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02/07/2025, 08:50Talk
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Christian Fischer (University of Giessen, Germany)02/07/2025, 09:05Dense QCDTalk
Converging results from different approaches locate the critical end point (CEP) of QCD at large chemical potential, i.e. in the realm of dense QCD. We summarise recent theoretical results within functional methods on the location of the CEP and its variation under systematic changes of the light and strange quark masses. We furthermore discuss the physics at large chemical potential including...
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Ludovica Pirelli (Bergische Universität Wuppertal)02/07/2025, 09:50Phase diagram and critical behaviour in QCD/QFTTalk
The QCD cross-over line in the temperature (T) - baryo-chemical
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potential ($\mu_{B}$) plane has been computed by several lattice
groups by calculating the chiral order parameter and its susceptibility
at finite values of $\mu_{B}$ . In this work we extract from the
peak position of the static quark entropy ($S_{Q}(T,\mu_{B})$) in
T, which is based on the renormalized Polyakov loop. This... -
Prof. Francesco Giacosa (Kielce University)02/07/2025, 10:10Phase diagram and critical behaviour in QCD/QFTTalk
First, the importance of the chiral anomaly in the QCD vacuum is briefly reviewed. Besides pseudoscalar mesons, it may affect other resonances. To this end, a mathematical object called `polydeterminant' is introduced. Next, the role of the chiral anomaly at nonzero temperature is investigated. In particular, the Columbia plot (the order of the phase transition in dependence of the quark...
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Agnieszka Sorensen (Facility for Rare Isotope Beams)02/07/2025, 11:00Phase diagram and critical behaviour in QCD/QFTTalk
We explore the validity of finite-size scaling of net-proton number cumulants as a tool to search for evidence of a critical point in the QCD phase diagram. We show that in central Au+Au collisions at $\sqrt{s_{\rm{NN}}} = 7.7$ GeV and above, the second cumulant C2 as a function of rapidity bin width follows a power-law consistent with scale invariance. We then show that for any bin width, C2...
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Tomas Mari Surkau02/07/2025, 11:20Phase diagram and critical behaviour in QCD/QFTTalk
We propose an observable to probe the content of a bath of quarks and gluons at finite temperature and chemical potential, the net quark number gain $\Delta Q$. QCD is controlled by different degrees of freedom in the various sections of its phase diagram, notably hadrons at low temperatures (and chemical potentials) and quarks and gluons at high temperatures. However, studying the relevant...
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Kei Tohme (Kyoto University)02/07/2025, 11:40Lattice QCDTalk
We investigate the thermodynamics of heavy-quark QCD in the hopping-parameter expansion (HPE) in an analytic manner. We develop a procedure to calculate the grand potential of heavy-quark QCD in the HPE using a technique based on the cumulant expansion. Applying this method to the analysis of thermodynamics, we derive the formula for the grand potential expressed in terms of the cumulants of...
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Víctor López Pardo02/07/2025, 12:00Correlations, bound states and hadron spectroscopyTalk
The high-precision heavy quarkonium data from LHC Run 2 and the ongoing Run 3 provide a unique window into the properties of hot nuclear matter and the Quark-Gluon Plasma (QGP). To make full use of this data, it is crucial to go beyond traditional observables such as the nuclear modification factor $R_{AA}$ and elliptic flow $v_2$, and instead develop new probes that are more directly...
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ME Carrington (Brandon University)02/07/2025, 12:20Correlations, bound states and hadron spectroscopyTalk
We calculate the leading and subleading corrections to the real-time static potential in a high-temperature quark-gluon plasma for distances smaller than the screening length. The calculation involves one-loop 2- and 4- point functions in the hard-thermal-loop effective theory. We use our results to estimate the binding energy, the decay width, and the dissociation temperature of the...
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Andreas Schmitt (University of Southampton)02/07/2025, 14:30Dense QCDTalk
Cold and dense QCD matter may break rotational invariance spontaneously. One candidate phase is the chiral density wave, which exhibits an anisotropic chiral condensate, and which is conjectured to occur in the vicinity of the quark-hadron transition. I will employ a nucleon-meson model that allows for a chiral phase transition to explore the possibility of a chiral density wave in nuclear...
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Geraint Evans (Academia Sinica)02/07/2025, 15:15Dense QCDTalk
Including the effects of the chiral anomaly in Chiral Perturbation Theory at finite baryon chemical potential, it has been shown that neutral pions form an inhomogeneous phase dubbed the "Chiral Soliton Lattice" (CSL) above a certain critical magnetic field. Above a second, even higher critical field, the CSL becomes unstable to fluctuations of charged pions, implying they condense.
I will...
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Mr Samapan Bhadury (Jagiellonian University)02/07/2025, 15:35OtherTalk
Analyzing the connections between the spin density matrix and the Wigner function for spin-half particles, we propose a new form of the local equilibrium Wigner function that solves the long-standing problem related to normalization of mean spin polarization. Interestingly, this new proposal for the local equilibrium Wigner function coincides with the recently developed generalized...
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Loïc Fernandez (Helsinki Institute of Physics, University of Helsinki)02/07/2025, 16:30Dense QCDTalk
We will discuss the recent developments in renormalization group improvements of the cold and dense QCD pressure (Phys. Rev. D 111, 034020 and Phys. Rev. Lett. 129, 212001) at next-to-next-to leading order (NNLO) through the renormalization group optimized perturbation theory (RGOPT) and at all-order resummation of the soft modes. RGOPT applied for the very first time at NNLO displayed a...
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Prof. Jens Oluf Andersen02/07/2025, 16:50Dense QCDTalk
In this talk I will discuss QCD at finite isospin density at zero temperature and zero baryon density. This is system is of particular interest since there is no sign problem and one can perform lattice simulations. I will present results for the speed of sound from NLO chiral perturbation theory (chipt) and the quark-meson model in the Bose-condensed phase. The latter is able is in good...
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Pracheta Singha (west university of Timisoara)02/07/2025, 17:10Phase diagram and critical behaviour in QCD/QFTTalk
The experimental observation of the spin polarisation of the outgoing hadrons in non-central heavy ion collisions implies the existence of a strongly vortical QGP medium with finite spin density. We consider the effect of finite spin density on the QCD phase diagram using the Linear Sigma model coupled to quarks (LSMq). In our approach, we introduce the finite spin density via a quark spin...
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Noriyuki Sogabe (University of Illinois Chicago)02/07/2025, 17:30Dense QCDTalk
We explore the interplay between Berry curvature and topological properties in single-flavor color superconductors, where quarks form spin-one Cooper pairs. By deriving a new relation, we connect the topological nodal structure of the gap function in momentum space to the (non-Abelian) Berry flux associated with paired quarks. This generalizes the early work by Li and Haldane [1] to systems...
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Prof. Ariel Zhitnitsky (UBC)02/07/2025, 17:50Nuclear astrophysicsTalk
We discuss the dynamics of the topologically nontrivial sectors with non-trivial holonomy in strongly coupled QCD in the background of the expanding universe characterized by the Hubble scale $H\ll \Lambda_{QCD}$. We argue that the vacuum energy and the de Sitter phase emerge dynamically with the scale $\rho_{DE}\approx H\Lambda_{QCD}^3 \approx (10^{-3} eV)^4$, which is amazingly...
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Sanjay Reddy (University of Washington)03/07/2025, 09:00Nuclear astrophysicsTalk
The QCD axion, originally proposed nearly five decades ago as a solution to the strong CP problem, remains one of the most compelling dark matter candidates. In this talk, I will explore the possibility that axions may undergo Bose-Einstein condensation in the dense cores of neutron stars, where extreme baryon densities could facilitate such a phase. Employing Chiral Perturbation Theory in...
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José Luis Hernández (Institut de Ciències de l'Espai, Institut d'Estudis Espacials de Catalunya (IEEC))03/07/2025, 09:45Nuclear astrophysicsTalk
In the coalescence of neutron stars the bulk viscous dissipation offers a potential opportunity to infer properties of neutron star matter by estimating its effect on the gravitational wave emission. To this end, we compute the bulk viscosity in unpaired quark matter considering the electroweak processes allowed in the neutrino-transparent regime at low temperatures. Using the equations of...
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Pranjal Tambe (Inter-University Centre for Astronomy and Astrophysics)03/07/2025, 10:05Nuclear astrophysicsTalk
Isospin-equilibrating weak processes, called ``Urca" processes, are of fundamental importance in astrophysical environments like proto-neutron stars, neutron star mergers, and supernovae. In these environments, matter can reach high temperatures of tens of MeVs and be subject to large magnetic fields. We thus investigate Urca processes at different temperatures and field strengths by...
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Christoph Gärtlein (IST, University of Lisbon / University of Coimbra / University of Wroclaw), Dr Violetta Sagun (University of Southampton)03/07/2025, 11:00Nuclear astrophysicsTalk
We study rotating hybrid stars, with a particular emphasis on the effect of a deconfinement phase transition on their properties at high spin. Our analysis is based on a hybrid equation of state with a phase transition from hypernuclear matter to color-superconducting quark matter, where both phases are described within a relativistic density functional approach. By varying the vector meson...
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19. Exploring Color-Superconducting Phases in Hybrid Star Models Using an RG-Consistent NJL ApproachDr Ishfaq Ahmad Rather (Institute for Theoretical Physics, Goethe University, 60438 Frankfurt am Main, Germany)03/07/2025, 11:20Nuclear astrophysicsTalk
We present a comprehensive investigation of color-superconducting phases in compact stars using the renormalization group-consistent Nambu–Jona-Lasinio (RG-NJL) model [1]. By systematically varying vector and diquark coupling constants, we analyze their effects on the equation of state, speed of sound, and resulting mass-radius relations. Our models demonstrate that stable color-flavor-locked...
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Mirco Guerrini (University of Ferrara and INFN Ferrara)03/07/2025, 11:40Nuclear astrophysicsTalk
An intriguing hypothesis states that ordinary hadronic matter in bulk is a metastable state (i.e., a local minimum) of strongly interacting matter, while strange quark matter (SQM) is absolutely stable (i.e., the global minimum) in bulk. A potential barrier that prevents a spontaneous deconfinement transition of ordinary hadronic matter into SQM would separate these two phases.
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Our work aims... -
Bernd-Jochen Schaefer03/07/2025, 12:00Dense QCDTalk
We investigate color superconductivity in two-flavor QCD and its impact on the equation of state for dense matter in neutron stars. Employing a quark-meson-diquark model truncation within the functional renormalization group framework, we analyze the formation of diquark and chiral condensates and characterize the resulting superconducting phase at high baryon densities.
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Our results provide... -
Aleksi Vuorinen (University of Helsinki)03/07/2025, 12:20Dense QCDTalk
Different parts of neutron stars (NSs) probe all fundemantal interactions of particle physics: the strong nuclear force is behind the bulk thermodynamic properties of their constituent matter, electroweak interactions are needed to describe equilibration and transport phenomena during binary NS mergers, and information on QED scattering processes at ultrastrong magnetic fields is required to...
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Matthias Kaminski03/07/2025, 16:15Non-equilibrium dynamics/non-equilibrium aspects of QCDTalk
The plasma generated in heavy ion collisions goes through different phases in its time evolution. While early times right after the collision are governed by far-from equilibrium dynamics, later times are believed to be well described by near-equilibrium dynamics. While these regimes of nonequilibrium are complicated to describe within QCD, effective descriptions such as hydrodynamics provide...
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Eduardo Garnacho Velasco03/07/2025, 17:00Lattice QCDTalk
In this talk, we present a study of the out-of-equilibrium CME conductivity via Kubo formulas using lattice QCD simulations. We present an analytic study of the CME Kubo formula in 1-loop perturbation theory, which sheds light on the nature of the CME in a system of non-interacting fermions. We then determine the Euclidean correlator as a function of the (imaginary) time using full dynamical...
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Francois Gelis03/07/2025, 17:20Non-equilibrium dynamics/non-equilibrium aspects of QCDTalk
An important question in heavy-ion collisions is how the initial far-from-equilibrium medium evolves and thermalizes while it undergoes a rapid longitudinal expansion. In this presentation, I will show how to use the two-particle irreducible (2PI) effective action to address this question, focusing on phi^4 scalar theory truncated at three loops. I will present numerical results for quantities...
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Stanislaw Mrowczynski03/07/2025, 17:40Fluid dynamics and collectivityTalk
At the earliest stage of ultrarelativistic heavy-ion collisions the produced matter is a highly populated system of gluons called glasma which can be approximately described in terms of classical chromodynamic fields. Although the system's dynamics is governed by Yang-Mills equations, glasma evolution is shown to strongly resemble hydrodynamic behavior. We discuss glasma collective flow and we...
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Moulindu Kundu (West University of Timisoara)03/07/2025, 18:00
Dileptons are considered to be an important observable, in the context of studying the characteristics of the deconfined phase of quark gluon plasma (QGP). Historically, the dilepton production rates (DPR) from the QGP have been studied using two different approaches. In the quantum field theory (QFT) approach, the DPR is expressed in terms of the thermal expectation value of the...
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Mr Stefanos Tsiopelas (University of Wrocław)03/07/2025, 18:00
We study the bulk viscosity of moderately hot and dense, neutrino-transparent colour superconducting quark matter arising from weak-interaction-driven direct URCA processes. The quark matter is modeled using the Nambu-Jona-Lasinio model extended to include both vector interactions and the 't Hooft determinant term. The superconducting phase is described by using the two-flavour red-green...
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Dan Zhang03/07/2025, 18:00
We present a lattice QCD study of light pseudoscalar meson masses and decay constants in strong background magnetic fields, using three different lattice sizes. Our simulations employ (2+1)-flavor ensembles using the highly improved staggered quark (HISQ) action with physical quark masses and three values of the lattice spacing ($a \approx$ 0.067, 0.084, 0.112 fm) to enable a controlled...
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Prof. ANGEL GOMEZ NICOLA (Universidad Complutense Madrid)03/07/2025, 18:00
We review recent progress towards the understanding of the QCD phase diagram using tools based on effective theories, Ward Identities (WI) and resonances at finite temperature and chemical potentials.
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Various relevant observables such as scalar and topological susceptibilities can be obtained within this framework and are consistent with recent lattice analyses. In particular, we show... -
Mathias Pavely Nødtvedt (NTNU)03/07/2025, 18:00
In this talk I will discuss the three-flavor quark-meson model including color superconductivity, with emphasis on the 2SC and CFL phases. We extend the quark-meson model to the quark meson diquark model. This is a renormalizable low energy effective model that describes the superconductive phases of QCD. We calculate the thermodynamic potential including quark loops. We map out the phase...
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Christoph Gärtlein (IST, University of Lisbon / University of Coimbra / University of Wroclaw)03/07/2025, 18:00
We explore the role of color superconductivity in quarkyonic matter under the conditions of electric and charge neutrality at β-equilibrium, as relevant for neutron stars. By explicitly incorporating color-superconducting pairing gap into the phenomenological model of a crossover transition from hadron to quark matter, we extend the known quarkyonic framework suggested by McLerran and Reddy to...
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Manpreet Kaur (Dr. B R Ambedkar National Institute of Technology Jalandhar (144008), Punjab, India)03/07/2025, 18:00
We present the in-medium mass modification of $D$ ($D^+$, $D^0$) and $\bar D$ ($D^-$, $\bar {D^0}$) mesons when immersed in isospin asymmetric $\Delta$ resonance matter by using the chiral SU(3) hadronic model extended to the SU(4) sector.
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The interactions of $D$ and $\bar D$ mesons with decuplet baryons ($\Delta^{++,+,0,-}$) are explicitly taken into account in the dispersion relations in... -
Antonio Smecca (Swansea University)03/07/2025, 18:00
In this talk I will present a new method to study the QCD phase diagram at finite baryon chemical potential, using hadronic correlators. Specifically, the approach exploits the degeneracy between the vector and axial vector channels upon chiral symmetry restoration. The temperature at which this degeneracy occurs shifts as $\mu_B$ is increased, allowing us to follow the change of $T_{c}$ along...
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Shi Yin (Institute for Theoretical Physics, Justus Liebig University Giessen)03/07/2025, 18:00
Dense QCD matter can feature a moat regime, where the static energy of mesons is minimal at nonzero momentum. We elucidate various features of this regime in this work. To capture the main effects, we use a two-flavor quark-meson model and put forward an efficient renormalization scheme to account for the nontrivial momentum dependence of meson self-energies in the moat regime.
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We show that... -
LUCA PASSARELLA03/07/2025, 18:00
We analyze the finite-temperature equation of state (EOS) within the framework of an effective Lagrangian, where a dilaton field encodes the breaking of scale invariance in QCD. The present work extends a previous study in the pure gauge SU (3)c sector [1], in which the dynamics of the gluon condensate are described through a dilaton Lagrangian. Below the critical temperature, the condensate...
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Ms Udita Shukla (University of Wroclaw)03/07/2025, 18:00
We present an improved ansatz for the self-energy of confined quarks within a density functional formalism in order to investigate the thermodynamics of dense matter, particularly, the speed of sound and baryon fluctuations, including studying their approach toward the conformal limit. The formulation offers insight into how characteristic scales inherent to a theory lead to mimicking...
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Sudip Kumar Kar03/07/2025, 18:00
At present, our understanding of the non-equilibrium aspects of a relativistic spin fluid is derived from the study of Wigner function coupled with the semiclassical expansion. In our work, we present an exact computation (up to quantum loop corrections) of the Wigner functions for quarks in a field of oscillating pion condensate. The oscillating pion condensate enters the equation of motion...
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Mr Shyam Kumar (Universita e INFN, Bari (IT))03/07/2025, 18:00
Fragmentation functions are fundamental components of the factorization approach which is used to calculate the production cross sections of heavy-flavor hadrons within QCD. Due to their non-perturbative nature, they cannot be computed a priori and are typically extracted from measurements in clean environments such as electron-positron (e$^+$e$^-$) or electron-proton (e$^-$p) collisions....
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Dr Rupam Samanta (Institute of Nuclear Physics (IFJ, PAN), Poland)03/07/2025, 18:00
We study the magnetic properties of the Hadron Resonance Gas (HRG) (which is created in ultra-relativistic heavy-ion collisions or studied on the lattice) in the presence of a constant magnetic field. Instead of the simplified approach$^{1,2}$ of taking the gyromagnetic ratio of a hadron as $g=2|Q|$, we consider the physical value of $g$ as measured in experiments or estimated theoretically....
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Dr Amaresh Jaiswal (National Institute of Science Education and Research)03/07/2025, 18:00
We investigate the rotational Brownian motion of heavy quarks in a QCD medium and present predictions for the polarization of open heavy-flavor hadrons. Specifically, we derive expressions for vector and tensor polarization, which correspond to baryon spin polarization and meson spin alignment, respectively. Furthermore, we suggest that the transverse momentum dependence of heavy quark...
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Eduardo Fraga (Instituto de Física, Universidade Federal do Rio de Janeiro)03/07/2025, 18:00
We compute the pressure, chiral condensate and strange quark number susceptibility from first principles within perturbative QCD at finite temperature and very high magnetic fields up to two-loop and physical quark masses. We also discuss cold and dense quark matter in the presence of a very strong magnetic field using perturbative QCD at finite density. The effectively negligible contribution...
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Dr Alexander Ayriyan (University of Wroclaw & AANL)03/07/2025, 18:00
We perform a Bayesian analysis of the equation of state (EOS) constraints using recent observational data, including pulsar masses, radii, and tidal deformabilities. Our focus is on a class of hybrid neutron star EOS that incorporates color superconducting quark matter, based on a recently developed nonlocal chiral quark model. The nuclear matter phase is described using a relativistic density...
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Natalia Łygan (Jagiellonian University)03/07/2025, 18:00
A recently formulated extension of perfect spin hydrodynamics, which includes second-order corrections in the spin polarization tensor to the energy-momentum tensor and baryon current, is studied in the case of a one-dimensional boost-invariant expansion. The presence of second-order corrections introduces feedback from spin dynamics on the hydrodynamic background, constraining possible spin...
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mahboubeh shahrbaf motlagh (University of Wroclaw)03/07/2025, 18:00
The extraordinary densities achieved in the cores of neutron stars make them ideal astrophysical laboratories for investigating hypernuclear matter. Recent multi-messenger observations impose stringent constraints on the neutron star equation of state, allowing for tests of models that incorporate exotic components such as hyperons. For example, precise measurements of neutron star masses—such...
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Mr Davood Rafiei Karkevandi (University of Wroclaw, Institute of Theoretical Physics)03/07/2025, 18:00
We study neutron stars (NSs) admixed with self-interacting bosonic dark matter (DM), motivated by recent observational data from NICER and LIGO/Virgo. In this framework, sub-GeV bosonic DM can accumulate as a dense core or form an extended halo around the NS, significantly affecting its mass, radius, and tidal deformability. By varying the DM particle mass, self-coupling strength, and its...
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Hadi Mehrabpour (Peking Univresity)03/07/2025, 18:00
The encoded nuclear structures related to flow fluctuations can be investigated at a fixed impact parameter in ultra-relativistic ion collisions through the concept of factorization breaking. This phenomenon is explored by analyzing momentum-dependent correlations among flow harmonics across distinct kinematic bins, specifically in terms of pseudorapidity ($\eta$)[1] or transverse momentum...
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Jana N. Guenther (University of Wuppertal)03/07/2025, 18:00
We employ lattice simulations to search for the critical point of quantum chromodynamics (QCD). We search for the onset of a first order QCD transition on the phase diagram by following contours of constant observables (e.g. entropy density) from imaginary to real chemical potentials under conditions of strangeness neutrality. We scan the phase diagram and investigate whether these contours...
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Lutz Kiefer (Goethe University Frankfurt)03/07/2025, 18:00
Rotation is known to restore chiral symmetry at high angular velocities, but it is also expected that rotation can induce an axial-vector condensate. This condensate, often overlooked, can significantly alter the behavior of the chiral condensate, potentially enhancing it under rapid rotation. To investigate this interplay, we compute the phase diagram of the chiral and axial vector...
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Pavel Buividovich03/07/2025, 18:00
First-principle lattice QCD studies of the Chiral Magnetic Effect (CME) have so far been mostly carried out in a thermal equilibrium state with background magnetic field and an artificial "chiral chemical potential". In this case, Bloch theorem prohibits any nonvanishing conserved currents in equilibrium, and the CME current vanishes identically.
In this talk, I introduce a novel formalism...
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Pietro Rescigno (University of Milano-Bicocca, INFN Milano-Bicocca)03/07/2025, 18:00
The predictions of QCD at temperatures ranging from 1 GeV up to 160 GeV have recently become accessible from first-principles, non-perturbative lattice simulations owing to a novel computational strategy. Among the quantities that are being investigated in the ongoing program, hadronic screening masses - i.e. inverse correlation lengths - offer crucial insight into the properties of the QCD...
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Mattis Harhoff (Universität Bielefeld)03/07/2025, 18:00
Stochastic hydrodynamics provides a dynamical framework for the evolution of fluctuations in heavy-ion collisions. Due to the small volume of the system, thermal fluctuations can become sizeable and probe the equation of state of the system, being particularly sensitive to a possible QCD critical endpoint.
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Our present numerical setup can simulate stochastic non-relativistic hydrodynamics in a... -
Dr Rajeev Singh (West University of Timisoara, Romania)03/07/2025, 18:00
In this talk, I will present our latest research building upon the findings of PLB 850 (2024) 138533, which demonstrated that the entropy current can be derived from first principles using the quantum statistical method, bypassing the need for assumed traditional local thermodynamic forms. Our study uncovers that the local thermodynamic relations, which have been conventionally used as...
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Panayiotis Panayiotou (Technical University of Munich)03/07/2025, 18:00
Heavy quarkonium serves as an excellent probe to study the properties of the Quark-Gluon Plasma (QGP). The physics of quarkonium created in heavy-ion collisions is intrinsically connected to the correlation functions of adjoint chromoelectric fields in quantum chromodynamics. Such correlation functions are vital in determining transport coefficients that govern the evolution of heavy...
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David Blaschke03/07/2025, 18:00Poster
We review the role of primordial black holes (PBHs) for illuminating the dark ages of the cosmological evolution and as dark matter candidates. We elucidate the role of phase transitions for primordial black hole formation in the early Universe and focus our attention to the cosmological QCD phase transition within a recent microscopical model. We explore the impact of physics beyond the...
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Dr Violetta Sagun (University of Southampton)03/07/2025, 18:00
We study the impact of asymmetric fermionic and bosonic dark matter on neutron star properties, including tidal deformability, maximum masses, radii, thermal evolution, moment of inertia, etc. The conditions under which dark matter particles tend to condense in the core of the star or create an extended halo are presented. We show that dark matter condensed in a core leads to a decrease of the...
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Mr Abhisek Saha (Peking University)03/07/2025, 18:00
We investigate the influence of nuclear structure on transverse spherocity ($S_0$) distributions in $^{238}U+^{238}U$ collisions at $\sqrt{S_{NN}}=193$ GeV. The initial spatial anisotropy of colliding nuclei is expected to imprint distinct signatures on final-state event topology. Hydrodynamic evolution translates these initial geometric anisotropies into momentum-space correlation via...
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Dr David Edwin Alvarez Castillo (Institute of Nuclear Physics PAS)03/07/2025, 18:00
By consideration of the Compact object HESS J1731-347 as a hybrid twin compact star, i.e., a more compact star than its hadronic twin of the same mass, its stellar properties are derived. Besides showing that the properties of compact stars in this work are in good agreement with state-of-the-art constraints both from measurements carried out in laboratory experiments as well as by...
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Pablo Navarrete (University of Helsinki)03/07/2025, 18:00
Major progress has been made in recent years toward computing the four-loop perturbative pressure of cold and dense quark matter (QM) [1,2], a key ingredient in constraining the equation of state of neutron-star matter. What remains to be computed is the contribution from hard-momentum gluons in dense QCD, encoded in the sum of 52 four-loop vacuum Feynman diagrams at finite baryon chemical...
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Semyon Potesnov (Institute for Theoretical Physics, Goethe-University Frankfurt)03/07/2025, 18:00
Employing a kinetic framework, we calculate all transport coefficients for relativistic dissipative (second-order) hydrodynamics for arbitrary particle masses in the 14-moment approximation. Taking the non-relativistic limit, it is shown that the relativistic theory reduces to the Grad equations computed in the “order-of-magnitude” approach.
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Pavlo Panasiuk03/07/2025, 18:00
While symmetric nuclear matter has been studied in laboratories, neutron star matter is characterized by high asymmetry. Therefore, by examining the strongly interacting matter properties in a wide range of densities and isospin asymmetry we confront two regimes to understand how the enforced electric neutrality and beta equilibrium alter the onset density of quark matter. Particularly, we...
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Mamiya Kawaguchi03/07/2025, 18:00
Recent studies suggest that the presence of a peak structure in the sound velocity would be essential for reproducing the observed mass-radius relation of neutron stars. To investigate the existence of the sound velocity peak in baryonic dense matter, the chemical potential dependence of the sound velocity has recently been evaluated via lattice simulations of two-color QCD, rather than...
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Zbigniew Drogosz (Jagiellonian University)03/07/2025, 18:00
We propose a hybrid approach, which may help to establish consistency between different formulations of spin hydrodynamics. The perfect fluid is described in the framework of kinetic theory of particles with spin 1/2 following the Fermi-Dirac statistics. The baryon number, energy, linear momentum, the spin part of angular momentum, as well as entropy are conserved, although in the presence of...
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Prof. Gert Aarts (Swansea University)03/07/2025, 18:00
Diffusion models are currently one of the leading generative AI approaches for image generation used by e.g. DALL-E and Stable Diffusion. A formulation familiar to physicists uses stochastic differential equations. We review this formulation and relate it to stochastic quantisation in quantum field theory. We demonstrate the approach for scalar and abelian gauge fields in two dimensions and...
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Daniel Battistini (Technische Universität München (DE))03/07/2025, 18:00
In the last years, several exotic states have been observed in the charm sector; such particles cannot be interpreted as baryons or mesons and are thought to be either quark bags or molecular states. To unveil the nature of those states, it is crucial to experimentally constrain the strong force that governs the interaction between the charmed hadrons and other hadrons, e.g. via the...
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Justin Mauldin (Frankfurt University)03/07/2025, 18:00
In this work, we calculate the phase diagram of the (2+1)-dimensional Gross-Neveu-Yukawa (GNY) model under strong magnetic fields at finite temperature and density. Large magnetic fields result in magnetic catalysis, a dimensional reduction of the system and enhancement of the chiral symmetry breaking. Using the functional renormalization group (FRG) in a hydrodynamic approach allows us to...
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Johannes Pöplau03/07/2025, 18:00
We use the functional renormalization group in the local potential approximation, with the full effective potential, to investigate the quark meson model for the presence of inhomogenious phases. To this end, we solve the flow equation for the bosonic two point function, to investigate if the two point function shows a negative wave function renormalization or even a zero...
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Arthur Vereijken (UJK Jan Kochanowski University Kielce)03/07/2025, 18:00
The $\psi(3686)$ is identified as the radial excitation of the $J/\psi$. Based on perturbative QCD, the branching ratio of the $\psi(3686)$ into some final hadron state should be approximately 13\% of the branching ratio of the $J/\psi$ to that same hadron final state. This is called the "13\% rule". However, certain decay channels such as the $\rho\pi$ severely violate this 13\% rule. Using...
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Kevin Zambello (University of Pisa and INFN, Sezione di Pisa)03/07/2025, 18:00
We explore the phase diagram of 8 flavor QCD by lattice simulations, using a stout improved staggered fermion action and a tree-level Symanzik improved gauge action. At small masses we observe an intermediate phase between the strong coupling and the weak coupling phases, aligning with results from previous studies. We also investigate the effect of adding an imaginary chemical potential.
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Mr Dhananjay Singh (National Institute of Technology Jalandhar)03/07/2025, 18:00
We investigate the transport properties of quark matter under conditions of momentum anisotropy using the Polyakov chiral quark mean-field (PCQMF) model. Momentum anisotropy naturally arises in systems out of equilibrium, such as the early stages of relativistic heavy-ion collisions or the interior of compact stars. Understanding the impact of such anisotropy on transport coefficients is...
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Ilia Grishmanovskii (ITP, Frankfurt)03/07/2025, 18:00
An understanding of the properties of the quark-gluon plasma (QGP) is important for the interpretation of experimental data on the bulk observables, as well as on jet and heavy-quark attenuation in heavy-ion collisions. However, gaining this knowledge is a challenging task, since it pertains to the non-perturbative regime of QCD, for which only limited information from lattice QCD is currently...
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Dr Sabarnya Mitra (Bielefeld University)03/07/2025, 18:00
The chiral phase transition in (2+1)-flavor QCD is expected to be of second order, if the breaking of axial anomaly remains sufficiently strong at the chiral phase transition temperature $T_c$ [1]. This observation is supported by the lattice QCD calculations [2]. However, the FRG model calculations suggest that the scaling window may be small [3], within which the universal scaling relations...
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Yehor Bondar (Jan Kochanowski University (PL))03/07/2025, 18:00
The observation of significant Λ hyperon transverse polarization, i.e. the polarization in the direction transverse to the Λ production plane, in inclusive p+p and p+A collisions using unpolarized beams triggered theoretical efforts to describe this effect. Numerous models have been proposed to explain the origin of hyperon polarization. Several models have successfully explained the behavior...
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Sipaz Sharma (Technische Universitat Munchen)04/07/2025, 09:00Lattice QCDTalk
In recent years, lattice QCD calculations have significantly advanced our understanding of the QCD phase diagram at finite temperature and baryon density. In this talk, I will discuss the QCD equation of state at finite baryon chemical potential, with particular emphasis on the Taylor expansion method used to extend lattice results to nonzero chemical potentials. I will highlight the role of...
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Yusuke Shimada (U Tokyo)04/07/2025, 09:45Phase diagram and critical behaviour in QCD/QFTTalk
In this talk, I will report our recent achievements based on ref. [1].
Quark-Hadron Continuity on QCD and Gauge-Higgs model
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A big puzzle of QCD and its phase diagram is whether quark matter at high density and hadronic matter are smoothly connected or separated by the phase transition. On the one hand, since both phases have the same symmetry, the continuity between hadrons and quark... -
Jon-Ivar Skullerud04/07/2025, 10:05Lattice QCDTalk
The FASTSUM collaboration has a long-standing programme of using
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anisotropic lattice QCD to investigate strong interaction
thermodynamics, and in particular spectral quantities. Here we
present first results from our new ensemble which has a temporal
lattice spacing $a_\tau=15$ am and anisotropy $a_s/a_\tau=7$, giving
unprecedented resolution in the temporal direction. We show... -
Etsuko Itou04/07/2025, 11:00Lattice QCDTalk
We investigate the equation of state (EoS) of two-color QCD at low temperature and high density using lattice Monte Carlo simulations. Our results show that the speed of sound exceeds the relativistic limit (c^2_s/c^2= 1/3) after the BEC–BCS crossover in the superfluid phase. We also discuss the temperature dependence of the EoS within the superfluid phase. This talk is based on...
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Volodymyr Chelnokov (Institut für Theoretische Physik, Goethe Universität)04/07/2025, 11:20Lattice QCDTalk
We present a study of the structure of the chromoelectrical field created by a static quark-antiquark pair in lattice QCD with 2+1 flavours of dynamical quarks, where the quark masses are set to their physical values. The analysis covers a wide range of temperatures both above and below the chiral crossover, and explores varying quark-antiquark distances, with the aim of identifying signals of...
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18. Topological observables and $\theta$ dependence in high temperature QCD from lattice simulationsAndrey Kotov04/07/2025, 11:40Lattice QCDTalk
We discuss topology in Quantum Chromodynamics at high temperatures $T~\gtrsim~180$ MeV obtained from lattice simulations. Our setup consists of $N_f=2+1+1$ Wilson twisted mass fermions with physical quark masses and results are extrapolated to the continuum limit. We compare the results for the topological susceptibility obtained with the field-theoretic definition with those obtained from an...
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Matteo Bresciani04/07/2025, 12:00Lattice QCDTalk
The Equation of State of Quantum Chromodynamics with $N_f=3$ flavours is determined non-perturbatively with a precision of about 0.5%-1.0% in the range of temperatures between 3 GeV and 165 GeV. The computation is carried out by means of numerical simulations of the gauge theory discretized on the lattice. At each given temperature the entropy density is computed at several lattice spacings in...
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Arpith Kumar (Central China Normal University)04/07/2025, 12:20Lattice QCDTalk
Strong magnetic fields, attaining magnitudes comparable to the QCD scale, can significantly affect the equilibrium properties and bulk thermodynamics of strongly interacting matter. While such strong fields are expected in off-central heavy-ion collisions, directly measuring their imprints, such as chiral magnetic effects, remains challenging.
In this talk, we propose the baryon-electric...
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David Blaschke04/07/2025, 12:40Talk
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Dr Leonardo Tinti (Uniwersytet Jana Kochanowskiego w Kielcach)04/07/2025, 14:30Fluid dynamics and collectivityTalk
Relativistic hydrodynamics is the covariant generalization of a classical (non-relativistic, non-quantum) model. Recent developments in the field can explain how it is possible for relativistic hydrodynamics to be predictive in a very small system, in which quantum effects like diffraction and discrete (rather than continuous) spin states are not suppressed. This can be particularly...
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Arjun Srinivasan Kudinoor (Massachusetts Institute of Technology)04/07/2025, 15:15Phenomenology & ExperimentTalk
We begin by using Hybrid Model calculations to reproduce experimental results published by ATLAS in 2023 on $R_{AA}$ for $R=1$ jets in Pb+Pb collisions. These jets are identified by first reconstructing anti-$k_t$ $R=0.2$ subjets and then re-clustering them. Following ATLAS, we investigate how $R_{AA}$ for these jets depends on the angle between the two subjets involved in the final clustering...
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Aritra Bandyopadhyay04/07/2025, 15:35QCD in external fieldsTalk
Dilepton emissions represent a key probe for characterising the Quark-Gluon Plasma (QGP). A central role in computing dilepton yields is played by the imaginary part of the electromagnetic current-current correlation, or equivalently, of the photon polarisation tensor [1]. In this work, we investigate the influence of local acceleration on dilepton production. We compute this quantity in a...
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Dr Rajeev Singh (West University of Timisoara, Romania)04/07/2025, 16:30Dense QCDTalk
We build upon the recently formulated guiding-center kinetic theory for guiding-center plasma by incorporating spin degrees of freedom in the presence of electromagnetic fields. This approach yields a streamlined set of equations for guiding-center ideal hydrodynamics with spin--fewer than those in traditional spin hydrodynamics--owing to a restriction on motion perpendicular to the magnetic...
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Ashutosh Dash04/07/2025, 16:50Fluid dynamics and collectivityTalk
We present BHAC-QGP, a numerical framework for simulating the evolution of quark-gluon plasma (QGP) in relativistic heavy-ion collisions under strong magnetic fields. Based on the general-relativistic magnetohydrodynamics code BHAC, originally developed for astrophysical applications, BHAC-QGP incorporates finite electrical conductivity and uses Adaptive Mesh Refinement (AMR) to capture QGP...
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Navid Abbasi04/07/2025, 17:10Fluid dynamics and collectivityTalk
The search for the QCD critical point in heavy-ion collisions requires the inclusion of fluctuations in hydrodynamic simulations of Quark-Gluon Plasma (QGP). Schwinger-Keldysh Effective Field Theory (SK-EFT) systematically incorporates these fluctuations, extending beyond classical hydrodynamics, which accounts only for dissipation. After a brief review of SK-EFT, we discuss how linear...
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Clemens Werthmann (Ghent University)04/07/2025, 17:30Fluid dynamics and collectivityTalk
Hydrodynamic attractors were first studied in conformal Bjorken flow in the context of heavy ion collisions to discuss how the fireball of strongly interacting matter approaches hydrodynamic behaviour. Recently, a hydrodynamic attractor has also been constructed for the case of ultracold atom gases, meaning it now has a second real world application and may soon be measured directly in...
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