Multi-field G-inflation
High Energy Physics - Theory
2017-03-08 v2 Cosmology and Nongalactic Astrophysics
General Relativity and Quantum Cosmology
High Energy Physics - Phenomenology
Abstract
We propose a multi-field extension of (generalized) G-inflation, based on covariant multi-galileons and their generalization preserving second-order field equations. We compute the quadratic action for cosmological perturbations. By comparing the formulas for cosmological perturbations, it is highlighted that multi-field DBI galileon inflation is not included in the multi-field version of generalized G-inflation. Our result indicates that the generalized covariant multi-galileon theory is not the most general multi-scalar-tensor theory with second-order field equations.
Keywords
Cite
@article{arxiv.1308.4798,
title = {Multi-field G-inflation},
author = {Tsutomu Kobayashi and Norihiro Tanahashi and Masahide Yamaguchi},
journal= {arXiv preprint arXiv:1308.4798},
year = {2017}
}
Comments
12 pages; v2: version accepted for publication in PRD