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Towards New Constraints in Extended Theories of Gravity: Cosmography and Gravitational-Wave Signals from Neutron Stars

机译:引力引力理论中的新约束:宇宙照相术和来自中子星的引力波信号

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Combined cosmological, astrophysical and numerical tests may shed some light on the viability of theories of gravity beyond Einsteinian relativity. In this letter, we present two different techniques providing complementary ways of testing new physics beyond the Λ CDM cosmological paradigm. First, we shall present some of the latest progress and shortcomings in the cosmographic model-independent approach for several modified gravity theories using supernovae catalogues, baryonic acoustic oscillation data and H ( z ) differential age compilations. Second, we shall show how once the Einsteinian paradigm is abandoned, the phenomenology of neutron stars changes dramatically since neutron-star masses can be much larger than their General Relativity counterparts. Consequently, the total energy available for radiating gravitational waves could be of the order of several solar masses, and thus a merger of these stars constitutes a privileged wave source. Unfortunately at the present time our persisting lack of understanding in the strong interaction sector does not allow to distinguish the alternative theories from the usual General Relativity predictions.
机译:结合了宇宙学,天体物理学和数值测试,可能会为爱因斯坦相对论以外的引力理论的可行性提供一些启示。在这封信中,我们介绍了两种不同的技术,它们提供了超越CDM宇宙学范式的新物理测试的补充方法。首先,我们将介绍使用超新星目录,重子声振荡数据和H(z)差分年龄汇编的几种修改后的重力理论的宇宙模型独立方法中的一些最新进展和不足。其次,我们将展示一旦爱因斯坦范式被抛弃,中子星的现象将发生巨大变化,因为中子星的质量可能比广义相对论的质量大得多。因此,可用于辐射引力波的总能量可能约为几个太阳质量,因此,这些恒星的合并构成了优先的波源。不幸的是,目前我们在强大的互动领域仍然缺乏了解,无法将替代理论与通常的相对论预测区分开。

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