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Robbe Brants (Ghent University)19/08/2026, 16:00Quantum fields in and out of equilibrium and thermalisationposter
Relativistic hydrodynamics successfully provides an effective field theory description for the low energy regime of many out-of-equilibrium systems. On the other hand, we proved that any stand-alone hydrodynamic EFT is inherently acausal and therefore requires the addition of transient UV modes in order to restore causality. This is made possible by the exponential decay of dissipative...
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Nabeen Bhusal (DESY)19/08/2026, 16:00Early universe physics, inflation, electroweak phase transitions, and sources for gravitational wavesposter
Any viable inflationary model must account for reheating of the universe prior to the onset of primordial nucleosynthesis. In this work, we study the (p)reheating mechanism for an inflaton field with a quartic minimum of the T-model kind with coupling $\lambda$, prior to and post fragmentation, making a clear distinction between the two regimes. We assume that the main particle production...
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Leon Sandbote (University of Helsinki)19/08/2026, 16:00QCD in extreme conditions and dense nuclear matterposter
Completing the N$^3$LO Yang-Mills pressure, as well as understanding the microphysics of cosmological phase transitions is currently hindered by the challenging evaluation of multi-loop finite temperature sum-integrals.
Tree-Loop Duality is a framework for the numerical evaluation of multi-loop integrals. Recently, this approach was extended to finite temperature in the case of infrared...
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Aatu Rajala (University of Helsinki)19/08/2026, 16:00Quantum fields in and out of equilibrium and thermalisationposter
Entanglement is a defining property of quantum physics and provides a natural way to characterize correlations. Despite some inherent difficulties, there has been considerable advancement in lattice evaluations of entanglement measures, such as entanglement entropy (EE), in QFTs.
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In my poster, I will present our argument that, in certain attainable limits, a derivative of EE approaches the... -
Rens Roosenstein (University of Cape Town)19/08/2026, 16:00Quantum fields in and out of equilibrium and thermalisationposter
Motivated by the recent small systems collisions at the LHC, we present exact first principles results for the finite-system-size corrections to the pressure in both massless and massive non-interacting scalar field theories, highlighting the deviations from the Stefan-Boltzmann limit. The methods used to derive this result rely on a rigorous formulation of the path integral partition function...
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Florian Lindenbauer (Massachusetts Institute of Technology)19/08/2026, 16:00Quantum fields in and out of equilibrium and thermalisationposter
QCD kinetic theory is an established method for modeling the time evolution of deconfined QCD matter and is also applicable out of equilibrium. It has been used to study how an initially far-from-equilibrium QCD plasma thermalizes and hydrodynamizes. However, numerical implementations employ simplified assumptions in evaluating the high-dimensional phase-space integral, such as a simplified...
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Nicklas Ramberg (SISSA)19/08/2026, 16:20Early universe physics, inflation, electroweak phase transitions, and sources for gravitational wavesposter
We attempt to reformulate the problem of the microscopic friction force exerted on a bubble wall, focusing on strongly interacting plasmas. Across the confinement transition, the loss of a quasiparticle description renders a conventional kinetic theory approach challenging, so that assuming local thermal equilibrium (LTE) can provide an upper bound on the wall velocity by neglecting the...
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Mattis Harhoff (Universitรคt Bielefeld)19/08/2026, 16:20QCD in extreme conditions and dense nuclear matterposter
Stochastic hydrodynamics provides a dynamical framework for the evolution of fluctuations in heavy-ion collisions, but poses significant challenges in numerical simulations. We present an algorithm for the simulation of non-relativistic stochastic hydrodynamics in two spatial dimensions in a box, both in the cases of compressible and incompressible fluids. We use the robust Metropolis...
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Selina Kunkel19/08/2026, 16:20Compact starsposter
At high densities and low temperatures, hadronic matter is expected to undergo a first-order phase transition into a color-superconducting state. While such conditions occur in neutron stars, studies focusing only on cold neutron stars are not fully conclusive because they neglect the evolutionary processes that may influence the appearance of color-superconducting phases. A protoโneutron...
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Mr Olavi Kiuru (University of Helsinki)19/08/2026, 16:20Compact starsposter
In the magnetospheres of magnetars, strongly magnetized neutron stars, the magnetic field can be tens of times the critical Schwinger field $B_Q = m^2/e \approx 4.41\cdot 10^{13}$ G. In this strong field regime quantum electrodynamics (QED) becomes nonlinear, which has profound effects on the plasma dynamics of the magnetosphere. Most notably the energies of electrons and positrons become...
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Jani Dahl (University of Helsinki)19/08/2026, 16:20Early universe physics, inflation, electroweak phase transitions, and sources for gravitational wavesposter
A first-order phase transition in the early universe acts as a potential source of primordial gravitational waves (GWs). For a wide range of scenarios, the dominant GW contribution is believed to arise from sound waves, whose decay through acoustic turbulence plays a vital role in determining the intensity of the ensuing GW signal. To study this decay, we have developed a relativistic...
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Mathias Pavely Nรธdtvedt (Norwegian University of Science and Technology (NTNU))19/08/2026, 16:20Compact starsposter
Quantum chromodynamics (QCD) at finite baryon chemical potential remains hard to access by first-principles methods, making effective models an essential tool for exploring this region of the phase diagram. The quarkโmeson (QM) model provides a viable alternative to more established approaches such as the NambuโJona-Lasinio model, with the advantage that it can be matched to physical...
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Pietro Rescigno (RIKEN Center for Computational Science)19/08/2026, 16:20QCD in extreme conditions and dense nuclear matterposter
In the last years the non-perturbative predictions of QCD at temperatures up to the Electroweak scale have become accessible, thanks to a novel computational strategy that allows to define and efficiently simulate the thermal lattice theory at very high temperatures. The length scales over which the strong force is screened in the thermal medium are observables of primary interest in this...
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Guilherme Catumba (University Milano-Bicocca)19/08/2026, 16:40QCD in extreme conditions and dense nuclear matterposter
High-temperature QCD can be described, through dimensional reduction,
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by a series of 3D effective field theories. Electrostatic QCD consists
of a gauged-scalar theory, while magnetostatic QCD (MQCD) of a pure 3D
gauge theory. The use of dimensionally reduced effective theories to
predict 4D observables relies on the matching between the 3D and 4D
theories, which, at present, is only known... -
Daniel Schmitt (KIT)19/08/2026, 16:40Early universe physics, inflation, electroweak phase transitions, and sources for gravitational wavesposter
Axion-like particles (ALPs) are among the most promising dark matter candidates. Yet a large part of parameter space, in particular the regime of large decay constants where ALPs become effectively invisible, remains difficult to probe experimentally. In the supercooled audible axion mechanism, invisible ALPs can generate a sizable primordial gravitational wave (GW) background via a tachyonic...
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Eric Oevermann (Friedrich Schiller University Jena)19/08/2026, 16:40QCD in extreme conditions and dense nuclear matterposter
QCD with a real chemical potential suffers from a sign problem in numerical calculations of Euclidean space path integrals. A novel approach exploits the fact that an imaginary chemical potential avoids the sign-problem and can be interpreted as a real Lagrange multiplier enforcing a current density rather than a number density. At zero temperature, Lorentz symmetry then allows rigorous upper...
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Georg Wieland (University of Graz)19/08/2026, 16:40Early universe physics, inflation, electroweak phase transitions, and sources for gravitational wavesposter
Gauge invariance requires physical states to be composite, even in the weak sector of the SM. The Frรถhlich-Morchio-Strocchi (FMS) mechanism resolves this subtlety by predicting a one-to-one mapping between gauge and global degrees of freedom. Following the FMS framework, gauge-invariant composite operators for the Higgs, W/Z bosons, and weakly charged leptons are constructed by dressing the...
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Matisse De Lescluze (Ghent University)19/08/2026, 16:40Quantum fields in and out of equilibrium and thermalisationposter
Nonthermal fixed points are universal, attractive stages in the far-from-equilibrium dynamics of quantum many-body systems. Static Nonthermal Fixed points are well understood and have been experimentally observed in cold-atom experiments. They have been theoretically predicted in models of early-universe cosmology and ultra-relativistic heavy-ion collisions. In these set-ups, expansion plays...
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Sergio Barrera Cabodevila (Heidelberg University)19/08/2026, 16:40Heavy-ion collisions and the quark gluon plasmaposter
The Standard Model of Heavy-Ion admits a kinetic theory phase as the step before thermalization. In this context, the Effective Kinetic Theory (EKT) has been widely used to describe the formation of the Quark-Gluon Plasma in systems with enhanced symmetry, leading to phenomenologically sensible results. However, the numerical complexity of the Monte Carlo evaluations of the collision kernels...
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Selda Koivula (University of helsinki)19/08/2026, 16:40Early universe physics, inflation, electroweak phase transitions, and sources for gravitational wavesposter
In extensions of the Standard Model, symmetry breaking or confinement of new gauge groups can give rise to first order phase transitions. The phase transition creates expanding bubbles of the stable phase that grow and merge until they fill the entire universe, leaving behind pressure and velocity perturbations. This process creates gravitational waves. The Laser Interferometer Space Antenna...
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Martina Cataldi (University of Hamburg)19/08/2026, 17:00Baryogenesis and leptogenesisposter
Baryon number can be efficiently violated at low temperatures, from Higgs bubble collisions in a strongly first-order electroweak phase transition, based on the dynamics of electroweak textures [2508.21825]. This may open up new possibilities of realizing electroweak baryogenesis in models with a low reheat temperature and large bubble wall velocity.
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In this talk, I will propose a novel... -
Rachel Steinhorst (Massachusetts Institute of Technology)19/08/2026, 17:00Compact starsposter
Hydrodynamic simulations of neutron star mergers rely on the clear separation between the strong-interaction, weak-interaction, and hydrodynamic timescales. In this effective framework, weak Urca interactions are typically the slowest microscopic processes, and therefore the Urca rate determines the bulk-viscous dissipation. This assumed hierarchy of dissipative mechanisms can be decisively...
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Mr Sudeep Saha19/08/2026, 17:00Heavy-ion collisions and the quark gluon plasmaposter
We calculate the cross section for the heavy quark $(Q)$ production through gluon $(g)$ fusion process $g+g\to Q+\bar{Q}$ in the presence of a weak external magnetic field $(B)$. Several studies have estimated the $B$ field strength in non-central heavy-ion collisions to be $eB\sim m_\pi^2\sim 10^{18},\text{G}$. Thus, for heavy flavour mass $m_Q$, the inequality $m_Q^2 \gg eB$ is largely...
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Zhong-Hua Zhang (Fudan University)19/08/2026, 17:00Heavy-ion collisions and the quark gluon plasmaposter
Relativistic hydrodynamics is the universal long-wavelength framework for many-body systems near local equilibrium. Motivated by spin hydrodynamics and by the approximate scale symmetry of high-temperature QCD matter, I will discuss a relativistic hydrodynamic theory in which spin and intrinsic dilation are treated as quasi-hydrodynamic degrees of freedom. This talk will be based on our recent...
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Leon Sieke (Justus-Liebig-Universitรคt Giessen)19/08/2026, 17:00Heavy-ion collisions and the quark gluon plasmaposter
We investigate the out-of-equilibrium dynamics of a $Z_2$-symmetric scalar field theory with Langevin dynamics under linear driving protocols across magnetic first-order phase transitions, close to and far below the critical temperature $T_c$.
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Using classical-statistical lattice simulations, we find that if the driving timescale is sufficiently fast, the system exhibits finite-time scaling... -
RAVI SHANKER (The Institute of Mathematical Sciences)19/08/2026, 17:00Heavy-ion collisions and the quark gluon plasmaposter
In this work, we calculate the eigenvalues of the probe (overlap) Dirac operator on thermal gauge ensembles of $2+1$ flavor QCD generated using domain wall fermions as well as pure $SU(3)$ gauge theory on the lattice. Focusing on the infrared part of the eigenspectrum that lies within the non-perturbative magnetic scale, we propose suitable observables that allow us to categorize different...
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LUCA PASSARELLA (Politecnico di Torino and INFN)19/08/2026, 17:20Compact starsposter
Hadronic stars and strange quark stars could coexist within the two-families scenario, where hadronic and strange quark matter correspond to two distinct equilibrium phases described by separate equations of state (EOS). This work explores the EOS of dense matter through both statistical inference and microscopic modeling. First, we perform a detailed Bayesian analysis utilizing astrophysical...
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Satumaaria Sukuvaara19/08/2026, 17:20Early universe physics, inflation, electroweak phase transitions, and sources for gravitational wavesposter
While cooling down, the early universe is believed to have undergone symmetry breaking phase transitions. One attractive possibility for extending the Standard Model is that these phase transitions are of the first order, as they might be able to produce observable gravitational waves. We consider a dark matter freeze-out mechanism, filtering, where dark matter particles become massive in a...
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Thomas Martin (University of Nottingham)19/08/2026, 17:20Early universe physics, inflation, electroweak phase transitions, and sources for gravitational wavesposter
Cosmological phase transitions remain an enticing prospect for future gravitational wave observations but second order phase transitions have been relatively untouched in the literature. To remedy this, we study the gravitational waves produced from a potential second order cosmological phase transition. We compute the anisotropic stress correlation function within multiple models of critical...
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Jaakko Hรคllfors19/08/2026, 17:20Early universe physics, inflation, electroweak phase transitions, and sources for gravitational wavesposter
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Salma Kรคmpf (University of Geneva)19/08/2026, 17:20Early universe physics, inflation, electroweak phase transitions, and sources for gravitational wavesposter
We investigate the dynamics of first-order phase transitions by studying the impact of both soft fluctuations and higher-dimensional operators on bubble wall velocities. Focusing on Higgsโgauge theories, we compute the bubble wall velocity using a finite-temperature effective theory with a cubic scalar potential supplemented by a dimension-six operator. We further incorporate...
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Johannes Roth (Uni Bielefeld)19/08/2026, 17:20Heavy-ion collisions and the quark gluon plasmaposter
In the two-flavor chiral limit, the chiral phase transition of QCD is expected to be continuous and in the $O(4)$ universality class. Its real-time dynamics is expected to fall into the dynamic universality class of Model G, i.e., the one of a Heisenberg antiferromagnet. At larger baryon chemical potential, the $O(4)$ line is expected to end in a tricritical point, beyond which the transition...
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Hosein Gholami19/08/2026, 17:40QCD in extreme conditions and dense nuclear matterposter
Recent observations of neutron stars provide insights into the equation of state of matter at high densities, where exotic phases may emerge. One candidate is color superconductivity, in which quarks form diquark pairs that condense. A first-principles understanding of diquark dynamics is therefore essential for interpreting astrophysical data. In this work, we present a self-consistent,...
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Mr Jonas Winter (Darmstadt)19/08/2026, 17:40Heavy-ion collisions and the quark gluon plasmaposter
Transport coefficients play an important role for hydrodynamical simulations of the Quark-Gluon Plasma which is used for e.g. Heavy-Ion Collisions. Especially the Vorticity is a second-order transport coefficient of interest, as it can be calculated directly for Lattice QCD via time-averaged correlation functions of the energy-momentum tensor. In this poster, we present an advanced approach in...
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Shu Lin19/08/2026, 17:40Heavy-ion collisions and the quark gluon plasmaposter
We develop a quantum kinetic theory for QCD, which incorporates all leading order collision terms. The diagonal components of the Wigner functions for quarks and gluons satisfy a spin-averaged Boltzmann equation. The non-diagonal components of the Wigner functions give spin polarization of on-shell quarks and gluons in quark-gluon plasma induced by hydrodynamic gradients. A power counting in...
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Jannis Gebhard (Heidelberg University)19/08/2026, 17:40Heavy-ion collisions and the quark gluon plasmaposter
High-energy heavy-ion collisions create a quarkโgluon plasma (QGP) with approximately restored chiral symmetry. Lattice QCD determines the chiral crossover temperature to be $T_c \simeq 156 \pm 1.5 \, \mathrm{MeV}$, below which chiral symmetry is spontaneously broken and pions emerge as pseudoโGoldstone bosons. Yet, this chiral transitionโsecond order in the chiral limitโis absent from current...
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Mr Pablo Navarrete (University of Helsinki)19/08/2026, 17:40QCD in extreme conditions and dense nuclear matterposter
A longstanding obstacle to mapping the phase diagram of quantum chromodynamics (QCD) in the temperatureโbaryon density plane is the Sign Problem of lattice Monte Carloโthe only reliable nonperturbative, first-principles approach to QCD. However, it is known that nonperturbative inequalities bound the thermodynamic pressure of QCD matter by that of its phase-quenched (PQ) versionโa...
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