Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2010-12-03
Phys.Rev.D84:023511,2011
Physics
High Energy Physics
High Energy Physics - Theory
7 pages, 1 figure. v2: Included section reviewing non-gaussianity calculation, added references
Scientific paper
10.1103/PhysRevD.84.023511
We derive all single-field cosmologies with unit sound speed that generate scale invariant curvature perturbations on a dynamical attractor background. We identify three distinct phases: slow-roll inflation; a slowly contracting adiabatic ekpyrotic phase, described by a rapidly-varying equation of state; and a novel adiabatic ekpyrotic phase on a slowly expanding background. All of these yield identical power spectra. The degeneracy is broken at the 3-point level: unlike the nearly gaussian spectrum of slow-roll inflation, adiabatic ekpyrosis predicts large non-gaussianities on small scales.
Khoury Justin
Miller Godfrey E. J.
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