The most general second-order field equations of bi-scalar-tensor theory in four dimensions

Seiju Ohashi, Norihiro Tanahashi, Tsutomu Kobayashi, Masahide Yamaguchi

Research output: Contribution to journalArticle

28 Citations (Scopus)

Abstract

Abstract: The Horndeski theory is known as the most general scalar-tensor theory with second-order field equations. In this paper, we explore the bi-scalar extension of the Horndeski theory. Following Horndeski’s approach, we determine all the possible terms appearing in the second-order field equations of the bi-scalar-tensor theory. We compare the field equations with those of the generalized multi-Galileons, and confirm that our theory contains new terms that are not included in the latter theory. We also discuss the construction of the Lagrangian leading to our most general field equations.

Original languageEnglish
Article number8
Pages (from-to)1-22
Number of pages22
JournalJournal of High Energy Physics
Volume2015
Issue number7
DOIs
Publication statusPublished - Jul 1 2015

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics

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