Nuclear Equation of State for Arbitrary Proton Fraction and Temperature Based on Chiral Effective Field Theory and a Gaussian Process Emulator

被引：41

作者：

Keller, J. ^{[1
,2
]}

Hebeler, K. ^{[1
,2
,3
]}

Schwenk, A. ^{[1
,2
,3
]}

机构：

[1] Tech Univ Darmstadt, Dept Phys, D-64289 Darmstadt, Germany

[2] GSI Helmholtzzentrum Schwerionenforsch GmbH, ExtreMe Matter Inst EMMI, D-64291 Darmstadt, Germany

[3] Max Planck Inst Kernphys, Saupfercheckweg 1, D-69117 Heidelberg, Germany

来源：

PHYSICAL REVIEW LETTERS | 2023年 / 130卷 / 07期

关键词：

OF-STATE; CONSTRAINTS; PHYSICS;

D O I：

10.1103/PhysRevLett.130.072701

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We calculate the equation of state of asymmetric nuclear matter at finite temperature based on chiral effective field theory interactions to next-to-next-to-next-to-leading order. Our results assess the theoretical uncertainties from the many-body calculation and the chiral expansion. Using a Gaussian process emulator for the free energy, we derive the thermodynamic properties of matter through consistent derivatives and use the Gaussian process to access arbitrary proton fraction and temperature. This enables a first nonparametric calculation of the equation of state in beta equilibrium, and of the speed of sound and the symmetry energy at finite temperature. Moreover, our results show that the thermal part of the pressure decreases with increasing densities.

引用

页数：6

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