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Risto Paatelainen (University of Turku)17/08/2026, 08:45
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Dana Avramescu (University of Jyväskylä)17/08/2026, 09:00
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Hannah Bossi (Massachusetts Inst. of Technology (US))17/08/2026, 09:45
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Adam Takacs (Heidelberg University)17/08/2026, 11:00
Jet quenching - the modification of high-energy jets in the quark-gluon plasma - has been extensively studied through weakly coupled scattering amplitudes embedded in parton-shower frameworks. These models, often combined with bulk hydrodynamic evolution, successfully describe a wide range of observables, though they typically rely on assumptions of rapid thermalization and simplified...
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69. Jets and medium-induced radiation during the early nonequilibrium stages in heavy-ion collisionsFlorian Lindenbauer (Massachusetts Institute of Technology)17/08/2026, 11:30
One of the central open questions in heavy-ion collisions is how the initially far-from-equilibrium plasma of deconfined quarks and gluons evolves toward local thermal equilibrium, a process known as hydrodynamization. Despite its importance, direct experimental signatures of this early pre-equilibrium stage remain elusive. Hard probes, such as jets, produced at very early times, offer a...
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Min An (Central China Normal University and Bielefeld University)17/08/2026, 12:00
High-energy partons traversing the quark-gluon plasma (QGP) lose energy primarily through splittings induced by interactions with the medium. These processes have been studied extensively in different approximations, often assuming a near-equilibrium medium background. However, in realistic heavy-ion collisions, the QGP starts far from equilibrium and undergoes an expansion and thermalization...
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Jean Du Plessis (Massachusetts Institute of Technology)17/08/2026, 12:15
Heavy quarks are usually modeled as Brownian probes of the quark-gluon plasma, with momentum exchange encoded by drag and Gaussian diffusion. Recent weak- and strong-coupling results show that this diffusion truncation misses a robust feature of real-time heavy-quark dynamics: the longitudinal momentum-transfer distribution has a Gaussian core but asymmetric exponential tails. These tails are...
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Thomas Schaefer (North Carolina State University)17/08/2026, 14:00
We describe recent results obtained from numerical simulations
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of stochastic fluid dynamics near a QCD critical point. We
discuss results for the dynamic critical exponent, the
critical behavior of transport coefficients, and the relaxation
rate of equal-time correlation functions. We also discuss
some exploratory studies of stochastic relativistic fluid
dynamics. -
Prof. Lorenz von Smekal (JLU Giessen)17/08/2026, 14:30
We study universal aspects of critical dynamics in QCD matter within our real-time formulation of the functional renormalization group (FRG) for dynamical systems with reversible mode couplings. The two most relevant ones for QCD describe the dynamics across the chiral transition and that near the QCD critical point, in the dynamical universality classes of Models G and H, respectively. We use...
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Sergio Barrera Cabodevila (Heidelberg University)17/08/2026, 14:45
In this talk, we use the Boltzmann Equation in the Diffusion
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Approximation (BEDA) as a tool to understand how the initial state
azimuthal anisotropies are washed out because of the final state
interactions. The interplay of $1\leftrightarrow 2$ and
$2\leftrightarrow 2$ interactions relax the initial anisotropies in a
characteristic manner. We observe how, for an initial anisotropy... -
Jie Zhu17/08/2026, 15:00
So far a major source of uncertainty in the study of heavy-ion collisions arises from the early time dynamics which includes initial state and pre-equilibrium dynamics. The state-of-the-art framework, \kompost~\cite{Kurkela:2018vqr,Kurkela:2018wud}, employs non-equilibrium Green's functions to propagate the initial energy-momentum tensor to the hydrodynamic phase, yet currently only treats...
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Dr Pooja - (University of Jyväskylä)17/08/2026, 15:15
We study the classical chaoticity of the glasma, the far-from-equilibrium gluonic state formed in the early stages of heavy-ion collisions, using 2+1D real-time lattice simulations within the McLerran-Venugopalan model. By monitoring the evolution of small perturbations in boost-invariant color fields, we demonstrate that fluctuations grow exponentially as $\sim \exp(\lambda...
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Clemens Werthmann (Ghent University)17/08/2026, 15:30
Many model descriptions of the evolution of a heavy ion collision in Bjorken flow feature hydrodynamic attractor behaviour, referring to a quick memory loss mechanism and decay towards a universal time evolution curve that will itself converge to hydrodynamic behaviour. This has so far been observed in kinetic theory and in transient hydrodynamics. In both cases, at very early times, it is not...
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Harri Niemi (University of Jyväskylä), Henry Hirvonen (Vanderbilt University), Dr Jussi Auvinen (University of Wroclaw), Prof. Kari J. Eskola (University of Jyväskylä (FI))17/08/2026, 15:45
Bayesian global analysis of measured observables is nowadays a standard method for determining the properties and initial conditions of the hot QCD-matter produced in ultrarelativistic heavy-ion collisions. However, even with surrogate models like Gaussian process emulators (GPEs) reducing the amount of simulations, it can be computationally prohibitively expensive to produce sufficient...
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Krishna Rajagopal (Massachusetts Inst. of Technology (US))17/08/2026, 16:30
Quarks and gluons within a proton are confined within a volume in which the energy density and pressure are comparable to those of quark-gluon plasma (QGP) at or just above the QCD transition temperature. With this as motivation, I will investigate the interplay between the thermodynamic (Gibbs) entropy of QGP and the entanglement entropy of confined hadronic states across the quark-hadron...
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Panayiotis Panayiotou (Technical University of Munich)17/08/2026, 17:00
I will outline a systematic description of medium induced modifications to quarkonium in a quark gluon plasma by making use of the Open Quantum Systems framework and effective field theories such as pNRQCD. These medium effects are encoded in a finite set of transport coefficients defined through real-time thermal chromoelectric correlators, which can be associated with analytically continued...
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Miguel Angel Escobedo Espinosa (Universitat de Barcelona)17/08/2026, 17:15
The open quantum system framework allows one to compute quarkonium's evolution in a medium, keeping track of the needed quantum features. However, computing this evolution is a computationally demanding task. QTRAJ is an efficient code that allows one to simulate the behavior of quarkonium in a medium in the case in which the medium sees quarkonium as a small color dipole $rT\ll 1$. While this...
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Pietro Benzoni (Subatech)17/08/2026, 17:30
Colour decoherence in jet quenching has been the subject of intense theoretical activity and is actively searched for at RHIC and the LHC. However, it has so far lacked a systematic foundation from the perspective of open quantum systems, where the notion of decoherence is naturally formulated. In this talk (based on [1]), the open quantum systems framework is used to investigate the real-time...
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Zhong-Hua Zhang (Fudan University)17/08/2026, 17:45
Spin polarization has become a sensitive probe of vorticity and shear structures in the quark-gluon plasma. While global hyperon polarization can be largely understood from spin-vorticity coupling, the tensor polarization, or spin alignment, of vector mesons remains a challenging observable whose magnitude and sign depend strongly on collision energy, momentum, and meson species.
In this...
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Guy D. Moore17/08/2026, 18:00QCD in extreme conditions and dense nuclear mattertalk (30min)
If axions exist, thermal axions are in equilibrium at high temperatures and freeze out at a temperature which depends on their coupling.
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If the freezeout temperature is at or below the QCD crossover temperature range, thermal axions may be detectable in the cosmic radiation budget.
But evaluating the thermal axion-QGP coupling requires nonperturbative tools.
We show how to use lattice... -
Matteo Bresciani (Trinity College Dublin)18/08/2026, 09:00QCD in extreme conditions and dense nuclear mattertalk (plenary, 45min)
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Kaapo Seppänen18/08/2026, 09:45QCD in extreme conditions and dense nuclear mattertalk (plenary, 45min)
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Lorenzo Gavassino18/08/2026, 11:00Quantum fields in and out of equilibrium and thermalisationtalk (plenary, 45min)
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Simon Stendebach (TU Darmstadt)18/08/2026, 11:45QCD in extreme conditions and dense nuclear mattertalk (15min)
The QCD topological susceptibility $ \chi $ gives the mass of the hypothetical QCD axion. Understanding its behavior at high temperatures $ T $ is important for the axion’s cosmological history and possible role as the dark matter. In this work, we measure $ \chi $ directly from unquenched 2+1+1 flavor Lattice QCD in a temperature range of 435 MeV to 1020 MeV. To resolve the problem of...
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Michael Mandl (University of Graz)18/08/2026, 12:00QCD in extreme conditions and dense nuclear mattertalk (15min)
A proper understanding of QCD under extreme conditions such as high temperature and densities is of fundamental importance for the theoretical description of, e.g., heavy-ion collisions, neutron stars, and the early universe. However, the non-perturbative study of QCD at non-zero baryon density from the point of view of lattice field theory is hampered by the infamous sign problem, preventing...
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Prof. Angel Gomez Nicola (Universidad Complutense Madrid)18/08/2026, 12:15QCD in extreme conditions and dense nuclear mattertalk (15min)
We will review recent progress towards the understanding of chiral and $U(1)_A$ symmetry restoration within the QCD phase diagram, arising from our results on effective theories, Ward Identities (WI) and resonances at finite temperature and chemical potentials. Our approach allows to control in a systematic and consistent way the dependence on relevant variables such as quark masses,...
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York Schröder .18/08/2026, 14:00QCD in extreme conditions and dense nuclear mattertalk (30min)
There has been quite some activity in finding methods to evaluate cold+dense vacuum integrals that emerge in perturbative treatments of dense (but deconfined) quark matter, conjectured to play a role in neutron star cores and hence potentially relevant to the gravitational-wave physics of colliding compact stars.
The purpose of this rather technical talk is to report on progress about...
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Tyler Gorda (The Ohio State University)18/08/2026, 14:30QCD in extreme conditions and dense nuclear mattertalk (30min)
The equation of state of deconfined strongly interacting matter at high densities remains an open question, with effects from quark pairing in the preferred color-flavor-locked (CFL) ground state possibly playing an important role. Recent studies suggest that at least large pairing gaps in the CFL phase are incompatible with current astrophysical observations of neutron stars. At the same...
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Orestis Papadopoulos (University of Southampton)18/08/2026, 15:00QCD in extreme conditions and dense nuclear mattertalk (15min)
Anisotropic phases are hypothesised to play a role in the small temperature and large chemical potential regime of the QCD phase diagram, making their existence in the core of neutron stars a concrete possibility. I will present the study of such a phase, the chiral density wave (CDW), defined as an anistropic chiral condensate. The nuclear CDW is firstly studied within a nucleon-meson model,...
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Theo Motta (Justus Leibig University Gießen)18/08/2026, 15:15QCD in extreme conditions and dense nuclear mattertalk (15min)
We investigate the possibility of a crystalline phase of dense nuclear matter as a constituent of neutron star cores. Performing a stability analysis of the most stable homogeneous ground state, we first show that symmetric nuclear matter is unlikely to manifest instabilities, however, its phase diagram is extremely likely to be almost completely embedded in a moat-regime, where the...
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Dr Zebin Qiu (Keio University)18/08/2026, 15:30QCD in extreme conditions and dense nuclear mattertalk (15min)
We study the low-energy QCD phase diagram under a magnetic field and at finite density. Both baryon chemical potential and isospin chemical potential are taken into account. The former is responsible for a domain wall configuration of the neutral pion, dubbed the chiral soliton lattice (CSL), originating from the chiral anomaly. The latter induces the charged pion condensate that can...
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Peter Lowdon18/08/2026, 15:45Quantum fields in and out of equilibrium and thermalisationtalk (15min)
The Gell-Mann-Low relation forms the foundation of all perturbative approaches to QFT. In order to establish how perturbation theory can be consistently generalised to finite-temperature systems it is therefore necessary to understand how this relation is modified by thermal effects. In this talk I will introduce a new proposal for how this relation should be generalised, based on the...
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Michal Heller18/08/2026, 16:30Quantum fields in and out of equilibrium and thermalisationtalk (30min)
Over the past decade, relativistic hydrodynamics has been pushed into increasingly extreme regimes—from hydrodynamic attractors in theory to small-system dynamics at Relativistic Heavy Ion Collider and Large Hadron Collider. Yet these approaches ultimately remain anchored to local thermal equilibrium. In this talk, based on 2504.18754 with Berges, Denicol, and Preis, I present a fundamentally...
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Rachel Steinhorst (Massachusetts Institute of Technology)18/08/2026, 17:00Quantum fields in and out of equilibrium and thermalisationtalk (15min)
Attractors are a generic feature of far-from-equilibrium systems in which much of the memory of a system’s initial condition is lost long before local thermal equilibration. There has been recent interest in leveraging the existence of attractors to extend hydrodynamic descriptions to earlier times in the formation of QGP, largely focused on isotropic attractors. However, highly anisotropic...
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Xin An (Ghent University)18/08/2026, 17:15Quantum fields in and out of equilibrium and thermalisationtalk (15min)
Contemporary understanding of thermalization in quantum field theory (QFT) stems largely from understanding properties of transient excitations of equilibria. These nonhydrodynamic excitations are known to structurally differ between weakly- and strongly-coupled QFTs with no known results at intermediate values of the interaction strength. We demonstrate that all the known behaviors of...
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Peter Arnold (University of Virginia)18/08/2026, 17:30Quantum fields in and out of equilibrium and thermalisationtalk (30min)
Ultra-relativistic electrons passing through ordinary matter initiate electromagnetic showers that evolve through bremsstrahlung and pair production. At very high energy, the quantum mechanical duration of bremsstrahlung becomes longer than the mean free time to elastically scatter from the medium, leading to a significant suppression known as the Landau-Pomeranchuk-Migdal (LPM) effect. The...
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Matthias Carosi18/08/2026, 18:00Quantum fields in and out of equilibrium and thermalisationtalk (15min)
The out-of-equilibrium evolution of the early universe plays a central role in addressing some of the most pressing outstanding puzzles of particle physics, such as the matter-antimatter asymmetry and the production of dark matter. A consistent description of the non-equilibrium dynamics of the system requires systematically incorporating quantum and thermal effects, which can be achieved via...
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Andrey Shkerin18/08/2026, 18:15Quantum fields in and out of equilibrium and thermalisationtalk (15min)
I will discuss dynamical effects during critical bubble nucleation in thermal first-order phase transitions. These effects arise due to lack of local thermal equilibrium and affect the parameters of the transition including the nucleation rate. I will present a general method of calculating the thermal nucleation rate that accounts both for statistical and dynamical effects. I will also...
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Greg Jackson (SUBATECH (CNRS/IN2P3))19/08/2026, 09:00Early universe physics, inflation, electroweak phase transitions, and sources for gravitational wavestalk (plenary, 45min)
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Alberto Roper Pol (Universite de Geneve (CH))19/08/2026, 09:45Early universe physics, inflation, electroweak phase transitions, and sources for gravitational wavestalk (plenary, 45min)
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Bowen Fu (Northeastern University, China)19/08/2026, 11:00Early universe physics, inflation, electroweak phase transitions, and sources for gravitational wavestalk (30min)
Domain walls are two-dimensional topological defects generated when a discrete symmetry is broken during phase transitions in the early universe. The collapse of domain walls can emit gravitational waves that can be observed by interferometers. The simplest and most well-studied domain walls are from $Z_2$ symmetry breaking. However, the breaking of larger non-Abelian discrete symmetries can...
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LUIS GIL (Universidad de Granada)19/08/2026, 11:30Early universe physics, inflation, electroweak phase transitions, and sources for gravitational wavestalk (15min)
Skyrmions were originally proposed in QCD as topological solitons of the pion field, providing an emergent description of baryons without introducing additional degrees of freedom. Their topological nature and possible role as dark matter candidates have since motivated the search for analogous configurations in other theories. A common expectation, however, is that stabilizing skyrmions...
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Filippo Cutrona (Tor Vergata, INFN)19/08/2026, 11:45Early universe physics, inflation, electroweak phase transitions, and sources for gravitational wavestalk (15min)
Classically scale-invariant (and perturbative) theories provide a way to understand large hierarchies, as scales are generated through dimensional transmutation. They always lead to first-order phase transitions, since symmetries are radiatively broken, and they generically feature quasi-flat potentials, which are suitable for inflation. I will discuss a simple but fully realistic model of...
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Nabeen Bhusal (DESY)19/08/2026, 12:00Early universe physics, inflation, electroweak phase transitions, and sources for gravitational wavestalk (15min)
Baryon number violation at the electroweak (EW) phase transition has typically been associated with thermal sphalerons in the Standard Model (SM). We showed in [2508.21825, to appear in PRL] that B-violation can also occur at zero temperature from a supercooled first-order electroweak phase transition.
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In this talk, I will review the work done on B-violation from the production of EW textures... -
Mateusz Kulejewski (University of Warsaw)19/08/2026, 12:15Early universe physics, inflation, electroweak phase transitions, and sources for gravitational wavestalk (15min)
Preheating refers to a well-known set of phenomena, such as tachyonic instability and parametric resonance, associated with the dynamics of a scalar field, typically in the context of post-inflationary reheating. In this talk, I will explore the possibility of preheating-like amplification of fluctuations of a scalar field following a strongly supercooled electroweak first-order phase...
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Flynn Linton (Monash University)19/08/2026, 14:00Early universe physics, inflation, electroweak phase transitions, and sources for gravitational wavestalk (15min)
Gravitational waves from an electroweak phase transition, expected to be visible to the next generation of detectors, offer a novel probe of particle physics by encoding information about the fields that drove the transition. Calculations of the gravitational wave power spectrum often adopt simplified equations of state to describe the relativistic hydrodynamics of the phase transition. These...
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Tamara Caldas (Goethe University Frankfurt)19/08/2026, 14:15Early universe physics, inflation, electroweak phase transitions, and sources for gravitational wavestalk (15min)
We investigate the gravitational wave signatures of a supercooled cosmic phase transition within a classically conformal Standard Model extension, where quark condensation can trigger symmetry breaking via spinodal decomposition instead of conventional bubble nucleation. By studying the amplification of scalar fluctuations in the linear regime, we estimate the associated scalar-induced...
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Daniil Krichevskiy (University of Stavanger)19/08/2026, 14:30Early universe physics, inflation, electroweak phase transitions, and sources for gravitational wavestalk (15min)
First-order phase transitions in a dark sector can produce an observable stochastic gravitational-wave background, and many models predicting such signals have been studied in the context of current and future gravitational-wave experiments. For moderately strong transitions, hydrodynamical simulations suggest that sound waves generated by the expansion and collisions of true-vacuum bubbles...
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Mika Mäki (University of Helsinki)19/08/2026, 14:45Early universe physics, inflation, electroweak phase transitions, and sources for gravitational wavestalk (15min)
Gravitational waves from cosmological first-order phase transitions provide a probe of physics beyond the Standard Model that complements laboratory experiments. The gravitational wave spectrum can be computed in an effective theory of a relativistic fluid coupled to a scalar field, the order parameter of the phase transition. The coupling is effected through the effective potential and the...
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Andrii Dashko (University of Granada)19/08/2026, 15:00Early universe physics, inflation, electroweak phase transitions, and sources for gravitational wavestalk (15min)
We present a study of dimensional reduction as a tool for a precise and systematic description of thermally driven electroweak phase transitions (EWPT) in the early universe. Focusing on strong first-order transitions, which are relevant for gravitational wave cosmology, we examine higher-order dimensional reduction, the running of effective parameters within the effective field theory (EFT),...
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Killian Bouzoud (SUBATECH)19/08/2026, 15:15Early universe physics, inflation, electroweak phase transitions, and sources for gravitational wavestalk (15min)
Our current understanding of the Universe's history, based on the standard models of particle physics and cosmology, can successfully reproduce a wide variety of experimental results. Key issues like the nature of dark matter (DM) or the baryon asymmetry of the Universe (BAU) need new physics beyond the Standard Model (BSM), with most solutions invoking the existence of new particle degrees of...
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Eamonn Weitz (Universität Bielefeld)19/08/2026, 15:30Early universe physics, inflation, electroweak phase transitions, and sources for gravitational wavestalk (15min)
Thermal production of hot axions in the early universe has attracted much attention recently, owing to the fact that
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it will be sensitive to upcoming precision constraints on $N_{\mathrm{eff}}$. The theoretical uncertainty associated with
such calculations is known to come primarily from the axion production rate, which has been
studied across a broad range temperatures and axion momenta... -
Pedro Bittar (Perimeter Insitute)19/08/2026, 15:45Early universe physics, inflation, electroweak phase transitions, and sources for gravitational wavestalk (15min)
Dynamical dark energy offers an alternative to a cosmological constant with distinct observational signatures. However, the small energy density scale, Hubble-sized mass, and Planckian excursions make simple models fine-tuned and unnatural. In this talk, we discuss a weak version of the axion that can naturally reproduce the scale hierarchies expected for dark energy. After identifying the...
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Robbe Brants (Ghent University)19/08/2026, 16:00
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, 16:00
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, 16:00
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, 16:00
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, 16:00
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 (Universität Bielefeld)19/08/2026, 16:20
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, 16:20
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 proto–neutron...
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Mr Olavi Kiuru (University of Helsinki)19/08/2026, 16:20
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 Nødtvedt (Norwegian University of Science and Technology (NTNU))19/08/2026, 16:20
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 quark–meson (QM) model provides a viable alternative to more established approaches such as the Nambu–Jona-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, 16:20
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, 16:40
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, 16:40
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 Fröhlich-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, 16:40
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, 16:40
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, 17:00
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, 17:00
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, 17:00
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, 17:00
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-Universität Giessen)19/08/2026, 17:00
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, 17:00
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, 17:20
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 Hällfors19/08/2026, 17:20Early universe physics, inflation, electroweak phase transitions, and sources for gravitational wavesposter
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Salma Kämpf (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 Higgs–gauge 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, 17:20
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, 17:40
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, 17:40
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, 17:40
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, 17:40
High-energy heavy-ion collisions create a quark–gluon 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 pseudo–Goldstone bosons. Yet, this chiral transition—second order in the chiral limit—is absent from current...
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Mr Pablo Navarrete (University of Helsinki)19/08/2026, 17:40
A longstanding obstacle to mapping the phase diagram of quantum chromodynamics (QCD) in the temperature–baryon density plane is the Sign Problem of lattice Monte Carlo—the 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) version—a...
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Bogumila Swiezewska20/08/2026, 09:00Early universe physics, inflation, electroweak phase transitions, and sources for gravitational wavestalk (plenary, 45min)
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Dr Simone Blasi (DESY)20/08/2026, 09:45Early universe physics, inflation, electroweak phase transitions, and sources for gravitational wavestalk (plenary, 45min)
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Joonas Hirvonen (University of Nottingham)20/08/2026, 11:00Early universe physics, inflation, electroweak phase transitions, and sources for gravitational wavestalk (30min)
Cosmological first-order phase transitions may have generated a gravitational wave background detectable by LISA, offering a unique window into physics beyond the Standard Model. A crucial step in predicting this background is the reliable computation of bubble nucleation rates. This talk begins with an overview of the current state of perturbative calculations based on effective field...
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Dr Benoit Laurent (Perimeter Institute)20/08/2026, 11:30Early universe physics, inflation, electroweak phase transitions, and sources for gravitational wavestalk (30min)
Cosmological first-order phase transitions are of great phenomenological interest: they can generate a detectable stochastic gravitational wave background, source the baryon asymmetry of the Universe, and seed primordial magnetic fields. A key parameter governing all of these phenomena is the bubble wall velocity $v_w$, which controls the efficiency of each process.
Computing $v_w$ from...
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Maciej Kierkla (Uppsala University)20/08/2026, 12:00Early universe physics, inflation, electroweak phase transitions, and sources for gravitational wavestalk (15min)
I will present an overview of the calculation of the thermal bubble nucleation rate in the context of cosmological phase transitions. Focusing on the case of “SU(2)+Higgs” like theories, I will illustrate the calculation of nucleation rate in the framework of “high-temperature dimensional reduction”. This perturbative approach can be understood as an effective field theory (EFT) at finite...
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Juan Garnica-Aguirre (University of Warsaw)20/08/2026, 12:15Early universe physics, inflation, electroweak phase transitions, and sources for gravitational wavestalk (15min)
In this talk, I will discuss how the Schwinger–Keldysh formalism can be used to describe out-of-equilibrium effects in false vacuum decay during cosmological phase transitions. By integrating out a thermal UV sector in a scalar $\lambda \phi^4$ toy model, we derive a coarse-grained effective action for the IR modes, whose dynamics is both dissipative and stochastic. Formulating the evolution...
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Philipp Schicho (University of Geneva)20/08/2026, 12:30
The observed baryon asymmetry of the Universe provides a fundamental probe of high-scale physics and the thermal history of the electroweak plasma. Within the Standard Model, sphaleron processes partially convert a primordial $B-L$ asymmetry into baryon number, and the corresponding sphaleron conversion factor is a key ingredient in quantitative predictions of baryogenesis scenarios.
In...
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Marcela Carena21/08/2026, 09:00
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Anna Watts21/08/2026, 09:45
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Philipp Klose (Nikhef)21/08/2026, 11:00
The weak-isospin conductivity determines the rate of baryon number violating sphaleron processes in the high temperature phase of the Standard Model and is thus an important input for predictions of the primordial Baryon asymmetry. So far, only electroweak interactions were included in the computation of the conductivity. Presenting work published in 2510.20594, we for the first time also...
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Jaakko Annala21/08/2026, 11:15
The origin of the observed baryon asymmetry of our universe remains a mystery. Electroweak baryogenesis (EWBG) scenarios remain viable candidates which can be constrained by ongoing particle physics and upcoming gravitational wave experiments. The Standard Model has baryon number violating processes, the sphalerons. However, EWBG models have to introduce beyond the Standard Model physics at...
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Miguel Etienne A Vanvlasselaer (ICCUB)21/08/2026, 11:30
Sphalerons are processes which are able to violate individually the conservation of the $B+L$ number. Consequently, in the presence of a source, like a chemical potential, the sphalerons can produce a baryon number. This is the case of the traditional electroweak baryogenesis scenario where a chiral asymmetry produced by the bubble wall biases the sphalerons in the symmetric phase. If the...
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Prof. Arttu Rajantie (Imperial College (GB))21/08/2026, 11:45
The Standard Model predicts baryon number violation through the anomalous U(1) B+L symmetry, but in vacuum this process is exponentially suppressed by the sphaleron energy barrier and therefore it has never been observed. The suppression disappears in the high temperatures of the early Universe, making this an important ingredient for explaining the observed matter-antimatter asymmetry in the...
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Dr Oleg Komoltsev (Goethe-Universität Frankfurt am Main)21/08/2026, 12:00
As our understanding of cold, extremely dense matter grows, a multidisciplinary approach that combines recent progress in multimessenger neutron-star observations with theoretical knowledge of the equation of state (EoS) becomes increasingly essential. In this talk, I present a new physically motivated framework for encoding prior knowledge about dense matter arising from chiral effective...
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Bao-Jun Cai (Fudan University)21/08/2026, 14:00
Understanding the equation of state (EOS) of dense matter inside neutron stars remains an important topic in modern nuclear physics and astrophysics. Recent multimessenger observations, especially gravitational-wave measurements from binary neutron-star mergers, together with X-ray timing and radio pulsar observations, have opened new opportunities for probing matter at supranuclear densities....
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Jorinde van de Vis (CERN)21/08/2026, 14:15
Tentative evidence suggests that the cores of massive neutron stars consist of deconfined quark matter. In this talk, I argue that the formation of such a quark matter core during a galactic supernova could be accompanied by the emission of gravitational waves in the MHz band, and I discuss the computation of the signal. Gravitational wave signals from phase transitions in supernovae...
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Steven Harris (Iowa State University)21/08/2026, 14:45
As the weak interaction involves only left-handed electrons, beta-equilibration in neutron stars can generate an imbalance between left- and right-handed electrons. This imbalance is counteracted by chirality-flipping Coulomb scattering of the electrons, which occurs in proportion to the mass of the electron. When two neutron stars collide, matter is pushed far out of beta equilibrium and...
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Lorenzo Bartolini (TU Wien)21/08/2026, 15:00
The equation of state of dense nuclear matter remains one of the main uncertainties in modelling neutron star interiors. Holographic QCD provides a useful strongly coupled framework for this problem, but descriptions based on homogeneous baryonic matter generally lead to equations of state that are too stiff and struggle to reproduce realistic nuclear matter properties around saturation. In...
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Saga Säppi (ICE-CSIC & IEEC)21/08/2026, 15:15
Observations of neutron star collisions have brought about a plethora of ways to access novel properties of compact stars. Amongst them are transport phenomena: The dynamic nature of a neutron star collision probes the transport properties of extremely dense matter. Bulk viscosity is of particular importance, and is thought to leave an imprint on the gravitational wave signal emanating from...
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Ishfaq Ahmad Rather (ITP, Goethe University)21/08/2026, 15:30
We investigate the impact of a stiff dark matter equation of state (EoS) on the structure and stability of neutron stars. For dark matter, we use bosonic, self-interacting scalar fields that generate ultra-compact boson stars with compactness exceeding 1/3. Varying the dark matter particle mass and stiffness shifts stellar configurations across distinct regions of the mass–radius diagram,...
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Sarah Louisa Pitz (Goethe University Frankfurt am Main)21/08/2026, 15:45
As the number of unexplained mass–radius measurements of compact objects in the neutron star regime grows, systematically comparing scenarios beyond standard neutron star — i.e., assuming strongly interacting matter and general relativity — becomes increasingly important. In this work, we perform a Bayesian analysis of different scenarios capable of explaining current and future measurements...
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