Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2009-10-12
Phys.Rev.Lett.104:091301,2010
Physics
High Energy Physics
High Energy Physics - Theory
5 pages. v2: Minor corrections. v3: Expanded discussion of attractor property, included numerical work confirming scale invari
Scientific paper
10.1103/PhysRevLett.104.091301
The universe can be made flat and smooth by undergoing a phase of ultra-slow (ekpyrotic) contraction, a condition achievable with a single, canonical scalar field and conventional general relativity. It has been argued, though, that generating scale-invariant density perturbations, requires at least two scalar fields and a two-step process that first produces entropy fluctuations and then converts them to curvature perturbations. In this paper, we identify a loophole in the argument and introduce an ekpyrotic model based on a single, canonical scalar field that generates nearly scale-invariant curvature fluctuations through a purely "adiabatic mechanism" in which the background evolution is a dynamical attractor. The resulting spectrum can be slightly red with distinctive non-gaussian fluctuations.
Khoury Justin
Steinhardt Paul J.
No associations
LandOfFree
Adiabatic Ekpyrosis: Scale-Invariant Curvature Perturbations from a Single Scalar Field in a Contracting Universe does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Adiabatic Ekpyrosis: Scale-Invariant Curvature Perturbations from a Single Scalar Field in a Contracting Universe, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Adiabatic Ekpyrosis: Scale-Invariant Curvature Perturbations from a Single Scalar Field in a Contracting Universe will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-639722