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Jorge Noronha8/26/24, 9:00 AMTalk
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Fabian Rennecke (JLU Giessen)8/26/24, 9:45 AMTalk
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Aleksi Vuorinen (University of Helsinki)8/26/24, 11:00 AM
The postmerger dynamics of binary neutron-star merger events is known to be sensitive not only to the equation of state of the constituent matter, but also to its transport properties. A quantity of particular importance here is the bulk viscosity, which arises in a subtle interplay between the strong and electroweak interactions. In this talk, I will review a recent determination of the bulk...
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Eduardo Fraga (Universidade Federal do Rio de Janeiro)8/26/24, 11:25 AM
The phase transition from hadronic to quark matter may take place already during the early post-bounce stage of core collapse supernovae and in neutron star mergers. If the phase transition is of first order, the formation of the quark matter phase occurs via the nucleation of droplets. The timescales relevant for the phase conversion dynamics, as well as the possibility of mixed phases, are...
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Clemens Werthmann (University of Wroclaw)8/26/24, 11:50 AM
Exploiting the first measurements of the same ion species in O+O collisons at RHIC and LHC, we propose an experimentally accessible observable to distinguish whether collective behavior builds up through a hydrodynamic expansion of a strongly interacting QGP or through few final state rescatterings. Our procedure allows to disentangle the effects of the initial state geometry and the dynamical...
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Adrien Florio8/26/24, 2:00 PMTalk
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Carlota Andres (LIP, Lisbon)8/26/24, 2:45 PMTalk
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Fabian Zhou (ITP Heidelberg)8/26/24, 4:00 PM
We study the energy deposition and thermalisation of high-momentum on-shell partons (minijets) travelling through a non-equilibrium Quark-Gluon Plasma using QCD kinetic theory. For thermal backgrounds, we show that the parton energy first flows to the soft sector by collinear cascade and then isotropises via elastic scatterings. In contrast, the momentum deposition from a minijet reaches the...
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Florian Lindenbauer (TU Wien)8/26/24, 4:25 PM
Jet quenching measurements may provide an experimental opportunity to infer non-equilibrium properties of the quark-gluon plasma created in heavy-ion collisions. An important medium parameter determining the strength of jet-medium interactions is the jet quenching parameter $\hat q$. In this talk, I will present our results for this jet quenching parameter $\hat q$ in the initial...
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Xin An (National Center for Nuclear Research)8/26/24, 4:50 PM
The rapid longitudinal expansion characteristic of heavy-ion collisions leads to universal attractor behavior of the resulting drop of Quark-Gluon Plasma. Assuming approximate boost invariance, we incorporate transverse dynamics and parton evolution by linearizing the Israel-Stewart theory around the attractor. This yields a system of coupled ordinary differential equations which describe the...
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Jorinde van de Vis (Leiden Univerisity)8/27/24, 9:00 AMTalk
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Oliver Gould (University of Nottingham)8/27/24, 9:45 AMTalk
The prospect of gravitational wave detectors observing the remnant signal of a cosmological phase transition has inspired a flurry of developments in their theoretical description. Automating these developments is needed to improve predictions for phenomenological studies of BSM models. In this talk, I will describe some key theoretical developments and discuss progress and challenges for...
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Andreas Ekstedt (Uppsala University)8/27/24, 11:10 AM
With the approval of the space-based LISA experiment, the hunt is on: A search for gravitational-wave remnants of the Electroweak phase transition; to probe the Higgs potential and perchance even explain the Baryon asymmetry problem. Yet the theoretical hurdles are great—theoretical predictions can misjudge the peak gravitational-wave spectrum by orders of magnitude.
In this talk I will...
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Jingdong Shao (University of Chinese Academy of Sciences)8/27/24, 11:35 AM
We calculated the gravitational waves induced by different QCD phase transitions including in a chirality imbalanced system, in pure gluon system, in PQM, Qm, and Friedberg-Lee model, and the gravitaitional waves can be detected by LISA, Taiji and DECIGO. We find that the values of inverse duration $\beta/H$ of these QCD phase transitions are of order $10^4$ or $10^3$, which means the phase...
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Yuki Fujimoto8/27/24, 2:00 PMTalk
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Risto Paatelainen (University of Helsinki)8/27/24, 2:45 PMTalk
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Aleksi Kurkela (University of Stavanger)8/27/24, 4:00 PM
I discuss how astrophysical constraints on the dense-matter equation of state place an upper bound on the color-superconducting gap in dense matter above the transition from nuclear matter to quark matter. Pairing effects in the color-flavor locked (CFL) quark matter phase increase the pressure at high density, and if this effect is sufficiently large then the requirements of causality and...
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Tyler Gorda (Goethe University Frankfurt)8/27/24, 4:25 PM
Deconfined quark matter at asymptotically high densities is weakly coupled, due to the asymptotic freedom of QCD. In this weak-coupling regime, bulk thermodynamic properties of quark matter, assuming a trivial ground state, are currently known to partial next-to-next-to-next-to-leading order. However, the ground state at high densities is expected to be a color superconductor, in which the...
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Kinga Gawrych (Imperial College London)8/27/24, 5:00 PMPoster
Electroweak Theory (EWT) allows the existence of BNV processes mediated by topologically non-trivial field configurations. The most well-known such configuration is the instanton. However, due to the breaking of scale invariance by the Higgs mass, instantons are not allowed in EWT. Instead, one must use constrained instantons to obtain the BNV rate.
This poster will explain constrained...
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Reinhold Kaiser (University of Frankfurt)8/27/24, 5:02 PMPoster
The order of the thermal chiral phase transition in lattice QCD is strongly cutoff-dependent. A recent study from our group using mass-degenerate, unimproved staggered quarks on $N_\tau=\{4,6,8\}$ lattices found that the first-order regions shrink to zero for $N_\text{f}\in[2,6]$ as the continuum limit is approached for zero chemical potential. Here we present the progress of an analogous...
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Pavan Pavan (Bielefeld University)8/27/24, 5:04 PMPoster
The shear viscosity of the quark-gluon plasma (QGP) is important ingredient for describing current measurements in heavy-ion collisions and are key inputs to hydrodynamical models. The interest in shear viscosity also lies in the fact that QGP is the most ideal fluid ever observed and has the shear viscosity to entropy ratio ($\eta / s$) close to the theoretical bound $\eta / s \geq 1/ 4 \pi$...
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Dr Eamonn Weitz (Subatech, Nantes Université)8/27/24, 5:06 PMPoster
Jets play an important role in heavy-ion collisions, interacting with and thereby probing the quark-gluon plasma (QGP) as they propagate to the detector. The asymptotic mass, $m_{\infty}$ and the transverse scattering rate, $\mathcal{C}(k_{\perp})$ control this interaction insofar as they serve as input to calculations of transverse momentum broadening and medium-induced radiation. Both...
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Jan Philipp Klinger (Goethe University Frankfurt)8/27/24, 5:08 PMPoster
The nature of the QCD phase transition in the chiral limit constitutes a challenging problem for lattice QCD as it is not directly simulable. Its study, however, provides constraints on the phase diagram at the physical point. Recently, the thermal transition for massless fermions was shown to be of second order for all numbers of flavours $N_f \lesssim 7$. For this, the lattice chiral limit...
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Robin Kehr8/27/24, 5:10 PMPoster
In this work we probe the QCD Anderson transition by studying spectral distributions of the massless overlap operator on gauge configurations created by the twisted mass at finite temperature collaboration (tmfT) with 2+1+1 flavors of dynamical quarks and the Iwasaki gauge action. We assess finite-size and discretization effects by considering two different lattice spacings and several...
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Dr Wolfgang Unger (Deutsch)8/27/24, 5:12 PMPoster
The Hamiltonian formulation of lattice QCD based on an effective theory (the so-called dual formulation) can be extended in the strong coupling limit to two flavors. It has no sign problem at both non-zero baryon and isospin densities and allows for Quantum Monte Carlo simulations. We present results on the phase boundary for the chiral transition in the $\mu_B - \mu_I$ plane in the chiral...
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Johannes Roth (JLU Gießen)8/27/24, 5:14 PMPoster
In this talk, I will give an overview of the universal critical dynamics at the chiral phase transition of two-flavor QCD in the chiral limit. I will review the general argument about the dynamic universality class by explicitly constructing the stochastic equations of motion in the vicinity of the second-order phase transition. To extract dynamic universal quantities associated with these...
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Mathias Pavely Nødtvedt (NTNU (Norwegian University of Science and Technology))8/27/24, 5:16 PMPoster
We investigate the 2SC phase at medium baryon density using the quark-meson-diquark model. Our analysis involves calculating the thermodynamic potential in the mean field approximation to one fermion loop. The model includes the following effective degrees of freedom: the sigma, pions, quarks, and diquarks. Parameters are expressed with the physical values of the sigma mass, pion mass, and...
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Orestis Papadopoulos (University of Southampton)8/27/24, 5:18 PMPoster
Employing a phenomenological nucleon-meson model, we study the possible existence of a chiral density wave in neutron star matter. We impose charge neutrality and β-equilibrium, extending previous works that studied isospin-symmetric nuclear matter. We find that the chiral density wave is energetically preferred in a region of our parameter space that predict a very soft equation of state. In...
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Tomas Mari Surkau (CPHT (École Polytechnique, CNRS))8/27/24, 5:20 PMPoster
I will present perturbative results[1] on the confinement/deconfinement transition of Yang-Mills theories found in a center-symmetric Landau gauge with a Curci-Ferrari mass term to account for IR Gribov copies. We obtained one-loop predictions for the SU(2) and SU(3) transition temperatures close to lattice values. I will show that our results are consistent across different renormalization...
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Mr Jannis Gebhard (Institute for Theoretical Physics, Heidelberg University)8/27/24, 5:22 PMPoster
In this work, we perform computations of inclusive jet and semi-inclusive jet-hadron cross sections for minimum-bias oxygen-oxygen collisions. We compute the no-quenching baseline for the jet nuclear modification factor $R_{AA}$ and jet-, and hadron-triggered semi-inclusive nuclear modification factors $I_{AA}$. We do this with state-of-the-art nuclear parton distribution functions, NLO matrix...
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Paul Hotzy (TU Wien)8/27/24, 5:24 PM
The early stages of relativistic heavy-ion collisions involve a non-thermal gluonic plasma with high occupancy. We examine how the broad quasiparticle excitation characteristics found in an earlier study for such a 2+1 dimensional system affect the heavy quark diffusion coefficient. We show that essential transport properties can be extracted from gauge-fixed quantities, accurately reproducing...
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Sarah Louisa Pitz (Goethe Universität Frankfurt)8/27/24, 5:26 PM
Neutron stars with admixed dark matter enable new possibilities in the description of unusal mass and radius measurements, such as e.g. HESS J1731-347. We are including bosonic, self-interacting dark matter with a sufficiently stiff self-interaction potential in the form of $V \propto \phi^n$ and find that these neutron stars become ultra-compact ($C \geq 1/3$). They are compact enough to have...
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Marc Winstel (Goethe University Frankfurt)8/27/24, 5:28 PMPoster
In the intermediate density region of the QCD phase diagram, there have been conjectures about inhomogeneous, chiral phases, i.e., phases with translational symmetry breaking through the chiral condensate. A precursor phenomenon, the so-called Moat regime, where mesonic dispersion relations favor non-vanishing momenta, was found in a recent FRG study of the QCD phase diagram in the vicinity of...
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Osvaldo Ferreira Neto (Federal University of Rio de Janeiro and Goethe University)8/27/24, 5:30 PMPoster
In this work we calculate the electric and magnetic susceptibilities of a hot and dense medium in equilibrium up to order $\mathcal{O}(\frac{m^4}{T^4})$ $\mathcal{O}(\frac{m^2}{T^2})$, respectively. These susceptibilities are associated with $\mathcal{O}(k^2)$ terms (power corrections) of the photon polarization tensor, which are computed here for a hot and dense medium of fermions with a...
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Yannick Dengler (University of Graz)8/27/24, 5:32 PM
Analyzes of astrophysical data provide hints on the self-interactions of dark matter at low energies. Lattice calculations of strongly interacting dark matter (SIMP) theories are needed for motivating these models also from first principles. Sp(4) gauge theory with two fundamental fermions is a candidate SIMP theory. We compute the scattering phase shift for the scattering of two dark pions...
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Peter Lowdon (Goethe University Frankfurt)8/27/24, 5:34 PM
Perturbative approaches to quantum field theory at finite temperature require theoretical constraints to be addressed which are not present in the vacuum theory. In this talk I will present evidence from lattice simulations of massive $\phi^4$ theory which shows that the standard perturbative predictions break down, even at relatively low temperatures. This suggests that non-perturbative...
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Panayiotis Panayiotou (Technical University of Munich)8/27/24, 5:36 PM
Heavy-ion collisions are an essential tool to better understand the deconfined phase of Quark-Gluon Plasma . Probes such as heavy particles are used indirectly to study its properties. In describing the propagation of heavy particles in a medium, non-relativistic effective field theories are employed. In doing so, correlators of chromoelectric fields appear and are important in the evolution...
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Selina Kunkel8/27/24, 5:38 PMPoster
We study the minimal masses and radii of proto-neutron stars during different stages of their evolution.
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The main focus lies on the stages directly before the supernova explosion where neutrinos are captured in the core
and the lepton per baryon ratio is approximately $Y_L = 0.4$ and a few seconds after the supernova,
when all neutrinos have left the star.
All equations of state used for... -
Christoph Gärtlein8/27/24, 5:40 PMPoster
We study the properties of hybrid stars containing a color superconducting quark matter phase in their cores, which is described by the chirally symmetric formulation of the confining relativistic density functional approach [1]. It is shown that depending on the dimensionless vector and diquark couplings of quark matter, the characteristics of the deconfinement phase transition are varied,...
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Kirill Boguslavski (TU Wien)8/28/24, 9:00 AMTalk
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Harvey Meyer8/28/24, 9:45 AMTalk
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Jonas Turnwald (TU Darmstadt)8/28/24, 11:00 AM
The thermal photon rate is an import observable for understanding the quark-gluon plasma, and can be calculated from lattice QCD by reconstructing the spectral function of the vector current correlator. Since this correlator receives a large ultraviolet contribution from the vacuum, only the thermal part of the correlator is considered, which significantly simplifies the reconstruction. Since...
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Dibyendu Bala (Bielefeld University)8/28/24, 11:25 AM
Quarkonia, the bound states of heavy quark-antiquark pairs, have proven to be crucial probes for studying quark-gluon plasma (QGP). The color screening properties of the QGP weaken the interaction between quark-antiquark pairs, leading to the suppression of quarkonia yields within the QGP. We will present results on the fate of quarkonia bound states in the QGP by performing spectral...
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Pietro Rescigno (University of Milano-Bicocca, INFN Milano-Bicocca)8/28/24, 11:50 AM
Screening masses of states with nucleon quantum numbers are determined, for the first time, in QCD for temperatures ranging from $\sim 1$ GeV up to $\sim 160$ GeV. The non-perturbative data show that the bulk of the screening mass is given by the tree level value $3\pi T$, while interactions induce a $4 -8 \%$ positive deviation for all temperatures considered. While our results are compatible...
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Adrian Dumitru (Baruch College (CUNY))8/28/24, 2:00 PM
Exclusive C = +1 quarkonium production in high-energy electron-proton
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scattering requires a C-odd t-channel exchange of a photon or three
gluons. The relative phase of the amplitudes is determined by the sign
of the light-front matrix element of the eikonal color current
operator $d^{abc} J^{+a} J^{+b} J^{+c}$. Model calculations predict
constructive interference, which is particularly... -
Omar Elgedawy (South China Normal University)8/28/24, 2:25 PM
Jet quenching plays an important role as a hard probe to study properties of the quark–gluon plasma (QGP) in heavy-ion collisions at both the relativistic heavy-ion collider and the large hadron collider. During their travel in the QGP, high energy partons lose their energy mainly through splitting processes like bremsstrahlung and pair production, induced by elastic scatterings with the...
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Tom Magorsch (TUM)8/28/24, 2:50 PM
We present results for bottomonium suppression in the QGP based on pNRQCD and the open quantum system framework. We extend previous studies by including the three loop potential from pNRQCD, which provides a good prediction for the spin-averaged bottomonium spectrum. We solve the corresponding Lindblad equation for the quarkonium density matrix to obtain predictions for the nuclear...
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Rachel Steinhorst (Massachusetts Institute of Technology)8/28/24, 3:45 PM
The far-from equilibrium dynamics of the pre-hydrodynamic quark-gluon plasma (QGP) formed in heavy ion collisions can be characterized by distinct stages, during each of which the system loses some memory of its initial condition, until only the hydrodynamic modes remain. This attractor behavior has been characterized previously in both strongly and weakly coupled descriptions. In particular,...
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Thomas Schaefer (North Carolina State University)8/28/24, 4:10 PM
We describe numerical simulations of stochastic fluid dynamics
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with a conserved charge coupled to the momentum density of the
fluid. This theory is known as model H, and it is expected to
describe universal dynamics in the vicinity of a possible
critical endpoint in the QCD phase diagram. -
Pablo Navarrete (University of Helsinki)8/29/24, 9:00 AM
Due to its phenomenological relevance in heavy-ion collisions, cosmology and astrophysics, the determination of the QCD pressure - either at high temperature or large baryon density - has driven a number of important theoretical advances in perturbative thermal field theory applicable to equilibrium thermodynamics. In particular, the long-standing infrared problems that obstruct the...
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Jens Oluf Andersen8/29/24, 9:25 AM
In this talk, I will present some recent result for Bose condensation in two and three-flavor QCD using chiral perturbation theory (chipt). In the pion-condensed phase, we calculate the pressure, energy density, isospin density, and the speed of sound to next-to leading order in chipt. The results are compared with recent high-precision lattice data. The phase diagram in the mu_I-mu_S plane is...
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Gergely Fejos (Eötvös University Budapest)8/29/24, 9:50 AM
Based on the epsilon expansion of the renormalization group flows of the Ginzburg-Landau potential for the chiral phase transition of QCD, it has been widely accepted that it is of first order in the zero quark mass limit for N_f > 2, with the possibility of a second order transition for N_f = 2, given the axial anomaly remains strong enough at the critical point. Going beyond the perturbative...
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Andreas Schmitt8/29/24, 10:45 AM
Strongly interacting matter in large magnetic fields occurs in heavy-ion collisions and neutron stars and is of theoretical interest for the phase structure of QCD. It was previously found that a so-called Chiral Soliton Lattice is formed at sufficiently large magnetic fields and baryon chemical potentials due to the chiral anomaly. Using chiral perturbation theory and methods from ordinary...
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Savvas Pitsinigkos (University of Southampton)8/29/24, 11:10 AM
We employ a model based on nucleonic and mesonic degrees of freedom to describe cold and dense matter, in order to discuss the competition between isotropic and anisotropic phases, in the region of the chiral phase transition. Anisotropic phases have been extensively studied in quark models of dense matter, but equivalent progress was lacking in models using nucleonic degrees of freedom. When...
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pracheta singha (West University of Timisoara)8/29/24, 11:35 AM
We study the effect of rotation on the confining and chiral properties of QCD using the linear sigma model coupled to the Polyakov loop in an attempt to resolve discrepancies between the first-principle numerical and model-based analytical results. The attractive features of this model are renormalizability and the presence of the coupling between chiral and confining degrees of freedom.
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We... -
Owe Philipsen8/29/24, 1:30 PMTalk
Some information concerning the different excursions and lists of excursion participants
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Fabian Zierler (Swansea University)8/30/24, 9:00 AM
Field theories with symplectic gauge group are compelling candidates for composite physics extending the Standard Model. They are of interest for both composite Dark Matter and composite Higgs models and could give rise to first-order phase transitions in the early universe. With the aim of providing a robust non-perturbative characterisation of a model of potential phenomenological relevance,...
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Kari Rummukainen (University of Helsinki)8/30/24, 9:25 AM
SU($N$) pure gauge theories have a first order confinement-deconfinement phase transition when $N \ge 3$, and are prototype models for studying strongly coupled phase transitions. We use lattice simulations to determine the surface tension in SU($N$) gauge theory up to $N=16$. We observe that the surface tension $\sigma$ scales as $N^2$, and in the continuum limit can be described with...
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Killian Bouzoud (SUBATECH)8/30/24, 9:50 AM
The QCD axion has long been a subject of both theoretical and experimental interest due to being an elegant solution to the strong CP problem. It was also realized that axions can contribute significantly to the energy density of the Universe as dark radiation, that is a population of ultra-relativistic (or "hot") axions thermally produced in the early Universe by interacting with the Standard...
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Simona Procacci (U. Geneva)8/30/24, 10:45 AM
We consider a model, where a single inflaton interacts weakly as an axion with Yang-Mills gauge bosons. As these rapidly thermalize, the friction felt by the inflaton field is increased, leading to a self-amplifying process.
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If the gauge bosons of the thermal bath represent a dark sector, the reheating of the Standard Model is then realised through portal interactions.
The dark relic... -
Greg Jackson (SUBATECH, Nantes)8/30/24, 11:10 AM
The cosmic neutrino background, for which there is ample indirect evidence, is a remnant from when the universe was just one second old. I will discuss the rate at which neutrinos interact with a QED plasma, around MeV temperatures (just prior to their decoupling). Computing the NLO interaction rate as a function of the neutrino momentum and flavour, we recently found relative corrections on...
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Philipp Klose (Bielefeld University)8/30/24, 11:35 AM
Hot viscous plasmas unavoidably emit a stochastic gravitational wave background similar to electromagnetic black body radiation. Presenting work published in 2312.13855, we study the hidden particle contribution to the background emitted by the primordial plasma in the early universe. While this contribution can easily dominate over that from Standard Model particles, we find that both are...
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Elisa Ferreira8/30/24, 1:45 PMTalk
In this talk, I highlight the strong constraining power of small scale astrophysical observations. The small scales not only give us a window into the still not precisely measured small scale behaviour of dark matter, but it can also tell us about the particle physics properties of this component. We focus on the ultra-light dark matter models, specifically the fuzzy dark matter (FDM) model,...
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Geraldine Servant8/30/24, 2:30 PMTalk
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Anna Kormu (University of Helsinki)
Nucleation rate computations are of broad importance in particle physics and cosmology. Previously, these nucleation rates have generally been calculated perturbatively, but those calculations depend on the semiclassical picture of the bubble and its fluctuations, and different orders of perturbative calculation yield very different results. In this talk, I will give you an update on results...
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Dr Zebin Qiu (Keio University)Poster
We propose a vortex carrying baryon number in low energy dense QCD
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with finite baryon and isospin chemical potentials. The isospin chemical
potential is responsible for the charged pion condensate, among which
Abrikosov vortex could arise with quantized magnetic flux. Our discovery
is that when the winding of neutral pion is added, such a vortex carries a
baryon number conserved by the... -
Dian-Wei Wang (University of Chinese Academy of Sciences)
The bubble wall velocity in the first order phase transition plays an important role in determining both the amplitude and the pivot frequency of stochastic gravitational wave background. In the framework of the minimal left-right symmetric model, we study the wall velocity when the first order phase transition can occur. The wall velocity can be determined by matching the distribution...
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Ritesh Ghosh (Arizona State University, USA)Poster
Using the imaginary part of the self-energy function in the Landau-level representation, we derive the fermion damping rate in a hot magnetized plasma at the leading order of coupling. The results are used to investigate the longitudinal and transverse electrical conductivities. In the relativistic regime, these conductivities exhibit a scaling behavior expressed in terms of dimensionless...
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Philipp Schicho (Goethe University Frankfurt)
Scale hierarchies are required to reliably describe the thermodynamics of cosmological first-order phase transitions using perturbation theory. At finite temperature, such a hierarchy is provided naturally. One can then use this hierarchy to construct a three-dimensional effective field theory (EFT) that systematically includes thermal resummations to all orders.
Using this EFT setup, I...
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Gergely Marko (Bielefeld University)
We investigate spontaneous symmetry breaking using the constraint effective potential. The method is formulated as a path integral, where only configuration with a restricted order parameter value contribute. The construction approximates the usual effective potential, becoming exact in the infinite volume limit. In theory, this allows access to spontaneously broken phases directly for Monte...
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Zsolt Szép (HUN-REN-ELTE Theoretical Physics Research Group)Poster
In order to describe low-scale leptogenesis in the early Universe, we calculate in a beyond SM settings the measure of CP violation, which comes from the interference of a tree-level and one-loop decay amplitudes. The imaginary part of the one-loop vertex function is written using both finite temperature cutting rules of the real time formalism and analytic continuation in the imaginary time...
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Satumaaria SukuvaaraPoster
Studying the evolution of bubbles is a necessary part of learning about the progression of early universe phase transitions and resulting gravitational waves. In this work we look into the effects the background thermal fluctuations have on the field evolution during the phase transition in O(N) scalar field theory. We do a classical statistical simulation of two colliding bubbles nucleated on...
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Maciej Kierkla (University of Warsaw)
We present an analysis of the first-order supercooled phase transition associated with symmetry breaking in the early Universe in a classically scale-invariant model. We analyze the role of higher order thermal corrections for these transitions, and to what extent they can be computed using dimensionally reduced effective field theory (3D EFT). This framework requires high temperature (HT)...
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Marc Comadran (Universitat de Barcelona (UB), IEEC, ICE)
In high temperature and/or density plasmas, perturbative calculations typically assume massless plasma constituents. We consider small masses ($m \ll T$ or $m \ll \mu$) and compute mass corrections ($\sim m^2/T^2$ or $\sim m^2/\mu^2$) for the photon polarization tensor in a QED plasma at high temperature $T$ or chemical potential $\mu$.
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To this aim, we employ EFT techniques, the so called... -
Leon Sandbote
Background electric fields might exist in the early stages of heavy-ion collisions. The response of the QCD medium to such fields is described by the electric susceptibility of QCD. In the past, various definitions were given for this observable that lead to different results at nonzero temperature. With the help of an exact fermion propagator in a homogenous electric background field at...
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Jaakko Hällfors (University of Helsinki)
A first-order phase transition at the electroweak scale is a common feature of many extensions of the Standard Model. The bubble nucleation rate is one of the key parameters describing this process and its lattice computation involves determining the statistical probability of critical bubbles. With the help of multicanonical Markov chain Monte Carlo the probability distribution can be sampled...
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Christoph Konrad (Goethe-University Frankfurt am Main)Poster
For the exploration of the phase diagram of finite density QCD, effective Polyakov loop theories derived from lattice QCD provide a valuable tool in the large quark mass regime. Using mean field approximations these theories are evaluated in the high and low temperature regimes at finite baryon chemical potential. The resulting phase diagram is discussed.
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Matteo Buzzegoli (West University of Timisoara)Poster
Synchrotron radiation (SR) is emitted by charged particles moving in magnetic fields and has numerous applications in many areas of physics. Often the charged particles are also part of a larger rotating system, e.g. the quark-gluon plasma and rotating stars. I will show that SR exhibits a remarkable sensitivity to the angular velocity of rotation. Additionally, the size of rapidly rotating...
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Prof. Alessio Zaccone (University of Milan)Poster
Our understanding of ordinary liquid matter is based on the statistical physics of Brownian motion and self-diffusion, as embodied in the complementary descriptions of Einstein and Langevin. The Langevin equation as a stochastic equation of motion which comprises all physical effects of atomic motion in liquids (from conservative interactions to dissipation) is used ubiquitously to predict the...
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Stanislaw Mrowczynski (National Centre for Nuclear Research, Warsaw,)Poster
According to the Color Glass Condensate approach to relativistic heavy-ion collisions, the earliest phase of the collision is a glasma which is made of highly populated gluon fields that can be treated classically. Using a proper time expansion we study analytically various properties of the glasma. In particular, we compute the glasma energy-momentum tensor which allows us to obtain the...
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Victor E. Ambruș (West University of Timișoara)Poster
In a strong background magnetic field, the fermionic plasma exhibits dissipationless anomalous transport, manifested as non-vanishing currents aligned with the magnetic field. This talk focuses on the novel helical separation effect (HSE), related to the emergence of a helicity current, defined by means of a suitable helicity operator, which is conserved even in the presence of the background...
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Isabella Danhoni (TU Darmstadt)Poster
The next-to-leading order weak-coupling shear viscosity of QCD was computed 6 years ago.
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However, these results have never been applied at finite baryon chemical potential $\mu$, even though intermediate-energy heavy ion collisions and merging neutron stars may explore the Quark-Gluon Plasma in a regime where baryon chemical potentials are large.
Here we extend the next-to-leading order... -
Daniel Schmitt
Different thermal resummation techniques impact the gravitational wave (GW) spectra from cosmological first-order phase transitions predicted in a given particle physics model. To investigate this effect, we perform large-scale parameter scans of the electroweak phase transition (EWPT) in the dynamical real-singlet extension of the Standard Model (SM) using three different perturbative...
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Hanna Lempiäinen (University of Helsinki)
Hydrodynamic simulations of neutron star mergers require knowledge not only of the equilibrium properties of strongly interacting matter, but also of the system’s response to perturbations, encoded in various transport coefficients. Among the different transport coefficients, the bulk viscosity, which quantifies energy dissipation during a rapid compression or expansion of matter, stands out...
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120. Inhomogeneous condensation in the Gross-Neveu model in noninteger spatial dimensions 1 <= d < 3Adrian Koenigstein (Friedrich Schiller University Jena)
We investigate the (inhomogeneous) phase structure of the Gross-Neveu model in a noninteger number of spatial dimensions 1 <= d < 3 in the limit of an infinite number of fermion species at (non)zero chemical potential and nonzero temperature.
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The phase diagram of the Gross-Neveu model in 1 <= d < 3 spatial dimensions is well known under the assumption of spatially homogeneous condensation... -
DIVYARANI CHANDRABABU GEETHA (University of Stavanger, Norway)Poster
The complex dynamics of Quark - Gluon Plasma in its non-equillibrium state has been a hot topic since many years. One of the main aspects which lead to this complex behaviour is instabilities, generated due to the non-uniform distribution of color charges. Depending on different color modes, they can strongly influence the temporal evolution of the system. Inspired by this, we consider a...
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Bastian Brandt
We study meson condensation in a QCD setting with four light quark flavours using chiral perturbation theory. In particular, we group the quarks in two isospin-flavour doubletts, including the lighter and the heavier quarks, respectively, and introduce isospin-type chemical potentials for both. Depending on the values of the chemical potentials and quark masses, different types of mesons,...
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Tuomas Tenkanen (Helsinki Institute of Physics)
I present a model independent framework to study gravitational waves from cosmological first-order phase transitions. This framework is based on factorisation of phase transition dynamics at infrared, in three-dimensional effective theory, and temperature dependence encoded in dimensional reduction matching relations at ultraviolet. Within an infrared EFT, leading order behaviour of transition...
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Chiara Le Roux (Lund University)Poster
In the present work, we have addressed the puzzle related to the observation of collective flow in collisions of small systems (which indicates the presence of a medium even in such collisions) and the absence of jet quenching in such systems (which would not be expected if jets are traversing a medium). For that, we have used the JEWEL event generator with a ``brick"-like medium. This...
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Anil Kumar (Indian Institute of Technology Jodhpur)Poster
The massive stars end their lives by supernova explosions leaving central compact objects that may evolve into neutron stars. Initially, after birth, the star remains hot and gradually cools down. We explore the matter and star properties during this initial stage of the compact stars considering the possibility of the appearance of deconfined quark matter in the core of the star. At the...
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Magdalena Eriksson (University of Bern)
A framework to describe long-distance dynamics of an electroweak phase transition is offered by fluctuating hydrodynamics. In this setup the neutral Higgs component can be modelled to evolve according to a Langevin equation. In this talk we report on recent results for the thermal Higgs interaction rate close to a first order EW phase transition, which appears as a coefficient in a Langevin...
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Tulio Eduardo Restrepo Medina (Universidade Federal do Rio de Janeiro)
We compute the QCD pressure from first principles within perturbative QCD at very high magnetic fields up to next-to-leading in two different scenarios: hot quark matter and cold and dense quark matter.
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We study the converge of the perturbative series for the pressure for different choices of medium dependent running coupling.
In the case of hot quark matter, we also calculate the chiral... -
Kaapo Seppänen (University of Helsinki)Poster
Understanding the thermodynamics of cold and dense QCD matter has become a prominent research topic due to recent advances in neutron-star observations. Unfortunately, the notorious Sign Problem impedes the study of such matter using lattice QCD.
However, nonperturbative inequalities constrain the pressure of dense QCD with its phase-quenched counterpart, a Sign-Problem-free theory that is...
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Eric Oevermann (Friedrich-Schiller-University Jena, Theoretisch-Physikalisches Institut)
Two-dimensional QCD was first studied by G. 't Hooft as a model for mesons in the limit of an infinite number of colours where it admits an exact solution. We investigate the model with the FRG at finite number of colours in the vacuum and present the first stages of our study towards dynamical hadronization in this model. In particular, we derive how local four-fermion interactions emerge...
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Volodymyr Chelnokov (Goethe University Frankfurt)Poster
At nonzero isospin chemical potential, in addition to the usual hadronic and quark-gluon plasma phases, a pion condensed phase appears in the QCD phase diagram, bounded by a second-order transition line. This setup is sign-problem-free and can be studied using standard lattice Monte-Carlo methods. An overview of the phase diagram and the possible applications of finite isospin simulation...
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Gerhard Ungersbaeck (University of Stavanger)
In certain models of inflation, the postinflationary reheating of the Universe is not primarily due to perturbative decay of the inflaton field into particles, but proceeds through a tachyonic instability. In the process, long-wavelength modes of an unstable field, which is often distinct from the inflaton itself, acquire very large occupation numbers, which are subsequently redistributed into...
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Yunxin YePoster
In this work, Quark-Meson model is formulated in real-time, taking into account the dynamic properties (dissipation of $\sigma$ and $\pi$) by considering the system interacting with a heat bath. The symmetry of thermal equilibrium of the real-time action combined fermionic system is studied. Real-time functional renormalization group method is employed to study the flow of the effective...
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Masoud Shokri (Goethe University)Poster
Relativistic magnetohydrodynamics (MHD) effectively describes the mutual evolution of fluid and electromagnetic fields. Its basic equations are based on the conservation of charges, including the electric charge and energy-momentum, together with the Maxwell equations. Although the Maxwell equations, and the Maxwell energy-momentum tensor, are rigorously known, the formulation of the...
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Laurin Pannullo (University of Bielefeld)
We present continuum extrapolated results of the QCD contribution to the axion-photon coupling extracted from Lattice QCD simulations. Our simulations employ 2+1 flavors of improved staggered fermions for physical quark masses with electromagnetic background fields with nonzero $\vec{E}\cdot\vec{B}$. These electromagnetic fields induce a non-zero expectation value of the topological charge...
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Jay Bhambure (Stony Brook University)
We study an approach for simulating the stochastic relativistic advection-diffusion equation based on the Metropolis algorithm. We show that the dissipative dynamics of the boosted fluctuating fluid can be simulated by making random transfers of charges between fluid cells, interspersed with ideal hydrodynamic time steps. The random charge transfers are accepted or rejected in a Metropolis...
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Sergio Morales Tejera (West University of Timisoara)Poster
Anomaly induced transport phenomena, such as the Chiral Vortical Effect (CVE) and Chiral Vortical Separation Effect (CVSE), are expected to appear in systems with vector and axial symmetries under rotation, and their coherent interplay gives rise to the so-called Chiral Vortical Wave (CVW). In this talk, we generalise the previous studies to include an independent conserved charge for a system...
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