Emergence of Microphysical Bulk Viscosity in Binary Neutron Star Postmerger Dynamics

被引：25

作者：

Most, Elias R. ^{[1
,2
]}

Haber, Alexander ^{[3
]}

Harris, Steven P. ^{[4
]}

Zhang, Ziyuan ^{[3
,5
]}

Alford, Mark G. ^{[3
]}

Noronha, Jorge ^{[6
,7
]}

机构：

[1] CALTECH, TAPIR, Mailcode 253-37, Pasadena, CA 91109 USA

[2] CALTECH, Walter Burke Inst Theoret Phys, Pasadena, CA 91125 USA

[3] Washington Univ, Phys Dept, St Louis, MO 63130 USA

[4] Univ Washington, Inst Nucl Theory, Seattle, WA 98195 USA

[5] Washington Univ, McDonnell Ctr Space Sci, St Louis, MO 63130 USA

[6] Univ Illinois, Illinois Ctr Adv Studies Universe, Urbana, IL 61801 USA

[7] Univ Illinois, Dept Phys, Urbana, IL 61801 USA

来源：

ASTROPHYSICAL JOURNAL LETTERS | 2024年 / 967卷 / 01期

基金：

美国国家科学基金会;

关键词：

EQUATION-OF-STATE; GRAVITATIONAL-WAVE SIGNAL; INFRARED LIGHT CURVES; MASS EJECTION; ELECTROMAGNETIC COUNTERPART; RADIATION-HYDRODYNAMICS; PHASE-TRANSITIONS; THRESHOLD MASS; MAXIMUM MASS; BETA EQUILIBRIUM;

D O I：

10.3847/2041-8213/ad454f

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

In nuclear matter in isolated neutron stars, the flavor content (e.g., proton fraction) is subject to weak interactions, establishing flavor (beta-)equilibrium. However, there can be deviations from this equilibrium during the merger of two neutron stars. We study the resulting out-of-equilibrium dynamics during the collision by incorporating direct and modified Urca processes (in the neutrino-transparent regime) into general-relativistic hydrodynamics simulations with a simplified neutrino transport scheme. We demonstrate how weak-interaction-driven bulk viscosity in postmerger simulations can emerge and assess the bulk viscous dynamics of the resulting flow. We further place limits on the impact of the postmerger gravitational-wave strain. Our results show that weak-interaction-driven bulk viscosity can potentially lead to a phase shift of the postmerger gravitational-wave spectrum, although the effect is currently on the same level as the numerical errors of our simulation.

引用

页数：11

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