Lattice QCD Equation of State at Finite Chemical Potential from an Alternative Expansion Scheme

Borsányi, S. and Fodor, Zoltán and Guenther, J.N. and Kara, R. and Katz, Sándor and Pásztor, Attila and Szabó, K.K. (2021) Lattice QCD Equation of State at Finite Chemical Potential from an Alternative Expansion Scheme. PHYSICAL REVIEW LETTERS, 126 (23). ISSN 0031-9007

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Abstract

In this Letter, we introduce a novel scheme for extrapolating the equation of state of QCD to finite chemical potential that features considerably improved convergence properties and allows us to extend its reach to unprecedentedly high baryonic chemical potentials. We present continuum extrapolated lattice results for the new expansion coefficients and show the thermodynamic observables up to μB=T ≤ 3.5. This novel expansion does not suffer from the shortcomings that characterize the traditional Taylor expansion method, such as difficulties inherent in performing such an expansion with a limited number of coefficients and the poor signal-to-noise ratio that affects Taylor coefficients determined from lattice calculations.

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