaxy cluster, which appear under the form of several distorted images spread on the so-called Einstein circle. The angular radius of the Einstein circle is related to the mass which gave rise to light deflection through the formula.
∅_E= √(4GM/c^2 ((D_s-D_l))/(D_s D_L ))

Gravitational lensing is therefore often used to weigh galaxy clusters, and numerous studies are consistent and tend to demonstrate that the visible mass represents only 10-20% of the total mass, similarly to the commonly found result in galaxies.

In the early universe when Matter starts gathering via gravitational collapse in the denser regions, forming large-scale structures in which galaxies also emerge. Two main effects which affected the structure formations are gravitational interaction attracts matter in the centres of masses, and the expansion of the Universe drives structures away from each other. the interplay between expansion and gravity and study the role of dark matter in this process is very important. Thus, there are various computer simulations which we run to visualise the formation of the universe. The standard cosmological model ΛCDM shows a remarkable agreement with all the observations from disparate scales. Finally, the combined results of are consistent with the large-scale structure data, and reveal that the ratio of baryonic mass over total matter mass is close to 15%, which is in agreement with the results at galaxy and galaxy cluster scales.

Speaker: Swapnil Singh

Abstract_Dark matter and Gravitational Effects.docx

Dark Matter and Gravitational Effects_Swapnil in GPA 22.mp4

GPA 22, DM and Gravitational Effects.pdf

GPA 22, DM and Gravitational Effects.pptx

13 Separating the spectral counterparts in NGC 1275/Perseus cluster in X-rays

We are developing the optimal recipe to separate the spectral counterparts of the active galactic nucleus NGC 1275 and the Perseus cluster surrounding it in the spectra observed by Suzaku/XIS cameras. The key problem here is due to the fact that the emission of the cluster reaches the energies significantly higher than in the most cases of AGN even for those situated in the surroundings quite dense. Namely, the traces of the cluster medium emission can be traced in the soft-to-hard X-rays up to the level of 9-10 keV. That is why the separation of these two components: the AGN and the cluster, is especially important in this case. We prefer to avoid the usage of spectral fitting to perform this task due to huge quantity of fitting parameters necessary to describe all the components of this spectrum (i.e. abundances of elements the cluster consists of, thermal and Compton emission of the nucleus itself, and the jet SSC/IC emission spectral parameters as well) and as a result, the model degeneracy. Instead we use the spatial resolution of the components and double background subtracting. For this purpose we choose the following regions to collect all the photons from them: (1) circular region of the radius around the source (AGN); (2) ring-shape region surrounding the AGN (for cluster); (3) remote empty circular region for the background. Having collected the photons from those regions we subtract the background (i.e. photons from the third region) from the source and cluster spectra. On this stage one can see the emission line near 6.55 keV clearly visible in both the AGN and cluster spectra. Being emitted in the cluster this line can be used to estimate the quality of background subtracting on the second step. Namely, from the AGN spectrum we subtract the cluster counts normalized with the relation between the 6.55 keV emission line amplitudes in the AGN and cluster spectra. The absence of this line in the spectrum after the second background subtraction step can be considered as a criteria of the correctness of the procedure. We have performed this procedure to the whole set of the Suzaku/XIS observational data for NGC 1275 to obtain the cleaned spectra of the AGN in this system.

Speaker: Anatolii Tugay (Taras Shevchenko National University of Kyiv)

NGC1275.mp4

NGC1275.pdf

14 Gamma Ray Burst and Afterglow

Gamma-ray bursts (GRB’s), short and intense pulses of low-energy γ rays, have fascinated astronomers and astrophysicists since their unexpected discovery in the late sixties. GRB’s are accompanied by long-lasting afterglows, and that they are associated with core-collapse supernovae. The detection of delayed emission in X-ray, optical, and radio wavelength, or “afterglow,' following a γ-ray burst can be described as the emission of a relativistic shell decelerating upon collision with the interstellar medium.
Several hundred afterglows have now been observed across the electromagnetic spectrum. While it is fair to say that there is strong diversity amongst the afterglow population, probably reflecting a diversity in energy, luminosity, shock efficiency, baryon loading, progenitor properties, circumstellar medium and more, the afterglows of GRBs do appear more similar than the bursts themselves, and it is possible to identify common features within afterglows that lead to some canonical expectations. After an initial flash of gamma rays, a longer-lived "afterglow" is usually emitted at longer wavelengths (X-ray, ultraviolet, optical, infrared, microwave and radio). It is a slowly fading emission at longer wavelengths created by collisions between the burst ejecta and interstellar gas.
In X-ray wavelengths, the GRB afterglow fades quickly at first, then transitions to a less-steep drop-off (it does other stuff after that, but we’ll ignore that for now). During these early phases, the X-ray afterglow has a spectrum that looks like a power law. This kind of spectrum is characteristic of synchrotron emission, which is produced when charged particles spiral around magnetic field lines at close to the speed of light
In addition to the outgoing forward shock that ploughs into the interstellar medium, there is also a so-called reverse shock, which propagates backward through the ejecta. In many ways” reverse” shock can be misleading, this shock is still moving outward from the rest frame of the star at relativistic velocity, but is ploughing backward through the ejecta in their frame, and is slowing the expansion. This reverse shock can be dynamically important, as it can carry comparable energy to the forward shock.

In the early phases of the GRB afterglow still provides a good description even if the GRB is highly collimated since the individual emitting regions of the outflow are not in causal contact at large angles, and so behave as though they are expanding isotropically, If the emission from the GRB itself is confined into a relativistic jet with some half opening angle ∅𝑗, then the true burst energy is not that observed by a GRB detector, but is modified by the fraction of the sky illuminated by the jet. This is only strictly true for a so-called top hat jet, where the energy per solid angle is the same for any observer, but is commonly assumed.
In this case, the correction from the measured energy of the burst 𝐸𝑖𝑠𝑜 to its true Energy.

At early times, individual elements within the relativistic outflow are not in causal contact, since they experience time dilation. However, the jet is slowing as it ploughs into the medium and the evolution of the Lorentz factor

The majority of afterglows, at times typically observed, fall in the slow cooling regime and the cooling break lies between the optical and the X-ray. Numerous observations support this broad picture for afterglows.
In the spectral energy distribution of the afterglow of the very bright GRB. The bluer light (optical and X-ray) appears to follow a typical synchrotron forward shock expectation (note that the apparent features in the X-ray and optical spectrum are due to the presence of dust within the host galaxy).
Gamma ray bursts are among the most energetic phenomena in the universe, we still don’t fully understand the physical processes that drive them.
Science from studies of GRBs is now important across the bulk of astronomy, and even beyond fundamental physics. GRBs have been used to provide stringent limits on quantum gravity effects through differing speeds of light at different energies; have been proposed to explain mass extinction events in the geological history of the Earth; have progenitors for short bursts that may create the majority of heavy elements throughout the Universe; are successfully used to probe the physical conditions in the early Universe; provide a route to mapping the build-up of stellar mass and metals across cosmic history; provide unique constraints on the processes of particle acceleration and the production of ultra- high energy cosmic rays and neutrinos; probe the stellar evolution of the most massive stars and have been demonstrated as route to enabling multi messenger astronomy.

Speaker: Swapnil Singh

Abstract_Gamma Ray Burst and Afterglow.pdf

15 The Informal Spread of Light Around Nebula

This research paper is about the informal (symmetric/asymmetric) distribution of light around nebulas, which also provides us a brief on how and on what factors the shape of the structure depends upon. This research work is conducted by observing and using different image sets as well as sonification of the observed images to get a better and concrete result for the research work. At the end of the research, we will observe the reasons for several types of nebulae to be asymmetric or symmetric.

Speakers: Mr Nishant Yadav, Mr Suryansh Saxena

11:30 Coffee Break

16 Two-body freefall time in a matter dominant expanding universe

Predicting freefall time is a major problem in galactic dynamics. The relaxation time of collisionless dark matter, which heavily influences galaxy evolution, is closely related to its freefall time. Calculating freefall time using Kepler’s Third Law does not consider the effects of the universe’s expansion. This paper proposes a new formula for calculating freefall time in an expanding background. The derivation of the formula starts from the governing equations of an N-body system in an expanding background. Two-body simulations were run using equations of motion with constant damping (to represent the effects of expansion) derived from the N-body equations. More than 5,200 different two-body systems with different separation distances, mass, and damping were simulated. The simulated freefall time was compared with good agreement against the proposed formula. The results demonstrate that two-body freefall time is dependent on the time at which collapse began. The earlier it began, the longer the freefall time. A weak gravitational attraction, caused by the small mass of the system or the great distances involved, exacerbates this effect. The galaxy that started to form earlier is expected to take longer to form. A better understanding of freefall time can lead to greater insight into galaxies’ historical and future evolution.

Speaker: Sean Xu

17 The detection of gravitational waves new approach

The gravitational waves appear as wave solution for the Einstein’s equations of General Relativity. They were predicted by Einstein in 1916. These ripples of space time are generated by the punctual acceleration of matter in the Universe. The existence of gravitational waves was confirmed by the study of the Binary Pulsar PSR 1913+16 in 1980s. The first experimental discovery was on September 14, 2015, by the collaboration LIGO-Virgo, staging the fusion of two black holes. After a theoretical and historical description of the actual scientific research, we will propose a new detection method that is based on the presence of an electromagnetic field via several examples of applications.

Speaker: Ms Sarra Garah (Faculty of exact sciences, university of tebessa)

garah sarra.docx

18 Radiative Corrections to the Direct Detection Process of Higgsino-like Dark Matter

In the R-parity conserving Minimal Supersymmetric Standard Model (MSSM)
the Lightest Supersymmetric Particle (LSP) is a well-motivated dark matter (DM) candidate.
From the perspective of naturalness, light Higgsino-like neutralino states are favored and have been studied widely in the literature. In this presentation, we focus on the direct detection prospects for light higgsino-like neutralino DM. In particular, we have studied certain classes of one-loop radiative corrections to the spin-independent direct detection cross-section, which contributes significantly to the same. This is especially so in the parameter space where (almost) pure higgsino is the LSP, thanks to its suppressed coupling with the Higgs bosons.
Further, we comment on the implications for the mu parameter in light of recent data from spin-independent direct detection.

Speaker: Syed adil Pasha (Shiv Nadar University, Greater Noida)

13:30 Lunch Break

19 Eikonal quasinormal modes and photon orbits of deformed Schwarzschild black holes

The geometric optics approximation provides an interpretation for eikonal correspondence that, in black-hole-containing spacetimes, connects high-frequency black hole quasinormal modes with closed photon orbits around said black hole. This correspondence has been identified explicitly for several GR black holes, violation of which can be a potential hint toward physics beyond GR. However, the identification of the correspondence seems largely relies on specific symmetries of the spacetimes that correspond to the separability of equations. One naturally asks how the eikonal correspondence would appear if the spacetime is less symmetric. In this talk, we consider a deformed Schwarzschild spacetime retaining only axisymmetry and stationarity. We show that up to the first order of spacetime deformations, the eikonal correspondence manifests through the definition of the averaged radius of trapped photon orbits along their one period. This averaged radius overlaps the potential peak in the master wave equation, which can be defined up to the first order of spacetime deformations, allowing the explicit identification of the eikonal correspondence. The talk is based on arXiv:2205.02433.

Speaker: Che-Yu Chen (Institute of Physics, Academia Sinica)

paraBHeikonal220116.pdf

20 Scalar Particles Creation by an External Electric Field in a Non-Commutative Space-time

The phenomenon of scalar particles creation in a non-commutative space-time when an electric field is present, is analyzed. Our purpose is to study the effect of the electric field on the creation of particles from vacuum. We have used the Bogoliubov transformation technique to calculate the number density of the spin-0 created particles in a non-commutative space-time , it is necessary to specify the asymptotic behavior of “ in “ and “ out “ vacuum states. This method based on the exact mode functions.
According to the formalism of Klein-Gordon equation in non-commutative space-time, We investigated the mechanism of particles production from the solutions which are in terms of special functions. The results have been interpreted.
The obtained results confirm the fact that particle creation is a property of curved space-time, Our aim in the future is to study the process of Dirac particles creation in non-commutative spaces.

Speaker: Hadjar Rezki

NC Bosons-abstract.docx

21 The Gravitational Memory Effect

In this dissertation we intend to study the background related to the memory effect that leads to "gravitational-wave memory effect" and two types of memory effect:(1) We intend to study a whole outline of what is memory effect.(2) We intend to solve the linear memory for N Gravitationally Unbound Particles where we will study different kinds of spherical harmonics,mass quadrapole leading to linear memory effect.\begin{equation}
\boxed{ {\Delta{h^{TT}{jk}}}=\triangle{{\sum{A=1}^{N}}}{\frac{4M_{A}}{r{\sqrt{1-v^{2}{A}}}}[\frac{v^{j}{A}v^{k}{A}}{1-{{v{A}.N}}}]^{TT}}}
\end{equation}(3)Then we try to examine the memory effect for the individual radiated neutrinos\cite{mukhopadhyay2021memory}
\begin{equation}
{h^{xx}{TT}}={h(r,t)}={\frac{2G}{rc^{4}}{\int^{t-r/c}{{-\infty}}}dt'L_{\nu}(t')}{\alpha(t')}
\end{equation}
(4) Then we will discuss briefly about the introduction of non linear memory effect.

Speaker: Ms DEESHANI MITRA (St Xavier's College(Autonomous),Kolkata)

THE_GRAV_WAVE_MEMORY_EFFECT_PRESENTATION (10).pdf

22 Recognizing of gravity waves from all-sky airglow images using machine learning over a complete solar cycle

To study atmospheric gravity waves, a large number of airglow images must be processed. In this work we present a program that was developed to recognizing gravity waves patterns in ASAI images. The recognizing procedure contains a classification model based on a convolutional neural network (CNN) and object detection models. Classification model selects clear nighttime images from all ASAI raw data picture. The object detection model locates the extent of the waveform. Then the wave parameters (horizontal wavelength, period, direction, etc.) can be calculated over the range of the wave sample, All data used in this paper based on 557.7-nm airglow images at shigaraki (SGK) (35°N, 136°E,2008-2019(24th solar cycle)), Japan.

Speaker: Mostafa Nasser (Helwan University)

Thursday 8 December

23 Searches for Dark Matter and Extra Dimensions with the ATLAS Experiment at the LHC

The presence of a non-baryonic Dark Matter (DM) component in the Universe is inferred from the observation of its gravitational interaction. If Dark Matter interacts weakly with the Standard Model (SM) it could be produced at the LHC. On the other hand, the existence of extra spatial dimensions could provide solutions to longstanding issues with the SM, such as the hierarchy problem, and enable the search for massive gravitons and microscopic black holes in colliders. The ATLAS Collaboration has developed a broad search program for DM candidates in final states with large missing transverse momentum produced in association with other SM particles (light and heavy quarks, photons, Z and H bosons, as well as additional heavy scalar particles) and searches where the Higgs boson provides a portal to Dark Matter, leading to invisible Higgs decays. ATLAS also has an array of searches looking for massive gravitons in leptonic, hadronic, and bosonic final states. The results of recent searches on 13 TeV pp data from the LHC, their interplay and interpretation will be presented.

Speaker: Monica Verducci (Universita & INFN Pisa (IT))

Cairo_Dec_2022_Verducci_withcorrection.pdf

24 Studying the Neutron Star Equation of State with the CBM Experiment at FAIR

The Nuclear Equation of State (EoS) at suprasaturation densities and its importance in determining Neutron Star properties has been the focus of several experimental and theoretical activities worldwide. This truely multi-messenger effort spans all the way from the nuclear theory calculations based on Chiral Effective Field Theory all the way to astrophysical measurements of the neutron stars and their collisions. Complementary information from Heavy-Ion Collisions (HIC) provide a means to study EoS inside the laboratory in controlled conditions, therefore represent another crucial source of information.

This contribution will give an overview of diverse sources of information that can be used to infer the properties of dense nuclear matter, namely nuclear theory, astrophysical data, and heavy-ion collisions. A special emphasis will be placed on HIC’s pivotal role in constraining the dense-matter EOS at around twice nuclear saturation density over the past two decades. Moreover, as an outlook, an introduction to the Compressed Baryonic Matter (CBM) experiment at the Facility for Antiproton and Ion Research (FAIR) will be given as it continues the HIC effort to higher densities, with the experiment expecting data-taking in 2028-29.

Speaker: Kshitij Agarwal (Eberhard Karls Universität Tübingen (DE))

20221208_Agarwal_GPA2022.pdf

25 Study on CMB dipole using COBE/FIRAS data set

Cosmology, as the name suggests, concerns the study of the origin, structure, laws, and ultimate fate of the universe on a very large scale. The origin of the universe and its evolution have always been the most sought-after information for us. To know how the universe came into existence, CMB is the most practical tool, or the only one, at least for now, available to us. CMB, the earliest light in the universe, is one of the most effective techniques for examining the physics of the cosmos. In recent years there has been a substantial shift towards the model formation, simulation and computational technique with a desire to contribute precise results by twining with the experimental satellite data.
The latest studies and observations on CMB impart that detected radiation is not from a solitary blackbody with a specific temperature but are radiations due to combination or mixture of blackbodies. This creates the distortion in the CMB spectrum namely µ and y distortion. Temperature and distortions of CMB are the crucial parameters for the investigation of the origin of the existing universe. As the CMB spectrum resembles a Planck spectrum we can analyse the probability distribution of temperature for CMB. One of the such techniques is blackbody radiation inversion.
In this research the technique of blackbody radiation inversion is applied to calculate the CMB temperature and its uncertainty from COBE/FIRAS dipole dataset. It is also found that the process is somehow similar to mixing of weighted blackbodies. The temperature and its spreading obtained from the distribution is 2.514 ± 0.555K. This spreading is larger than the estimated spreading (3.3 × 10-3 K) by considering relative motion. Deviation from gaussian behaviour is established by measuring skewness and kurtosis. The comparison between the probability distribution of temperature of monopole, dipole and their resultant are also done. The distribution is found to be asymmetrically oriented. Interpreting the spreading as the distortion we calculated the µ and y-distortions, and found to be in the order of 10-1 and 10-2 respectively. This research presents the very first mention of CMB dipole temperature and its spreading assuming the mixing of black bodies.

Speaker: SOMITA DHAL (BIRLA INSTITUTE OF TECHNOLOGY, MESRA, RANCHI)

abstarct_somita.docx

26 Real Time Ultrasoft Scalars Self Energy at Next to-leading order in Hot Scalar QED

In a series of works, we have used the imaginary time formalism to study the infrared behavior of the gluon and quark damping rates [1, 2, 3, 4, 5, 6, 7]. The results have indicated that there are difficulties in the infrared sector. A similar observation has been done in the context of scalar electrodynamics [8]. To look further into the infrared behavior, we propose to calculate the next-to-leading order dispersion relations for slow-moving Scalars at high temperature scalar quantum electrodynamics (Scalar QED), using the real time formalism (RTF) in physical representation. We derive the analytic expressions of hard thermal loop (HTL) contributions to propagators and vertices to determine the expressions of the effective propagators and vertices in RTF that contribute to the complete next-to leading order contribution of retarded scalars self-energy. The real part and the opposite of the imaginary part of the retarded scalars self-energy are related to the next-to-leading order contributions of energy and damping rate respectively.

[1]. A. Abada, O. Azi and K. Benchallal, Phys. Lett.B425, 158-164 (1998).
[2]. A. Abada, O. Azi, Phys. Lett.B463, 117-125 (1999).
[3]. A. Abada, K. Bouakaz and O. Azi, Phys. Scr. 74, 77-103 (2006).
[4]. A. Abada, K. Bouakaz and N. Daira-Aifa, Eur. Phys. J.C18, 765-777 (2001).
[5]. A. Abada, N. Daira Aifa and K. Bouakaz, Int.J.Mod.Phys.A21, 5317-5332 ( 2006).
[6]. K. Bouakaz, A. Abada, AIP Conf.Proc.1006:150-153, (2008).
[7]. A. Abada, K. Bouakaz and D. Deghiche, Mod.Phys.Lett.A22, 903-914 (2007).
[8]. A. Abada and K. Bouakaz, JHEP01, 161-187 (2006).

Speaker: Dr Karima Bouakaz (ENS-KOUBA)

bouakaz20221.doc

11:30 Coffee Break

27 Energy spectrum for elementary particles

This is an unified theory by using an energy model to explain mass, called the energy spectrum. To explain this theory, a multidimensional concept will be projected on plots. The energy spectrum model can explain from quantum level to universe level physic behaviors.

Speaker: Boyu Chen (HsinChu Science Part)

Energy spectrum for elementary particles_final.pdf

Energy spectrum for elementary particles.pdf

Energy spectrum for elementary particles_presentation.pdf

28 jet substructure techniques with the production of Z+jet at the LHC

Jet substructure techniques have an important role in high-energy collider physics computations of the hard processes. In this poster, we present the study of the production of a Z-boson plus one jet from pp collision .We show an analytical computation of the jet mass observable at leading order and next to leading order, implementing the trimming technique. As a consequence, after applying the clustering algorithm we note the contribution of the clustering logs and non-global logs that should be taken into consideration. Moreover, we shed light on preliminary results from the Monte Carlo event generators madgraph and pythia8 for the case of NLO computation. We compare the analytical part with the simulated one and use Rivet to analyze the resulting hepmc file .

Speaker: Safa Gaid (University of Batna (Algeria))

29 On the resummation of non-global and clustering logarithms for jet shapes beyond the leading log accuracy

The azimuthal decorrelation ΔΦ for dijet production in e+e− annihilation, is a typical example of a jet shape distribution that promise to provide valuable information on perturbative and non-perturbative QCD dynamics. Where the jets are nearly back to back, the observable in question is sensitive to soft emissions, giving rise to large single logarithms. Employing the four vector recombination scheme (E− scheme), used at the Tevatron, the observale at hand is non-global. One of the main complications that arise in such observables particularly at next to leading logarithmic (NLL) accuracy, are twofold. On the one side, non-global logarithms will arise in the jet shape distribution when the jets are defined using both the kt and anti−kt clustering procedures. On the other side new logarithmic contributions, clustering logs in the independent emission piece will show up at the said logarithmic accuracy, when the kt clustering algorithm is applied. In this work we shed light on these very contributions for the aforementioned observable and we analytically compute the full R dependence of non-global and clustering logarithms for various jet algorithms at fourth order in the perturbative expansion. Employing the small jet radius approximation, we also perform an analytical fixed order calculation of non-global logarithms with kt clustering algorithm up to two-loops in the coupling.

Speaker: Hana Benslama (Batna1)

30 The possible quantization of Riemann curvature tensor on 3-Sphere

With the minimum measurable length uncertainty emerged from the relativistic generalized uncertainty principle in curved spacetime and the generalization of the pseudo-Riemannian manifold to eight-dimensional tangent bundle, the fundamental tensor is conformally modified to accommodate quantum-mechanical, geometric, and gravitational imprints, especially in the relativistic regime. In this talk, I shall be presenting the possible quantization of the Riemann curvature tensor on 3-sphere.

Speaker: Abdel Nasser Tawfik (Future University in Egypt (FUE))

Friday 9 December

31 Towards a Learning Based Error Mitigation Method for Simulating Quantum Fields

Noise poses a practical challenge to quantum computation on NISQ devices Earlier attempts to simulate quantum fields on a quantum computer have all utilized error mitigation to extract meaningful results as it would not be possible otherwise. Usually, the mitigation technique is Zero Noise Extrapolation (ZNE) but recent results have proved a large difference in error reduction between ZNE and Learning based error mitigation techniques. Here, we investigate whether these recent developments can improve the simulation of the dynamics of Quantum Fields on Quantum Computers. In particular, we explore variable noise Clifford Data Regression vnCDR using the error mitigation technique. We report that indeed, learning based error mitigation improves the simulation of Quantum Fileds on Quantum Computers.

Speaker: Mr Chinonso Onah (Ludwig Maximillian University, Munich)

Gravitational Physics Conference.pdf

32 On Possible Minimal Length Deformation of Metric Tensor and Affine Connection

When the minimal length approach emerges from noncommutative Heisenberg
algebra, generalized uncertainty principle (GUP), and thereby integrating gravitational fields to this fundamental theory of quantum mechanics (QM) is thoughtfully extended to Einstein field equations, the possible deformation of the metric tensor could be suggested. This is a complementary term combining the effects of QM and general relativity (GR) and comprising noncommutative algebra together with maximal spacelike four–acceleration. This deformation compiles with GR as curvature in relativistic eight–dimensional spacetime tangent bundle, generalization of Riemannian spacetime, is the recipe applied to derive the deformed metric tensor. This dictates how the affine connection on the Riemannian manifold is straightforwardly deformed. We have discussed the symmetric property of the deformed metric tensor and affine connection. Also, we have evaluated the dependence of a parallel transported tangent vector on the spacelike four–acceleration given in units of $L$, where $L$, where $L=\sqrt {\dfrac{\hslash G}{c^3}}$ is a universal constant, c is the speed of light, and ℏ is Planck constant, and G is Newton’s gravitational constant.

Speaker: Dr Muhammad Maher (Physics Department, Faculty of Science, Helwan University.)

ListOfReferences.bib

On Possible Minimal Length Deformation of Metric Tensor and Affine Connection.pdf

On Possible Minimal Length Deformation of Metric Tensor and Affine Connection.tex

ParallelTransport2c.eps

33 Minimal Length Deformation of Spacetime Curvature

When generalized noncommutative Heisenberg algebra accommodating impacts of finite gravitational fields as specified by loop quantum gravity, doubly–special relativity, and string theory, for instance, is thoughtfully applied to the eight-dimensional manifold, the generalization of the Riemannian manifold. By constructing the deformed affine connections on a four-dimensional Riemannian manifold, we have determined the minimal length deformation of Riemann curvature tensor and its contractions, the Ricci curvature tensor, and Ricci scalar. Consequently, we have been able to construct the deformed Einstein tensor. As in Einstein’s classical theory of general relativity, we
have proved that the covariant derivative of the deformed Einstein tensor vanishes, as well. We conclude that the minimal length correction suggests a correction to the spacetime curvature like the additional curvature terms in corrected Riemann tensor, and its contractions. Accordingly, the spacetime curvature endows additional curvature and geometrical structure

Speaker: Dr Muhammad Maher (Physics Department, Faculty of Science, Helwan University.)

Abstract - Minimal Length Deformation of Spacetime Curvature.pdf