Evolution of metric perturbations in a model of nonsingular inflationary cosmology
Yi-Fu Cai; Xinmin Zhang; Yi-Fu Cai; Institute of High Energy Physics, Chinese Academy of Sciences, P.O.Box 918-4, Beijing 100049, P. R. China; Xinmin Zhang; Institute of High Energy Physics, Chinese Academy of Sciences, P.O.Box 918-4, Beijing 100049, P. R. China
Журнал:
Journal of Cosmology and Astroparticle Physics
Дата:
2009-06-01
Аннотация:
In this paper we study the primordial perturbations generated in an inflation model in which the period of inflation is preceded by a cosmological bounce. After reviewing the background evolution in this model we study the resulting curvature perturbations, entropy fluctuations and non-Gaussianities. Our results show that both the power spectrum of curvature perturbations and the spectra describing the non-Gaussianities obtain oscillatory features. Next, we calculate the tensor perturbations in this model and find a valley in its spectrum. This is a generic feature of inflationary models with a bounce. Further observational signatures and theoretical implications of the model are discussed.
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