Neutron stars in extended scalar-Gauss–Bonnet gravity: the richness of the solution spectrum

IF 4.8 2区物理与天体物理 Q2 PHYSICS, PARTICLES & FIELDS

The European Physical Journal C Pub Date : 2024-12-27 DOI:10.1140/epjc/s10052-024-13704-7

Kalin V. Staykov, Peter Y. Yordanov, Daniela D. Doneva, Stoytcho S. Yazadjiev

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Abstract

Neutron stars are natural laboratories for testing gravity in the strong field regime. That is why the full spectrum of neutron star solutions in different modified theories should be thoroughly studied. Among the most natural modifications of general relativity are the theories in which additional scalar degrees of freedom are present. That is why scalar-tensor theories like Brans–Dicke and Damour–Esposito–Farese theories, as well as their extensions such as scalar-Gauss–Bonnet gravity, attracted attention throughout the years. In the present work, we combine those theory families and explore extensively the neutron star solution space in their realm. We identify qualitative new behavior of the solutions, including the existence of new types of phase transitions and new branches of solutions present only for high neutron star masses. Due to the peculiarities of the solutions, they can not be easily mimicked by a simple change of the equation of state.

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扩展标量-高斯-邦纳引力下的中子星：溶液光谱的丰富性

中子星是测试强磁场下重力的天然实验室。这就是为什么在不同修正理论中中子星解的全谱应该被彻底研究的原因。在广义相对论最自然的修正中，存在额外的标量自由度的理论。这就是为什么标量张量理论，如Brans-Dicke和Damour-Esposito-Farese理论，以及它们的扩展，如标量-高斯-博内引力，多年来吸引了人们的注意。在本工作中，我们将这些理论族结合起来，在它们的领域内对中子星解空间进行了广泛的探索。我们确定了解的定性新行为，包括新类型相变的存在和只存在于高中子星质量的解的新分支。由于解的特殊性，不能简单地通过改变状态方程来模拟它们。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

The European Physical Journal C 物理-物理：粒子与场物理

CiteScore

8.10

自引率

15.90%

发文量

1008

审稿时长

2-4 weeks

期刊介绍： Experimental Physics I: Accelerator Based High-Energy Physics Hadron and lepton collider physics Lepton-nucleon scattering High-energy nuclear reactions Standard model precision tests Search for new physics beyond the standard model Heavy flavour physics Neutrino properties Particle detector developments Computational methods and analysis tools Experimental Physics II: Astroparticle Physics Dark matter searches High-energy cosmic rays Double beta decay Long baseline neutrino experiments Neutrino astronomy Axions and other weakly interacting light particles Gravitational waves and observational cosmology Particle detector developments Computational methods and analysis tools Theoretical Physics I: Phenomenology of the Standard Model and Beyond Electroweak interactions Quantum chromo dynamics Heavy quark physics and quark flavour mixing Neutrino physics Phenomenology of astro- and cosmoparticle physics Meson spectroscopy and non-perturbative QCD Low-energy effective field theories Lattice field theory High temperature QCD and heavy ion physics Phenomenology of supersymmetric extensions of the SM Phenomenology of non-supersymmetric extensions of the SM Model building and alternative models of electroweak symmetry breaking Flavour physics beyond the SM Computational algorithms and tools...etc.