Implementing F (T ) Gravity in Boltzmann Codes: A Framework for Power Spectrum Computation
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arXiv
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| Autores principales: | , , |
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| Formato: | Preprint |
| Publicado: |
2025
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| Acceso en línea: | |
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| _version_ | 1866917159387529216 |
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| author | Rugg, Robert Akalu, Shambel Abebe, Amare |
| author_facet | Rugg, Robert Akalu, Shambel Abebe, Amare |
| contents | This work investigates the nonlinearity of the power-law model of F(T) gravity, highlighting the inability of the Boltzmann solver CLASS to handle nonlinear models. As a workaround, a second-order Taylor expansion is applied to the nonlinear field equations, under the assumption that the extra degree of freedom n, which quantifies deviations from the currently favored cosmological model (ΛCDM), remains sufficiently small to preserve the key properties of the ΛCDM model. The validity of the Taylor expansion is supported by supernova data indicating n \leq 0.05, for which the power spectrum can be accurately computed within CLASS with a negligible truncation error. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2512_16404 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Implementing F (T ) Gravity in Boltzmann Codes: A Framework for Power Spectrum Computation Rugg, Robert Akalu, Shambel Abebe, Amare General Relativity and Quantum Cosmology Cosmology and Nongalactic Astrophysics This work investigates the nonlinearity of the power-law model of F(T) gravity, highlighting the inability of the Boltzmann solver CLASS to handle nonlinear models. As a workaround, a second-order Taylor expansion is applied to the nonlinear field equations, under the assumption that the extra degree of freedom n, which quantifies deviations from the currently favored cosmological model (ΛCDM), remains sufficiently small to preserve the key properties of the ΛCDM model. The validity of the Taylor expansion is supported by supernova data indicating n \leq 0.05, for which the power spectrum can be accurately computed within CLASS with a negligible truncation error. |
| title | Implementing F (T ) Gravity in Boltzmann Codes: A Framework for Power Spectrum Computation |
| topic | General Relativity and Quantum Cosmology Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2512.16404 |