Borsányi S, Fodor Z, Guenther J N, Kara R, Katz S D, Parotto P, Pásztor A, Ratti C, Szabó K K
University of Wuppertal, Department of Physics, Wuppertal D-42119, Germany.
Pennsylvania State University, Department of Physics, State College, Pennsylvania 16801, USA.
Phys Rev Lett. 2021 Jun 11;126(23):232001. doi: 10.1103/PhysRevLett.126.232001.
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 μ_{B}/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.
在本信函中，我们介绍了一种用于将量子色动力学（QCD）状态方程外推到有限化学势的新颖方案，该方案具有显著改善的收敛特性，并使我们能够将其适用范围扩展到前所未有的高重子化学势。我们给出了新展开系数的连续统外推晶格结果，并展示了高达μ_B/T≤3.5时的热力学可观测量。这种新颖的展开方法不存在传统泰勒展开方法所具有的缺点，例如用有限数量的系数进行这种展开时固有的困难以及影响从晶格计算确定的泰勒系数的低信噪比。
