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arXiv 1109.0928gr-qcastro-ph.HEhep-ph
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引力替代理论中的致密星。Einstein-Dilaton-Gauss-Bonnet引力

Compact stars in alternative theories of gravity. Einstein-Dilaton-Gauss-Bonnet gravity

Paolo Pani, Emanuele Berti, Vitor Cardoso, Jocelyn Read

摘要:

我们开发了一个理论框架来研究缓慢旋转的致密星在一个相当一般的类替代理论的引力,最终目标是调查约束的替代理论从电磁和引力波观测致密星。我们的拉格朗日量包括标量张量理论(和间接的f(R)理论)以及耦合到二次曲率不变量的标量场模型的特殊情况。作为第一个应用的形式主义,我们讨论(首次在文献中)在Einstein-Dilaton-Gauss-Bonnet引力的紧凑型恒星。我们表明,紧凑的对象与典型的中子星的中心密度不存在的耦合常数的理论的某些值。事实上,致密星的存在性和稳定性比黑洞解的存在性对理论提出了更严格的限制。这项工作是系统地排除(可能使用贝叶斯模型选择)与致密星的天体物理观测不相容的理论的计划的第一步。

英文摘要:

We develop a theoretical framework to study slowly rotating compact stars in a rather general class of alternative theories of gravity, with the ultimate goal of investigating constraints on alternative theories from electromagnetic and gravitational-wave observations of compact stars. Our Lagrangian includes as special cases scalar-tensor theories (and indirectly f(R) theories) as well as models with a scalar field coupled to quadratic curvature invariants. As a first application of the formalism, we discuss (for the first time in the literature) compact stars in Einstein-Dilaton-Gauss-Bonnet gravity. We show that compact objects with central densities typical of neutron stars cannot exist for certain values of the coupling constants of the theory. In fact, the existence and stability of compact stars sets more stringent constraints on the theory than the existence of black hole solutions. This work is a first step in a program to systematically rule out (possibly using Bayesian model selection) theories that are incompatible with astrophysical observations of compact stars.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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