Observational Viability of Anisotropic Inflation Revisited
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| Format: | Preprint |
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2025
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| author | Roushan, Maryam Rashidi, Narges Nozari, Kourosh |
| author_facet | Roushan, Maryam Rashidi, Narges Nozari, Kourosh |
| contents | We investigate anisotropic inflation within the single-field model featuring an intermediate scale factor. Our analysis reveals that the anisotropic nature of the Friedmann equations in this framework affects the slow-roll parameters, which in turn influence key perturbation parameters. Using a numerical approach, we derive constraints on the intermediate parameter $β$ and the anisotropic parameter $c$. Our results show that the model is consistent with Planck2018 TT, TE, EE +lowE+lensing+BK14+BAO data at $68\%$ CL, for $0.84<β<1$ and $7.34<c<27.7$. At $95\%$ CL the consistency holds for $0.77<β<1$ and $7.17<c<28.9$. The model is also consistent with Planck2018 TT, TE, EE +lowE+lensing+BK18+BAO data, for $0.91<β<1$ and $8.00<c<27.4$ (at $68\%$ CL), and $0.88<β<1$ and $7.40<c<28.8$ (at $95\%$ CL). Additionally, we examine the reheating phase using these constraints on constraints on $β$ and $c$ and determine the observationally consistent ranges for the number of e-folds and the temperature during the reheating phase. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2503_08277 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Observational Viability of Anisotropic Inflation Revisited Roushan, Maryam Rashidi, Narges Nozari, Kourosh Cosmology and Nongalactic Astrophysics General Relativity and Quantum Cosmology High Energy Physics - Theory We investigate anisotropic inflation within the single-field model featuring an intermediate scale factor. Our analysis reveals that the anisotropic nature of the Friedmann equations in this framework affects the slow-roll parameters, which in turn influence key perturbation parameters. Using a numerical approach, we derive constraints on the intermediate parameter $β$ and the anisotropic parameter $c$. Our results show that the model is consistent with Planck2018 TT, TE, EE +lowE+lensing+BK14+BAO data at $68\%$ CL, for $0.84<β<1$ and $7.34<c<27.7$. At $95\%$ CL the consistency holds for $0.77<β<1$ and $7.17<c<28.9$. The model is also consistent with Planck2018 TT, TE, EE +lowE+lensing+BK18+BAO data, for $0.91<β<1$ and $8.00<c<27.4$ (at $68\%$ CL), and $0.88<β<1$ and $7.40<c<28.8$ (at $95\%$ CL). Additionally, we examine the reheating phase using these constraints on constraints on $β$ and $c$ and determine the observationally consistent ranges for the number of e-folds and the temperature during the reheating phase. |
| title | Observational Viability of Anisotropic Inflation Revisited |
| topic | Cosmology and Nongalactic Astrophysics General Relativity and Quantum Cosmology High Energy Physics - Theory |
| url | https://arxiv.org/abs/2503.08277 |