Inflationary cosmology with Chaplygin gas in Palatini formalism

We present a simple generalisation of the ΛCDM model which on the one hand reaches very good agreement with the present day experimental data and provides an internal inflationary mechanism on the other hand. It is based on Palatini modified gravity with quadratic Starobinsky term and generalized Ch...

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Bibliographic Details
Published in:Journal of cosmology and astroparticle physics 2016-01, Vol.2016 (1), p.40-40
Main Authors: Borowiec, Andrzej, Stachowski, Aleksander, Szydłowski, Marek, Wojnar, Aneta
Format: Article
Language:English
Subjects:
ASTROPHYSICS, COSMOLOGY AND ASTRONOMY
COSMOLOGY
COUPLING
CURRENTS
GRAVITATION
LAGRANGIAN FUNCTION
NONLUMINOUS MATTER
PERTURBATION THEORY
SINGULARITY
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Summary:We present a simple generalisation of the ΛCDM model which on the one hand reaches very good agreement with the present day experimental data and provides an internal inflationary mechanism on the other hand. It is based on Palatini modified gravity with quadratic Starobinsky term and generalized Chaplygin gas as a matter source providing, besides a current accelerated expansion, the epoch of endogenous inflation driven by type III freeze singularity. It follows from our statistical analysis that astronomical data favors negative value of the parameter coupling quadratic term into Einstein-Hilbert Lagrangian and as a consequence the bounce instead of initial Big-Bang singularity is preferred.
ISSN:1475-7516
1475-7516
DOI:10.1088/1475-7516/2016/01/040