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Physical Review D

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Intermediate inflation driven by DBI scalar field

N. Nazavari, A. Mohammadi^*, Z. Ossoulian, and Kh. Saaidi

Department of Physics, Faculty of Science, University of Kurdistan, Pasdaran Street, P.O. Box 66177-15175, Sanandaj, Iran

^*abolhassanm@gmail.com

Phys. Rev. D 93, 123504 – Published 2 June, 2016

DOI: https://doi.org/10.1103/PhysRevD.93.123504

Abstract

Picking out a DBI scalar field as inflation, the slow-rolling inflationary scenario is studied by attributing an exponential time function to scale factor, known as intermediate inflation. The perturbation parameters of the model are estimated numerically for two different cases, and the final result is compared with Planck data. The diagram of tensor-to-scalar ratio $r$ versus scalar spectra index $n_{s}$ is illustrated, and it is found that they are within an acceptable range as suggested by Planck. In addition, the acquired values for amplitude of scalar perturbation reveal the ability of the model to depict a good picture of the Universe in one of its earliest stages. As a further argument, the non-Gaussianity is investigated, displaying that the model prediction stands in a 68% C.L. regime according to the latest Planck data.

Physics Subject Headings (PhySH)

Inflation

Article Text

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