Isothermal and isentropic speed of sound in (2+1)-flavor QCD at non-zero baryon chemical potential

Abstract

Recently interest in calculations of the speed of sound in QCD under conditions like constant temperature $c_T^2$ or constant entropy per net baryon number $c_s^2$ arose in the discussion of experimental results coming from heavy ion experiments. It has been stressed that the former in particular is closely related to higher order cumulants of conserved charge fluctuations that are calculated in lattice QCD. We present here results on $c_T^2$ and $c_s^2$ and compare results at vanishing strangeness chemical potential and vanishing net strangeness number with hadron resonance gas model calculations. We stress the difference of both observables at low temperature arising from the light meson sector, which does not contribute to $c_T^2$.

arXiv comment10 pages, 4 figures, presented at the 39th International Symposium on Lattice Field Theory. For the HotQCD Collaboration

References in corpus (24)

• The equation of state in (2+1)-flavor QCD
• The chiral and deconfinement aspects of the QCD transition
• Full result for the QCD equation of state with 2+1 flavors
• Chiral crossover in QCD at zero and non-zero chemical potentials
• The QCD Equation of State to $\mathcal{O}({\mu }_B^6)$ from Lattice QCD
• Quarkyonic Matter and Neutron Stars
• Hydrodynamics near the QCD Phase Transition: Looking for the Longest-Lived Fireball
• Susceptibilities and speed of sound from PNJL model
• Thermodynamics of (2+1)-flavor QCD: Confronting Models with Lattice Studies
• Skewness, kurtosis and the 5th and 6th order cumulants of net baryon-number distributions from lattice QCD confront high-statistics STAR data
• Transport coefficients from the Nambu-Jona-Lasinio model for $SU(3{)}_f$
• Transport coefficients from the Nambu-Jona-Lasinio model for $SU(3{)}_f$
• Limiting masses and radii of neutron stars and their implications
• Trace anomaly as signature of conformality in neutron stars
• Taylor expansions and Padé approximants for cumulants of conserved charge fluctuations at non-vanishing chemical potentials
• Second order cumulants of conserved charge fluctuations revisited I. Vanishing chemical potentials
• Estimating transport coefficients in hot and dense quark matter
• Transport coefficients in Polyakov quark meson coupling model: a relaxation time approximation
• HotQCD on Multi-GPU Systems
• Impact of quark quasiparticles on transport coefficients in hot QCD
• Thermodynamic properties and transport coefficients of QCD matter within the non-extensive Polyakov-Nambu-Jona-Lasinio model
• Isentropic evolution of the matter in heavy-ion collisions and the search for the critical endpoint
• Thermodynamics of quark-gluon plasma at finite baryon density
• The speed of sound in QGP and SU(3) Yang-Mills theory