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General mechanism for producing scale-invariant perturbations and small non-Gaussianity in ekpyrotic models
Physical Review D
We explore a new type of entropic mechanism for generating density perturbations in a contracting phase in which there are two scalar fields, but only one has a steep negative potential. This first field dominates the energy density and is the source of the ekpyrotic equation of state. The second field has a negligible potential, but its kinetic energy density is coupled to the first field with a non-linear sigma-model type interaction. We show that for any ekpyrotic equation of state it isdoi:10.1103/physrevd.89.123520 fatcat:vfdboar675ed3kaqkxce3ws3a4