Towards a Cosmological Dual to Inflation

Autor:	Khoury, Justin, Miller, Godfrey E. J.
Rok vydání:	2010
Předmět:	High Energy Physics - Theory Astrophysics - Cosmology and Extragalactic Astrophysics
Zdroj:	Phys.Rev.D84:023511,2011
Druh dokumentu:	Working Paper
DOI:	10.1103/PhysRevD.84.023511
Popis:	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. Comment: 7 pages, 1 figure. v2: Included section reviewing non-gaussianity calculation, added references
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/1012.0846 Zobrazit plný text záznamu View this record from Arxiv