$\mathbb{T}^{2}$- inflation: Sourced by energy-momentum squared gravity
| Autor: | Mansoori, Seyed Ali Hosseini, Felegary, Fereshteh, Roshan, Mahmood, Akarsu, Ozgur, Sami, Mohammad |
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| Rok vydání: | 2023 |
| Předmět: | |
| Druh dokumentu: | Working Paper |
| Popis: | In this paper, we examine chaotic inflation within the context of the energy-momentum squared gravity (EMSG) focusing on the energy-momentum powered gravity (EMPG) that incorporates the functional $f(\mathbb{T}^2)\propto (\mathbb{T}^2)^{\beta}$ in the Einstein-Hilbert action, in which $\beta$ is a constant and $\mathbb{T}^2\equiv T_{\mu \nu}T^{\mu \nu}$ where $T_{\mu \nu}$ is the energy-momentum tensor, which we consider to represent a single scalar field with a power-law potential. We demonstrate that the presence of EMSG terms allows the single-field monomial chaotic inflationary models to fall within current observational constraints, which are otherwise disfavored by Planck and BICEP/Keck findings. We show that the use of a non-canonical Lagrangian with chaotic potential in EMSG can lead to significantly larger values of the non-Gaussianity parameter, $f_{\rm Nl}^{\rm equi}$ whereas EMSG framework with canonical Lagrangian gives rise to results similar to those of the standard single-field model. Comment: 25 pages, 4 figures, and 2 tables, added discussion, accepted by Physics of the Dark Universe |
| Databáze: | arXiv |
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