Anisotropic inflation with derivative couplings

Jonathan Holland, Sugumi Kanno, Ivonne Zavala

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)

Abstract

We study anisotropic power-law inflationary solutions when the inflaton and its derivative couple to a vector field. This type of coupling is motivated by D-brane inflationary models, in which the inflaton, and a vector field living on the D-brane, couple disformally (derivatively). We start by studying a phenomenological model where we show the existence of anisotropic solutions and demonstrate their stability via a dynamical system analysis. Compared to the case without a derivative coupling, the anisotropy is reduced and thus can be made consistent with current limits, while the value of the slow-roll parameter remains almost unchanged. We also discuss solutions for more general cases, including D-brane-like couplings.

Original languageEnglish
Article number103534
JournalPhysical Review D
Volume97
Issue number10
DOIs
Publication statusPublished - May 15 2018
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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