Gravitational wave cosmology in Einstein-scalar-Gauss-Bonnet gravity
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arXiv
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| Autores principales: | , , , , , |
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| Formato: | Preprint |
| Publicado: |
2025
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| _version_ | 1866917944486789120 |
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| author | Fier, Jared Han, Henry Li, Bowen Lin, Kai Mukohyama, Shinji Wang, Anzhong |
| author_facet | Fier, Jared Han, Henry Li, Bowen Lin, Kai Mukohyama, Shinji Wang, Anzhong |
| contents | In the framework of Einstein-scalar-Gauss-Bonnet (EsGB) gravity, we systematically study gravitational waves (GWs), first produced by remote compact astrophysical sources and then propagating through the flat homogeneous and isotropic Universe at cosmic distances before arriving at detectors. Assuming that the speed $c_T$ of the spin-2 graviton is the same as that of photons, we find explicitly the stability conditions of the theory and then obtain the severest observational constraint found so far. In particular, all these conditions and constraints are satisfied, provided that $0 \leq α\dot{f}(ϕ_0) \lesssim 8.97 \times 10^{-24}$ (km), where $α{f}(ϕ)$ denotes the coupling strength between the scalar field $ϕ$ and the Gauss-Bonnet term, an over-dot represents the derivative with respect to the cosmic time, and $ϕ_0$ is the present value of $ϕ$. The trajectories for both spin-2 and spin-0 gravitons and the amplitudes of GWs along the trajectories are explicitly obtained. The amplitude of a spin-2 GW is practically indistinguishable from that of GR, while the spin-0 GWs remain almost constant during radiation- and matter-dominated epochs, and in the dark energy-dominated epoch it is proportional to the physical distance between the source and the observer. A careful analysis shows that the latter is due to the assumption $c_T = 1$. When $c_T \not= 1$ to the extent that is consistent with the stability conditions and observational constraints, the above behavior disappears. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2503_01975 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Gravitational wave cosmology in Einstein-scalar-Gauss-Bonnet gravity Fier, Jared Han, Henry Li, Bowen Lin, Kai Mukohyama, Shinji Wang, Anzhong General Relativity and Quantum Cosmology Cosmology and Nongalactic Astrophysics High Energy Physics - Phenomenology High Energy Physics - Theory In the framework of Einstein-scalar-Gauss-Bonnet (EsGB) gravity, we systematically study gravitational waves (GWs), first produced by remote compact astrophysical sources and then propagating through the flat homogeneous and isotropic Universe at cosmic distances before arriving at detectors. Assuming that the speed $c_T$ of the spin-2 graviton is the same as that of photons, we find explicitly the stability conditions of the theory and then obtain the severest observational constraint found so far. In particular, all these conditions and constraints are satisfied, provided that $0 \leq α\dot{f}(ϕ_0) \lesssim 8.97 \times 10^{-24}$ (km), where $α{f}(ϕ)$ denotes the coupling strength between the scalar field $ϕ$ and the Gauss-Bonnet term, an over-dot represents the derivative with respect to the cosmic time, and $ϕ_0$ is the present value of $ϕ$. The trajectories for both spin-2 and spin-0 gravitons and the amplitudes of GWs along the trajectories are explicitly obtained. The amplitude of a spin-2 GW is practically indistinguishable from that of GR, while the spin-0 GWs remain almost constant during radiation- and matter-dominated epochs, and in the dark energy-dominated epoch it is proportional to the physical distance between the source and the observer. A careful analysis shows that the latter is due to the assumption $c_T = 1$. When $c_T \not= 1$ to the extent that is consistent with the stability conditions and observational constraints, the above behavior disappears. |
| title | Gravitational wave cosmology in Einstein-scalar-Gauss-Bonnet gravity |
| topic | General Relativity and Quantum Cosmology Cosmology and Nongalactic Astrophysics High Energy Physics - Phenomenology High Energy Physics - Theory |
| url | https://arxiv.org/abs/2503.01975 |