2013
DOI: 10.1103/physrevd.88.103512
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Cosmological perturbations in inflationary models with anisotropic space-time scaling in a Lifshitz background

Abstract: Models of inflation in a gravitational background with an anisotropic space-time scaling are studied. The background is a higher-dimensional Lifshitz throat with the anisotropy scaling z = 1. After the dimensional reduction, the four-dimensional general covariance is explicitly broken to a threedimensional spatial diffeomorphism. As a result the cosmological perturbation theory in this set up with less symmetries have to be formulated. We present the consistent cosmological perturbation theory for this set up.… Show more

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“…Here the change in C R allows b t = 1 and c t = 1 in addition to b s = 1 and c s = 1 due to C N R (see [37,38] for a similar model motivated by asymmetric scalings in time and space in a higher dimensional theory). These more complicated cases are members of scalar-tensor theories from the GLPV class [13]…”
Section: E Non-canonical Examplesmentioning
confidence: 99%
“…Here the change in C R allows b t = 1 and c t = 1 in addition to b s = 1 and c s = 1 due to C N R (see [37,38] for a similar model motivated by asymmetric scalings in time and space in a higher dimensional theory). These more complicated cases are members of scalar-tensor theories from the GLPV class [13]…”
Section: E Non-canonical Examplesmentioning
confidence: 99%