Conveners
QCD at nonzero temperature and density
- David Clarke
QCD at nonzero temperature and density
- Jana N. Guenther (University of Wuppertal)
QCD at nonzero temperature and density
- Ivan Horvath
QCD at nonzero temperature and density
- Etsuko Itou
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Daniel Unterhuber (University of Graz)30/07/2026, 14:002QCD at nonzero temperature and densityContributed talk
This talk presents the results of lattice simulations of quantum chromodynamics (QCD) above the crossover temperature and at unprecedentedly high baryon densities. Lattice QCD calculations at finite chemical potential suffer from the sign problem, which prevents the use of conventional importance-sampling methods such as the Hybrid Monte Carlo algorithm. In this study, the Complex Langevin...
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Shinji Ejiri (Niigata University)30/07/2026, 14:20QCD at nonzero temperature and densityContributed talk
We investigate the phase structure and equations of state in lattice gauge theory at finite temperature and finite density, focusing on the canonical partition function obtained by expanding the grand partition function in terms of particle number. We demonstrate that when quark masses are heavy and the hopping parameter expansion of the quark determinant is applicable, the complex phase of...
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Marco Aliberti (University of Parma & INFN)30/07/2026, 14:401QCD at nonzero temperature and densityContributed talk
The sign problem interdicts lattice simulations at real non-zero values of the chemical potential: the computation of observables at imaginary values is a popular way out, but to make predictions for QCD at finite density one is left with the problem of the analytic continuation to the real axis, given a discrete set of measurements on the imaginary one. The Parma group has developed a method...
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Piyush Kumar (Bergische Universität Wuppertal)30/07/2026, 15:001QCD at nonzero temperature and densityContributed talk
Contour-based extrapolation of thermodynamic observables to finite chemical potential is known to overcome the shortcomings of Taylor series extrapolation and to extend the reach in the finite density region. Two such schemes are the T-prime expansion, which uses contours of constant baryon density, and a recently proposed scheme using contours of constant entropy. However, a detailed...
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Emmanuel Ortiz Pacheco (Eötvös Loránd University)30/07/2026, 15:201QCD at nonzero temperature and densityContributed talk
We investigate contour deformation strategies for alleviating the finite-density sign problem in the heavy-dense limit of QCD in two, three, and four dimensions. To reduce the number of integration variables, we work in Polyakov gauge and consider complex deformations of the Polyakov loop eigenvalues. We study approaches based on holomorphic flow equations as well as numerical optimization,...
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Paulo Silva30/07/2026, 16:101QCD at nonzero temperature and density
The lattice gluon propagator at finite temperature is computed in the recently introduced center-symmetric Landau gauge in pure Yang-Mills theory. Recent works in the continuum, e.g. [1] show that the gluon propagator is degenerate along the diagonal color directions in the confining phase, and becomes nondegenerate in the deconfined phase. This result allows to use the gluon propagator to...
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Eduardo Garnacho-Velasco (Eotvos Lorand University)30/07/2026, 16:302QCD at nonzero temperature and densityContributed talk
QED corrections to observables in QCD are by now well-understood at zero temperature, where QED effects are perturbative and are required for precision physics observables, such as the neutron-proton mass difference or the muon g-2, among many others. However, there are indications that at finite temperature the introduction of QED can lead to non-perturbative effects, affecting the structure...
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Mr Gergely Marko (Eotvos Lorand University, Institute of Physics)30/07/2026, 16:501QCD at nonzero temperature and densityContributed talk
At large isospin chemical potential $\mu_I$ and low temperature, QCD undergoes a second-order transition to a Bose-Einstein condensate of charged pions, whose order is encoded in the non-analytic $\mu_I$-dependence of the pressure and of the isospin density derived from it. Including dynamical photons is expected, on general grounds, to drive this transition first order. Since unequal quark...
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Etsuko Itou30/07/2026, 17:101QCD at nonzero temperature and densityContributed talk
We investigate the chemical-potential dependence of hadron masses in two-color QCD (QC$_2$D) using first-principles lattice simulations. QC$_2$D provides a useful theoretical laboratory for studying cold dense QCD matter, since it is free from the sign problem while sharing several important nonperturbative features with three-color QCD. In this work, we compute two-point correlation functions...
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Prof. Seyong Kim (Sejong University)31/07/2026, 14:001QCD at nonzero temperature and densityContributed talk
We study bottomonium and B mesons at non-zero temperature, using lattice NRQCD for bottom quarks and an ${\cal O} (a)$ improved Wilson action for $N_f = 2+1$ flavors of light quarks on anisotropic lattices. We consider two sets of FASTSUM ensembles, with an anisotropy of $\xi = 3.45$ for the B meson study and $\xi = 7.02$ for the bottomonium study. The pion mass is approximately the same,...
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Viljami Leino (U. Southern Denmark, QTC)31/07/2026, 14:201QCD at nonzero temperature and densityContributed talk
The interaction of heavy quarkonium in QGP within the potential non-relativistic QCD framework can be characterized in terms of transport coefficients related to the correlators of color electric fields connected by adjoint Wilson lines. We present a lattice calculation of these correlators with both gradient flow and multilevel algorithms and extract the relevant transport coefficients. We...
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Jorge Luis Dasilva Golan (brookhaven National Laboratory)31/07/2026, 14:402QCD at nonzero temperature and densityContributed talk
We study charmonium and bottomonium properties at nonzero temperature using lattice QCD covering temperatures in the range 153 MeV $<T<$ 305 MeV. We compute Euclidean correlation functions using both point meson operators, where the quark and antiquark fields are located at the same spatial point, and extended meson operators, where the quark and antiquark fields are spatially separated to...
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Pietro Rescigno (RIKEN R-CCS, Kobe)31/07/2026, 15:002QCD at nonzero temperature and densityContributed talk
We report on the exploration of thermal QCD with $N_f=3$ flavours of $O(a)$-improved massless Wilson fermions up to electroweak-scale temperatures. We present results on screening masses at 12 temperatures ranging from 1 GeV to 165 GeV, in several flavor non-singlet mesonic channels, including the first and second non-static Matsubara sectors with frequencies 2πT and 4πT, respectively. For...
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Kei Tohme (Kyoto University)31/07/2026, 15:201QCD at nonzero temperature and densityContributed talk
We investigate the chemical-potential ($\mu$) dependence of gluon screening masses in two-color QCD ($\mathrm{QC_2D}$) at finite density using lattice simulations.
Previous studies on this topic have reported conflicting results. One group concluded that both the electric and magnetic screening masses are independent of $\mu$, whereas another reported that the electric screening mass...
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David Clarke31/07/2026, 16:102QCD at nonzero temperature and density
Most modern lattice QCD calculations take the masses of the light quarks to be degenerate, setting $m_u=m_d$, a choice that, while not exactly physical, increases computational efficiency and lowers the complexity of simulations and analysis. For many observables, the systematic error associated with this simplification is expected to be negligible, as $\Delta m_{ud}=m_d-m_u$ is significantly...
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Jan Philipp Klinger (Goethe University Frankfurt)31/07/2026, 16:301QCD at nonzero temperature and densityContributed talk
Once the number of massless fermions exceeds a critical value $N_f^*$, many-flavour QCD enters the conformal window, where chiral symmetry remains intact in the vacuum. In lattice simulations the theory can only be probed at a finite cutoff, finite temporal extent and nonzero quark mass. The latter invariably breaks chiral symmetry and thus one generically observes a thermal chiral transition...
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Yusuke Shimada (YITP, Kyoto University)31/07/2026, 16:501QCD at nonzero temperature and densityContributed talk
Dense QCD matter is expected to exhibit color-superconducting phases, such as the color-flavor-locked (CFL) phase. In the CFL phase, the color gauge symmetry is Higgsed, and the global $U(1)_B$ baryon-number symmetry is spontaneously broken. An interesting observation is that a hadronic superfluid phase at intermediate densities realizes the same pattern of global symmetry breaking. This...
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Ivan Horvath (Nuclear Physics Institute, Řež-Prague, Czech Republic)31/07/2026, 17:101QCD at nonzero temperature and densityContributed talk
The IR phase of thermal QCD is characterized, among other things, by power singularity of Dirac spectral density at zero (power near -1), and by an unusual pattern of IR spatial dimensions. The first aspect has also been proposed for density of states in chiral orthogonal Anderson models with off-diagonal logarithmic disorder. Here we identify the root cause and the precise form of that...
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Navdeep Singh Dhindsa (TIFR Mumbai)31/07/2026, 17:301QCD at nonzero temperature and densityContributed talk
We apply the recently-developed technique of dimensional decomposition to eigenstates of chiral Anderson models. This approach provides the complete information on effective dimensions present in a spatial structure. We focus on the class of orthogonal models with logarithmic disorder in 3D, that bear interesting similarities to QCD in IR phase at the level of spectral densities.
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