In this lecture I shall introduce some basic notions needed for quantum information theory including qubits, density matrices, entanglement, quantum logic gates, basic quantum algorithms. The lecture will assume familiarity with basic quantum mechanics.
In this lecture I shall introduce some basic applications of quantum information ideas such as quantum key distributions (QKD), Bell's theorem, and NMR as basic quantum processors.
The last few years have seen the birth of in multi-messenger astronomy. Two prominent publications initiated the field: the first described the concurrent discovery of gravitational waves (GW170817) and a gamma-ray burst (GRB 170817A) linked to the binary neutron star merger event; the second claimed the association of the blazar TXS 0506+056 as the source of extremely-high-energy neutrinos...
We review neutrino oscillations from the theoretical and experimental points of view, by analysing how neutrino oscillations have been proposed, how we measured them and what is the current status.
Some comments on the absolute neutrino mass scale and mass ordering are also proposed.
We discuss mostly the standard three-neutrino case, and shortly introduce the case of light sterile neutrinos.
After a short introduction on cosmology, we discuss how neutrinos affect the expansion of the universse in different epochs, by analysing their impact on early- and late-time observables and how we can use cosmological measurements to constrain neutrino properties.
Neutrino decoupling, Big Bang nucleosynthesis, Cosmic Microwave Background and related constraints are presented.
Terrestrial and solar neutrino experiments have a variety of anomalous data that has resisted clarification. Recently, it has appeared that measurements of neutrinos from intense sources on gallium have passed 5σ and other hints from MicroBooNE and elsewhere remain interesting. I will present the latest update of these anomalies. I will then explain the primary reasons why these cannot be...
The Standard Model is widely accepted as one of the most successful predictive theories of Physics, providing insight into the fundamental building blocks of the universe. Over the last few decades this model has shown signs of incompleteness, most of which are attributed to Neutrinos. Within the confines of the standard model a discrepancy exists related to vanishing Neutrino masses, which...
Gamma-Ray Bursts (GRBs) have been detected to very high redshift (z = 9.4) which make them interesting cosmological probes. In attempts to use GRBs as cosmological standard candles, like Type-Ia supernovae (SNe), many studies have been conducted throughout in recent decades. These studies explore different phenomenological relations, such as the Amati and Yonetoku correlations between the GRB...
The detection of Gravitational Waves (GWs) allows the study of massive binary systems that may or may not have any electromagnetic (EM) emission. The joint detection of GW~170817 and the Gamma Ray Burst (GRB) GRB~170817A, marked the beginning of GW multi-messenger astronomy. It presented the potential to reveal new insights into the emission mechanisms of GRBs as well as a more accurate...
These two pedagogical lectures are aimed to bring attendees up to date with the basic concepts and key results in current theoretical and observational cosmology. The focus is on building physical understanding and making links to modern observations where possible.
The lectures shall begin with an overview of the accelerating universe model (LCDM), from the Big Bang and Inflation to the...
These two pedagogical lectures are aimed to bring attendees up to date with the basic concepts and key results in current theoretical and observational cosmology. The focus is on building physical understanding and making links to modern observations where possible.
The lectures shall begin with an overview of the accelerating universe model (LCDM), from the Big Bang and Inflation to the...
In this lecture, I will briefly overview the standard cosmological model and highlight some of its outstanding problems. I will then suggest potential candidates to alleviate the problems, and ways to observationally constrain them using astrophysical data.
Over the past decades, various researchers have indirectly predicted over a dozen super-Chandrasekhar white dwarfs (white dwarfs which violate the Chandrasekhar mass-limit) from the luminosity observations of peculiar over-luminous type Ia supernovae. Similarly recent gravitational wave observations showed the possibility of existence of massive neutron stars. In my presentation, I will...
Studies on the rest frame 21 cm spectral emission line of neutral hydrogen (HI; from the hyperfine spin-flip state transition) provides an interesting and novel way of studying the large-scale structure (LLS), baryon acoustic oscillations (BAO), cosmological models and galaxy dynamics and evolution. By modelling the distribution function of HI within dark matter halos and, consequently, the...
In this work, we will present the preliminary work on statistical detection of kSZ effect using Aperture Photometry. We use DESI cluster galaxy catalogue that follows in Boss-North and D56 ACTPOL region to measure kSZ effect.
In this short presentation, I will discuss about the research work regarding f(R,T) gravity and solutions under various functional form of f(R,T) for Godel universe.
In this talk, I shall present a novel class of non-Schwarzschild asymptotically flat metrics in exact closed analytical form for pure $R^2$ gravity (Phys. Rev. D 106 (2022) 10, 104004). They were recently derived from a program originated by Buchdahl in 1962. I shall also discuss the existence of Morris-Thorne-Buchdahl wormholes using the metrics.
Most of the matter in the universe is thought to be a form of dark energy, which makes up about 70% of all matter in the universe, 25% of dark matter, and 5% of ordinary matter such as planets and stars. Since it was discovered around 1998, researchers have been trying to determine the nature of this dark energy. Despite many efforts, there is still no good explanation for this. Two possible...
In this presentation is mainly devoted to the extended theory of Einstein’s gravity, particularly focused on the modified teleparallel gravity theory to explore different cosmological interests beyond the standard model of cosmology. The accelerating expansion of the universe, the linear cosmological perturbations and the inflationary Universe in modified teleparallel gravity theory will be...
Quantum Complexity has emerged in the past few years as a candidate for quantum chaos diagnostic. This talk is based on a work that appeared last year, in which we show that a notion of quantum complexity (spread complexity) is sensitive to Topological Phase Transitions - at least for the prototypical Kitaev chain. I'll give a brief overview of what we mean when we say "quantum" chaos and...
The cosmological scalar perturbations of standard matter are investigated in the context of extended teleparallel $f(T)$ gravity theories using the $1+3$ covariant formalism. After a review of the background gravitational field equations of $f(T)$ gravity and the introduction of the covariant perturbation variables, the usual scalar and harmonic decomposition have been performed, and the...
