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

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.

preprint2015arXivOpen access
Seiju OhashiNorihiro TanahashiTsutomu KobayashiMasahide Yamaguchi
astro-ph.COgr-qchep-th
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Seiju OhashiNorihiro TanahashiTsutomu KobayashiMasahide Yamaguchi

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