Binary neutron star mergers in massive scalar-tensor theory: Properties of postmerger remnants

IF 5 2区物理与天体物理 Q1 Physics and Astronomy Physical Review D Pub Date : 2024-11-08 DOI:10.1103/physrevd.110.104018

Alan Tsz-Lok Lam, Hao-Jui Kuan, Masaru Shibata, Karim Van Aelst, Kenta Kiuchi

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Abstract

We investigate the properties of postmerger remnants of binary neutron star mergers in the framework of Damour–Esposito-Farese-type scalar-tensor theory of gravity with a massive scalar field by numerical relativity simulation. It is found that the threshold mass for prompt collapse is raised in the presence of the excited scalar field. Our simulation results also suggest the existence of a long-lived

𝜙

mode in hypermassive neutron stars due to the presence of the massive scalar field that enhances the quasiradial oscillation in the remnant. We investigate the descalarization condition in hypermassive neutron stars and discover a distinctive signature in postmerger gravitational waves.

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大质量标量张量理论中的双中子星合并：合并后残余物的特性

我们在带有大质量标量场的达穆尔-埃斯波西托-法瑞斯（Damour-Esposito-Farese）型引力标量张量理论框架内，通过数值相对论模拟研究了双中子星合并后残余物的性质。结果发现，在受激标量场存在的情况下，迅速坍缩的临界质量会提高。我们的模拟结果还表明，由于大质量标量场的存在，超大质量中子星中存在一个长寿命的𝜙模式，它增强了残余中子星的类弧振荡。我们研究了超大质量中子星中的去钙化条件，并在合并后引力波中发现了一个独特的特征。

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来源期刊

Physical Review D 物理-天文与天体物理

CiteScore

9.20

自引率

36.00%

发文量

审稿时长

2 months

期刊介绍： Physical Review D (PRD) is a leading journal in elementary particle physics, field theory, gravitation, and cosmology and is one of the top-cited journals in high-energy physics. PRD covers experimental and theoretical results in all aspects of particle physics, field theory, gravitation and cosmology, including: Particle physics experiments, Electroweak interactions, Strong interactions, Lattice field theories, lattice QCD, Beyond the standard model physics, Phenomenological aspects of field theory, general methods, Gravity, cosmology, cosmic rays, Astrophysics and astroparticle physics, General relativity, Formal aspects of field theory, field theory in curved space, String theory, quantum gravity, gauge/gravity duality.