Five-dimensional compact stars in Einstein-Gauss-Bonnet gravity

IF 2.5 3区 物理与天体物理 Q2 PHYSICS, PARTICLES & FIELDS Nuclear Physics B Pub Date : 2024-10-09 DOI:10.1016/j.nuclphysb.2024.116702
Juan M.Z. Pretel , Ayan Banerjee , Anirudh Pradhan
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Abstract

Within the framework of Einstein-Gauss-Bonnet theory in five-dimensional spacetime (5D EGB), we derive the hydrostatic equilibrium equations and solve them numerically to obtain neutron stars for both isotropic and anisotropic distribution of matter. The mass-radius relations are obtained for SLy equation of state, which describes both the solid crust and the liquid core of neutron stars, and for a wide range of the Gauss-Bonnet coupling parameter α. More specifically, we find that the contribution of the Gauss-Bonnet term leads to substantial deviations from Einstein gravity. We also discuss that after a certain value of α, the theory admits higher maximum masses compared with general relativity, however, the causality condition is violated in the high-mass region. Finally, our results are compared with the recent observations data on mass-radius diagram.
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爱因斯坦-高斯-波奈引力中的五维紧凑星体
在五维时空(5D EGB)的爱因斯坦-高斯-波内特理论框架内,我们推导了静水平衡方程,并通过数值求解得到了物质各向同性和各向异性分布的中子星。我们得到了描述中子星固态外壳和液态内核的 SLy 状态方程的质量-半径关系,以及高斯-波内特耦合参数 α 的宽范围。我们还讨论了在α达到一定值之后,与广义相对论相比,该理论允许更高的最大质量,然而,在高质区违反了因果关系条件。最后,我们将研究结果与最近的质量半径图观测数据进行了比较。
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来源期刊
Nuclear Physics B
Nuclear Physics B 物理-物理:粒子与场物理
CiteScore
5.50
自引率
7.10%
发文量
302
审稿时长
1 months
期刊介绍: Nuclear Physics B focuses on the domain of high energy physics, quantum field theory, statistical systems, and mathematical physics, and includes four main sections: high energy physics - phenomenology, high energy physics - theory, high energy physics - experiment, and quantum field theory, statistical systems, and mathematical physics. The emphasis is on original research papers (Frontiers Articles or Full Length Articles), but Review Articles are also welcome.
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