Research PapersNo Access

AN ENTIRELY ANALYTICAL COSMOLOGICAL MODEL

SANDRO SILVA E COSTA

Centro de Ciências Naturais e Humanas, Universidade Federal do ABC, 09210-170, Santo André, São Paulo, Brazil

https://doi.org/10.1142/S021773230902845XCited by:9 (Source: Crossref)

Abstract

The purpose of the present study is to show that in a particular cosmological model, with an affine equation of state, one can obtain, besides the background given by the scale factor, Hubble and deceleration parameters, a representation in terms of scalar fields and, more important, explicit mathematical expressions for the density contrast and the power spectrum. Although the model so obtained is not realistic, it reproduces features observed in some previous numerical studies, and as such it indicates that the Chaplygin gas by itself is not competitive when compared to the usual Λ-CDM model.

Keywords:

PACS: 98.80.-k, 98.80.Jk, 95.35.+d, 95.36.+x

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