Anisotropic power-law inflation for a model of two scalar and two vector fields

Tuan Q. Do*, W. F. Kao

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Inspired by an interesting counterexample to the cosmic no-hair conjecture found in a supergravity-motivated model recently, we propose a multi-field extension, in which two scalar fields are allowed to non-minimally couple to two vector fields, respectively. This model is shown to admit an exact Bianchi type I power-law solution. Furthermore, stability analysis based on the dynamical system method is performed to show that this anisotropic solution is indeed stable and attractive if both scalar fields are canonical. Nevertheless, if one of the two scalar fields is phantom then the corresponding anisotropic power-law inflation turns unstable as expected.

Original languageEnglish
Article number525
JournalEuropean Physical Journal C
Volume81
Issue number6
DOIs
StatePublished - Jun 2021

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