Inflation and reheating in quadratic metric-affine gravity with derivative couplings
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| Format: | Preprint |
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2024
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| _version_ | 1866917898921967616 |
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| author | Gialamas, Ioannis D. Katsoulas, Theodoros Tamvakis, Kyriakos |
| author_facet | Gialamas, Ioannis D. Katsoulas, Theodoros Tamvakis, Kyriakos |
| contents | Within the framework of metric-affine theories of gravity, where both the metric and connection are treated as independent variables, we consider actions quadratic in the Ricci scalar curvature coupled non-minimally to a scalar field through derivative couplings. Our analysis delves into the inflationary predictions, revealing their consistency with the latest observational constraints across a wide range of parameters. This compatibility permits adjustments such as an increase in the spectral index and a reduction in the tensor-to-scalar ratio. While we do not propose a specific reheating mechanism, our analysis demonstrates that within the quadratic model of inflation, the maximum reheating temperature can reach $\sim 3\times10^{15}\, {\rm GeV}$. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2403_08530 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Inflation and reheating in quadratic metric-affine gravity with derivative couplings Gialamas, Ioannis D. Katsoulas, Theodoros Tamvakis, Kyriakos General Relativity and Quantum Cosmology Cosmology and Nongalactic Astrophysics High Energy Physics - Phenomenology Within the framework of metric-affine theories of gravity, where both the metric and connection are treated as independent variables, we consider actions quadratic in the Ricci scalar curvature coupled non-minimally to a scalar field through derivative couplings. Our analysis delves into the inflationary predictions, revealing their consistency with the latest observational constraints across a wide range of parameters. This compatibility permits adjustments such as an increase in the spectral index and a reduction in the tensor-to-scalar ratio. While we do not propose a specific reheating mechanism, our analysis demonstrates that within the quadratic model of inflation, the maximum reheating temperature can reach $\sim 3\times10^{15}\, {\rm GeV}$. |
| title | Inflation and reheating in quadratic metric-affine gravity with derivative couplings |
| topic | General Relativity and Quantum Cosmology Cosmology and Nongalactic Astrophysics High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2403.08530 |