Cosmological perturbations in a noncommutative braneworld inflation

Abstract

We use the smeared, coherent state picture of noncommutativity to study evolution of perturbations in a noncommutative braneworld scenario. Within the standard procedure of studying braneworld cosmological perturbations, we study the evolution of the Bardeen metric potential and curvature perturbations in this model. We show that in this setup, the early stage of the universe's evolution has a transient phantom evolution with imaginary effective sound speed. © 2012 National Astronomical Observatories of Chinese Academy of Sciences and IOP Publishing Ltd..