Gravitational waves in ultra-slow-roll and their anisotropy at two loops

Autor:	Ruiz, Juan Álvarez, Rey, Julián
Rok vydání:	2024
Předmět:	Astrophysics - Cosmology and Nongalactic Astrophysics General Relativity and Quantum Cosmology High Energy Physics - Phenomenology
Druh dokumentu:	Working Paper
Popis:	We compute the non-Gaussian corrections to the energy density and anisotropies of gravitational waves induced after an ultra-slow-roll phase of inflation by using a diagrammatic approach, and present the corresponding Feynman rules. Our two-loop calculation includes both the intrinsic non-Gaussianity of the inflaton perturbation $\delta\phi$ and the non-Gaussianity arising from the nonlinear relation between the latter and the curvature perturbation $\mathcal{R}$. We apply our formalism to an analytical model in which the ultra-slow-roll phase is followed by a constant-roll stage with a nonvanishing second slow-roll parameter $\eta$, and address the renormalization of the one-loop scalar power spectrum in this scenario. Comment: 30 pages, 3 figures
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/2410.09014 Zobrazit plný text záznamu View this record from Arxiv