Compactification of Anisotropies in Einstein-Scalar-Gauss-Bonnet Cosmology
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arXiv
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| Natura: | Preprint |
| Pubblicazione: |
2025
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| author | Giacomini, Alex Paliathanasis, Andronikos Toporensky, Alexey |
| author_facet | Giacomini, Alex Paliathanasis, Andronikos Toporensky, Alexey |
| contents | We investigate the evolution of anisotropies in Einstein-Gauss-Bonnet theory with a scalar field coupled to the Gauss-Bonnet term. Specifically, we examine the simplest scenario in which the scalar field lacks a kinetic term, and its kinetic contribution arises from an integration by parts of the Gauss-Bonnet scalar. We consider four- and five-dimensional anisotropic spacetimes, focusing on Bianchi I and extended Bianchi I geometries. Our study reveals that the asymptotic solutions correspond to locally symmetric spacetimes where at least two scale factors exhibit analogous behavior or, alternatively, to isotropic configurations where all scale factors evolve identically. Additionally, we discuss the effects of a cosmological constant, finding that the presence of the cosmological constant does not lead to an isotropic universe. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2503_07260 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Compactification of Anisotropies in Einstein-Scalar-Gauss-Bonnet Cosmology Giacomini, Alex Paliathanasis, Andronikos Toporensky, Alexey General Relativity and Quantum Cosmology High Energy Physics - Theory Mathematical Physics We investigate the evolution of anisotropies in Einstein-Gauss-Bonnet theory with a scalar field coupled to the Gauss-Bonnet term. Specifically, we examine the simplest scenario in which the scalar field lacks a kinetic term, and its kinetic contribution arises from an integration by parts of the Gauss-Bonnet scalar. We consider four- and five-dimensional anisotropic spacetimes, focusing on Bianchi I and extended Bianchi I geometries. Our study reveals that the asymptotic solutions correspond to locally symmetric spacetimes where at least two scale factors exhibit analogous behavior or, alternatively, to isotropic configurations where all scale factors evolve identically. Additionally, we discuss the effects of a cosmological constant, finding that the presence of the cosmological constant does not lead to an isotropic universe. |
| title | Compactification of Anisotropies in Einstein-Scalar-Gauss-Bonnet Cosmology |
| topic | General Relativity and Quantum Cosmology High Energy Physics - Theory Mathematical Physics |
| url | https://arxiv.org/abs/2503.07260 |