Lattice QCD equation of state at finite chemical potential from an alternative expansion scheme

2021/02/12 by S. Borsanyi, Z. Fodor, J. N. Guenther +6 · 1 citation
Physics and Astronomy · #hep-lat #nucl-th

paper · pdf · doi:10.1103/physrevlett.126.232001

published as Phys. Rev. Lett. 126, 232001 (2021) · 13 pages, 10 figures

arxiv created 2021/02/12 · arxiv updated 2021/06/16

Abstract

Taylor expansion of the equation of state of QCD suffers from shortcomings at chemical potentials μ_B ≥ (2-2.5)T. First, one faces difficulties inherent in performing such an expansion with a limited number of coefficients; second, higher order coefficients determined from lattice calculations suffer from a poor signal-to-noise ratio. In this work, we present a novel scheme for extrapolating the equation of state of QCD to finite, real chemical potential that can extend its reach further than previous methods. We present continuum extrapolated lattice results for the new expansion coefficients and show the thermodynamic observables up to μ_B/T≤3.5.

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