Extreme Compactness, Extreme Gravity: Higher-Derivative Corrections to ECOs
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arXiv
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| Format: | Preprint |
| Published: |
2025
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| _version_ | 1866912375626530816 |
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| author | Mehta, Madhur |
| author_facet | Mehta, Madhur |
| contents | Higher-derivative gravity theories offer insights into the behavior of extremely compact objects (ECOs). Focusing on Gauss-Bonnet (GB) and Einstein-dilaton-Gauss-Bonnet (EdGB) gravity, we derive the compactness scale in these models and demonstrate how higher-curvature corrections lead to deviations from the standard ECO compactness scale. The corrections are of order $α/r_0^2$ in EGB gravity and $α^2/r_0^4$ in EdGB gravity, where $α$ is the coupling constant and $r_0$ is the horizon radius corresponding to the mass of the ECO. Observational constraints suggest these effects could be significant in certain astrophysical systems, providing a new perspective on the nature of extremely compact objects in models of modified gravity. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2505_09049 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Extreme Compactness, Extreme Gravity: Higher-Derivative Corrections to ECOs Mehta, Madhur High Energy Physics - Theory General Relativity and Quantum Cosmology Higher-derivative gravity theories offer insights into the behavior of extremely compact objects (ECOs). Focusing on Gauss-Bonnet (GB) and Einstein-dilaton-Gauss-Bonnet (EdGB) gravity, we derive the compactness scale in these models and demonstrate how higher-curvature corrections lead to deviations from the standard ECO compactness scale. The corrections are of order $α/r_0^2$ in EGB gravity and $α^2/r_0^4$ in EdGB gravity, where $α$ is the coupling constant and $r_0$ is the horizon radius corresponding to the mass of the ECO. Observational constraints suggest these effects could be significant in certain astrophysical systems, providing a new perspective on the nature of extremely compact objects in models of modified gravity. |
| title | Extreme Compactness, Extreme Gravity: Higher-Derivative Corrections to ECOs |
| topic | High Energy Physics - Theory General Relativity and Quantum Cosmology |
| url | https://arxiv.org/abs/2505.09049 |