Khronon inflation

Paolo Creminelli, Jorge Noreña, Manuel Peña, Marko Simonović

Producción científica: Contribución a una revistaArtículorevisión exhaustiva

16 Citas (Scopus)


We study the possibility that the approximate time shift symmetry during inflation is promoted to the full invariance under time reparametrization t (t), or equivalently under field redefinition of the inflaton φ→ φ(φ). The symmetry allows only two operators at leading order in derivatives, so that all n-point functions of scalar perturbations are fixed in terms of the power spectrum normalization and the speed of sound. During inflation the decaying mode only decays as 1/a and this opens up the possibility to violate some of the consistency relations in the squeezed limit, although this violation is suppressed by the (small) breaking of the field reparametrization symmetry. In particular one can get terms in the 3-point function that are only suppressed by 1/k L in the squeezed limit k L→0 compared to the local shape.

Idioma originalInglés
Número de artículo032
PublicaciónJournal of Cosmology and Astroparticle Physics
EstadoPublicada - nov. 2012
Publicado de forma externa


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