Cosmological perturbations in a noncommutative braneworld inflation  

作　　者：Kourosh Nozari Siamak Akhshabi 

机构地区：[1]Department of Physics,Faculty of Basic Sciences,University of Mazandaran,P.O.Box 47416-95447,Babolsar,Iran

出　　处：《Research in Astronomy and Astrophysics》2012年第6期625-635,共11页天文和天体物理学研究（英文版）

摘　　要：We use the smeared, coherent state picture of noncommutativity to study evolution of perturbations in a noncommutative braneworld scenario. Within the stan- dard procedure of studying braneworld cosmological perturbations, we study the evo- lution 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 phan- tom evolution with imaginary effective sound speed.We use the smeared, coherent state picture of noncommutativity to study evolution of perturbations in a noncommutative braneworld scenario. Within the stan- dard procedure of studying braneworld cosmological perturbations, we study the evo- lution 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 phan- tom evolution with imaginary effective sound speed.

关 键 词：early universe cosmology -- cosmology theory 

分 类 号：P159[天文地球—天文学]