The QCD equation of state to O(μ_B⁴)

2014/12/21 by Prasad Hegde, Hegde, Prasad · 1 citation
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Lattice (hep-lat) #High Energy Physics - Phenomenology (hep-ph) #High-Energy Particle Collisions Research #Nuclear Theory (nucl-th) #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions

paper · pdf · doi:10.48550/arxiv.1412.6727

openalex publication_date 2014/12/21 · openalex created_date 2022/08/31 · openalex updated_date 2026/07/28

Abstract

We present results from an ongoing calculation of the QCD equation of state at finite baryon chemical potential μ_B. We use the method of Taylor expansions to circumvent the sign problem and calculate the expansion coefficients to sixth order using HISQ fermions. We work at two lattice spacings, namely N_τ=6 and 8 and, though we do not take the continuum limit, demonstrate that cutoff effects remain under control. We also use our results to construct an equation of state along the freeze-out curve. Using our sixth-order results as a cross-check, we demonstrate that our fourth-order equation of state is suitable for the modeling of dense matter created in heavy ion collisions with center-of-mass energies down to s_NN^1/2∼20 GeV.

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• Thermodynamics of strong-interaction matter from Lattice QCD

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