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| Main Authors: | , , , , , |
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| Format: | Preprint |
| Published: |
2023
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2312.01406 |
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| _version_ | 1866913144931090432 |
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| author | Li, Shoulong Lü, H. Gao, Yong Xu, Rui Shao, Lijing Yu, Hongwei |
| author_facet | Li, Shoulong Lü, H. Gao, Yong Xu, Rui Shao, Lijing Yu, Hongwei |
| contents | Probing gravity in its strongest regime is a central goal of modern physics, as the nature of the most compact objects reflects fundamental aspects of Einstein's theory of general relativity (GR). In GR, black holes are regarded as the most compact objects in the Universe. Here, for the first time, we demonstrate that stable stellar configurations more compact than black holes can arise when neutron-star equations of state are embedded in quasi-topological gravity, a class of higher-curvature extensions of GR. We construct such ultra-compact stars, analyze their macroscopic properties, and establish their stability against radial perturbations, confirming their physical plausibility. We further identify potential observational signatures to distinguish these stars from black holes, most notably gravitational-wave echoes whose detectability could provide direct evidence of physics beyond Einstein's GR in the strong-field regime. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2312_01406 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Neutron stars more compact than black holes as a probe of strong-field gravity Li, Shoulong Lü, H. Gao, Yong Xu, Rui Shao, Lijing Yu, Hongwei General Relativity and Quantum Cosmology Probing gravity in its strongest regime is a central goal of modern physics, as the nature of the most compact objects reflects fundamental aspects of Einstein's theory of general relativity (GR). In GR, black holes are regarded as the most compact objects in the Universe. Here, for the first time, we demonstrate that stable stellar configurations more compact than black holes can arise when neutron-star equations of state are embedded in quasi-topological gravity, a class of higher-curvature extensions of GR. We construct such ultra-compact stars, analyze their macroscopic properties, and establish their stability against radial perturbations, confirming their physical plausibility. We further identify potential observational signatures to distinguish these stars from black holes, most notably gravitational-wave echoes whose detectability could provide direct evidence of physics beyond Einstein's GR in the strong-field regime. |
| title | Neutron stars more compact than black holes as a probe of strong-field gravity |
| topic | General Relativity and Quantum Cosmology |
| url | https://arxiv.org/abs/2312.01406 |