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2013

Multi-field G-inflation

Kobayashi, Tsutomu, Tanahashi, Norihiro, Yamaguchi, Masahide

Understand

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.