Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2009-04-15
JCAP 0906:001,2009
Physics
High Energy Physics
High Energy Physics - Theory
11 pages; a schematic picture of exit from and re-entry to sound horizon was added (v2); version accepted for publication in J
Scientific paper
10.1088/1475-7516/2009/06/001
Based on the renormalizable theory of gravitation recently proposed by Horava, we present a simple scenario to generate almost scale-invariant, super-horizon curvature perturbations. The anisotropic scaling with dynamical critical exponent z=3 implies that the amplitude of quantum fluctuations of a free scalar field generated in the early epoch of the expanding universe is insensitive to the Hubble expansion rate and, thus, scale-invariant. Those fluctuations are later converted to curvature perturbations by the curvaton mechanism or/and the modulated decay of heavy particles/oscillating fields. This scenario works, for example, for power law expansion a\propto t^p with p>1/3 and, thus, does not require inflation. Also, this scenario does not rely on any additional assumptions such as the detailed balance condition.
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