Resummed lattice QCD equation of state at finite baryon density: strangeness neutrality and beyond

TL;DR

This paper develops a resummed lattice QCD equation of state at finite baryon density, incorporating strangeness neutrality, and provides results across a range of temperatures and chemical potentials, extending previous methods.

Contribution

It generalizes the resummation scheme to include non-zero strangeness chemical potential and explores the equation of state along the strangeness neutrality line at finite baryon density.

Findings

Results up to μ_B/T ≤ 3.5 on the strangeness neutral line

Continuum extrapolation using multiple lattice spacings

Extrapolation to small non-zero strangeness-to-baryon ratio R

Abstract

We calculate a resummed equation of state with lattice QCD simulations at imaginary chemical potentials. This work presents a generalization of the scheme introduced in 2102.06660 to the case of non-zero $\mu_S$, focusing on the line of strangeness neutrality. We present results up to $\mu_B/T \leq 3.5$ on the strangeness neutral line $\left\langle S \right\rangle = 0$ in the temperature range $130 \rm{MeV} \leq T \leq 280 \rm{MeV}$. We also extrapolate the finite baryon density equation of state to small non-zero values of the strangeness-to-baryon ratio $R=\left\langle S \right\rangle / \left\langle B \right\rangle$. We perform a continuum extrapolation using lattice simulations of the 4stout-improved staggered action with 8, 10, 12 and 16 timeslices.