Update on (2+1+1)-flavor QCD equation of state

TL;DR

This paper presents preliminary lattice QCD calculations of the equation of state for 2+1+1 flavors, highlighting the significant impact of charm quarks on pressure at high temperatures above 300 MeV.

Contribution

It provides new lattice QCD results for the 2+1+1 flavor equation of state using HISQ action across multiple lattice sizes, emphasizing charm quark effects.

Findings

Charm quarks significantly contribute to pressure above 300 MeV.

Results obtained on lattices with various temporal extents.

Preliminary data indicating temperature dependence of the equation of state.

Abstract

We report on preliminary results from the calculations of the QCD equation of state for 2+1+1 flavors using HISQ action. The calculations are performed on lattices with temporal extents $N_{\tau}=6,~8,~10$, and $12$ and aspect ratio $N_{\sigma}/N_{\tau}=4$. We find that there is a significant contribution to the pressure from charm quarks at temperatures $T> 300$ MeV.