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Emergence of Microphysical Bulk Viscosity in Binary Neutron Star Postmerger Dynamics

التفاصيل البيبلوغرافية
العنوان: Emergence of Microphysical Bulk Viscosity in Binary Neutron Star Postmerger Dynamics
المؤلفون: Elias R. Most, Alexander Haber, Steven P. Harris, Ziyuan Zhang, Mark G. Alford, Jorge Noronha
المصدر: The Astrophysical Journal Letters, Vol 967, Iss 1, p L14 (2024)
بيانات النشر: IOP Publishing, 2024.
سنة النشر: 2024
المجموعة: LCC:Astrophysics
مصطلحات موضوعية: Neutron stars, Nuclear astrophysics, Nuclear physics, Gravitational waves, Astrophysics, QB460-466
الوصف: In nuclear matter in isolated neutron stars, the flavor content (e.g., proton fraction) is subject to weak interactions, establishing flavor ( β -)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.
نوع الوثيقة: article
وصف الملف: electronic resource
اللغة: English
تدمد: 2041-8213
2041-8205
Relation: https://doaj.org/toc/2041-8205
DOI: 10.3847/2041-8213/ad454f
URL الوصول: https://doaj.org/article/2f2fcdbbafd0432f8e6f407defb122c4
رقم الانضمام: edsdoj.2f2fcdbbafd0432f8e6f407defb122c4
قاعدة البيانات: Directory of Open Access Journals
الوصف
تدمد:20418213
20418205
DOI:10.3847/2041-8213/ad454f