COM1 - Inflation |
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Speaker |
Mizuno, Shuntaro |
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Co-autors |
Frederico Arroja, Kazuya Koyama, Takahiro Tanaka |
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Talk Title |
Lorentz boost and non-Gaussianity in multi-field DBI-inflation |
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Abstract |
We show that higher-order actions for cosmological perturbations in the multi-field DBI-inflation model are obtained by a Lorentz boost from the rest frame of the brane to the frame where the brane is moving. We confirm that this simple method provides the same third- and fourth- order actions at leading order in slow-roll and in the small sound speed limit as those obtained by the usual ADM formalism. As an application, we compute the leading order connected four-point function of the primordial curvature perturbation coming from the intrinsic fourth-order contact interaction in the multi-field DBI-inflation model. |
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