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- W2574308188 abstract "It has been pointed out that non-singular cosmological solutions in second-order scalar-tensor theories generically suffer from gradient instabilities. We extend this no-go result to second-order gravitational theories with an arbitrary number of interacting scalar fields. Our proof follows directly from the action of generalized multi-Galileons, and thus is different from and complementary to that based on the effective field theory approach. Several new terms for generalized multi-Galileons on a flat background were proposed recently. We find a covariant completion of them and confirm that they do not participate in the no-go argument." @default.
- W2574308188 created "2017-01-26" @default.
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- W2574308188 date "2017-03-08" @default.
- W2574308188 modified "2023-10-10" @default.
- W2574308188 title "Generalized multi-Galileons, covariantized new terms, and the no-go theorem for nonsingular cosmologies" @default.
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- W2574308188 doi "https://doi.org/10.1103/physrevd.95.064011" @default.
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