Multifield extension of G inflation

Tsutomu Kobayashi, Norihiro Tanahashi, Masahide Yamaguchi

Research output: Contribution to journalArticlepeer-review

34 Citations (Scopus)

Abstract

We propose a multifield 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 multifield Dirac-Born-Infield Galileon inflation is not included in the multifield 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.

Original languageEnglish
Article number083504
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Volume88
Issue number8
DOIs
Publication statusPublished - Oct 8 2013

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Physics and Astronomy (miscellaneous)

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