### Conveners

#### QCD at high temperature: I

- Chihiro Sasaki

#### QCD at high temperature: II

- Massimo D'Elia (University of Pisa)

The equation of state (EoS) in $2+1$ flavor QCD has recently been established in the continuum limit at the physical quark masses in ab initio lattice QCD calculations. The HotQCD collaboration result provides the EoS in the temperature range from $130$ to $400$ MeV. We extend the HotQCD equation of state to higher temperatures. We utilize the Highly Improved Staggered Quarks (HISQ) action. We...

We study spatial isovector meson correlators in $n_f=2$ QCD with dynamical domain-wall fermions on $32^3\times 8$ lattices at temperatures $T=220-380$ MeV. We measure the correlators of all spin-one ($J=1$) isovector operators. We observe an approximate degeneracy of all considered correlators with increasing temperature. This approximate degeneracy suggests emergent $SU(2)_{CS}$ and...

Understanding the properties of strong interaction matter with its physical

spectrum of light and strange quarks near the pseudo-critical temperature

of (2+1)-flavor QCD is one of the central goals of high energy nuclear

physics. It generally is expected that the analytic crossover transition in

QCD is sensitive to properties of the true chiral PHASE transition at

vanishing quark masses [1,2]....

In this talk we will study the relaxation coefficients $\tau_\pi$ and $\tau_J$ of the shear stress tensor $\pi^{\mu\nu}$ and the light quark current $J$ respectively. These are second-order transport coefficients which can be determined in perturbation theory. After reviewing the perturbative kinetic theory framework that has been recently used to determine their respective first-order...

Understanding the microscopic properties of the hot and dense QCD matter produced at RHIC and the LHC is a critical task for heavy-ion physics. Toward this end, we have developed a non-perturbative microscopic approach to study the bulk, transport and spectral properties of the quark-gluon plasma (QGP) [1-2], treating light, heavy and static partons in a unified framework. Starting from a...

Motivated by the recent lattice study by the FASTSUM collaboration [1],

thermal masses of the baryon parity-doublers are explored for

various pion masses [2]. A general trend of the octet and decuplet

parity-doublers is consistent to the results in [1], whereas their

hyperon masses are modified to a large extent for the physical pion mass.

We further investigate the fluctuations and...

The behaviour of strange baryons in the hadronic gas and the quark-gluon plasma gives essential insight into chiral symmetry restoration and parity doubling, and has direct consequences for phenomenology, e.g. via the hadron resonance gas. We present results obtained using nonperturbative lattice simulations, employing the FASTSUM anisotropic Nf=2+1 ensembles.

A new precision lattice simulation set is analyzed for the equation of state

to sixth order. We discuss the role of strangeness neturality and the

range of validity of the extrapolation strategy. We calculate the pressure,

trace anomaly, energy and entropy densitiy and the baryon number in the range

up to mu/T < 2. We achieve improved precision by combining the technique of

analitcal...

In this work we discuss the phenomenological applications of non-equilibrium hydrodynamical attractors to transport phenomena in fluid dynamics. We study the late-time behaviour of a relativistic fluid undergoing Bjorken flow whose microscopic description is given in terms of the Boltzmann equation with a time-dependent relaxation time. The mathematical problem of solving the Boltzmann...

This talk is based on 1711.01472 in which the longitudinal electric conductivity of hot and dense magnetized quark matter has been computed with full Landau level resummation which requires several nontrivial theoretical techniques. In contrast to the lowest Landau level approximation, there is no singularity in the massless limit, and we find that the resultant electric conductivity is...

There are at least three sources of cosmic quarks in the universe. One, the quark

nuggets which may survive beyond a certain baryon number during the phase

transition from quarks to hadrons microseconds after the big bang. These quark

nuggets can very well be candidate of cold dark matter and these nuggets consist of

strange quarks.

Second, the interior of the neutron star may well be made of...