Cosmic inflation in metric-affine gravity

Autor:	Gialamas, Ioannis D., Tamvakis, Kyriakos
Rok vydání:	2024
Předmět:	General Relativity and Quantum Cosmology Astrophysics - Cosmology and Nongalactic Astrophysics High Energy Physics - Theory
Druh dokumentu:	Working Paper
Popis:	In the context of metric-affine gravity theories, where the metric and connection are independent, we examine actions involving quadratic terms in the Ricci scalar curvature and the Holst invariant. These actions are non-minimally coupled to a scalar field. We explore the behavior of the corresponding effective metric theory, which includes an extra dynamic pseudoscalar degree of freedom. Detailed analysis of inflationary predictions reveals compliance with recent observations across various parameters, potentially allowing a higher tensor-to-scalar ratio. The spectral index's direction of change varies based on parameter positioning. Comment: 11 pages, 2 figures, Contribution to Proceedings of HEP 2023, Ioannina, Greece
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/2410.22263 Zobrazit plný text záznamu View this record from Arxiv