Big Bang Nucleosynthesis constraints on $f(T,L_m)$ gravity
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arXiv
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| Hauptverfasser: | , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866909805025689600 |
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| author | Cruz, Daniel F. P. Pereira, David S. Lobo, Francisco S. N. Mimoso, José P. |
| author_facet | Cruz, Daniel F. P. Pereira, David S. Lobo, Francisco S. N. Mimoso, José P. |
| contents | In this work, we investigate Big Bang Nucleosynthesis (BBN) within the framework of $f(T,{L}_m)$ gravity, where the gravitational Lagrangian is generalized as a function of the torsion scalar $T$ and the matter Lagrangian ${L}_m$. We analyze three representative $f(T,{L}_m)$ models and derive constraints on their free parameters, $α$ and $β$, by combining observational bounds from the freeze-out temperature with the primordial abundances of deuterium, helium-4, and lithium-7. For each model, the parameter space consistent with all elemental $Z$-constraints and the freeze-out condition is determined. These results demonstrate that $f(T,{L}_m)$ modifications can accommodate the tight observational constraints of BBN, suggesting that minimal extensions to the matter sector provide viable alternatives to the standard cosmological description and offer a promising framework for exploring modified gravity in the early Universe. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2509_20309 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Big Bang Nucleosynthesis constraints on $f(T,L_m)$ gravity Cruz, Daniel F. P. Pereira, David S. Lobo, Francisco S. N. Mimoso, José P. Cosmology and Nongalactic Astrophysics General Relativity and Quantum Cosmology High Energy Physics - Theory In this work, we investigate Big Bang Nucleosynthesis (BBN) within the framework of $f(T,{L}_m)$ gravity, where the gravitational Lagrangian is generalized as a function of the torsion scalar $T$ and the matter Lagrangian ${L}_m$. We analyze three representative $f(T,{L}_m)$ models and derive constraints on their free parameters, $α$ and $β$, by combining observational bounds from the freeze-out temperature with the primordial abundances of deuterium, helium-4, and lithium-7. For each model, the parameter space consistent with all elemental $Z$-constraints and the freeze-out condition is determined. These results demonstrate that $f(T,{L}_m)$ modifications can accommodate the tight observational constraints of BBN, suggesting that minimal extensions to the matter sector provide viable alternatives to the standard cosmological description and offer a promising framework for exploring modified gravity in the early Universe. |
| title | Big Bang Nucleosynthesis constraints on $f(T,L_m)$ gravity |
| topic | Cosmology and Nongalactic Astrophysics General Relativity and Quantum Cosmology High Energy Physics - Theory |
| url | https://arxiv.org/abs/2509.20309 |