Inflationary cosmology with Chaplygin gas in Palatini formalism

Abstract

We present a simple generalisation of the $\Lambda$CDM 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.

19 pages, 6 figures, typos corrected; version accepted by JCAP

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• Cosmological bouncing solutions in f(T,B) gravity
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• Starobinsky cosmological model in Palatini formalism
• On stability of a neutron star system in Palatini gravity
• Stability criterion for white dwarfs in Palatini $f(R)$ gravity
• Polytropic stars in Palatini gravity
• Cosmological consequences and statefinder diagnosis of a non-interacting generalized Chaplygin gas in $f(R,T)$ gravity
• Cooling process of brown dwarfs in Palatini f(R) gravity
• New class of hybrid metric-Palatini scalar-tensor theories of gravity
• Metric-affine effects in crystallization processes of white dwarfs
• Do sewn singularities falsify the Palatini cosmology?
• Anisotropic deformations in a class of projectively-invariant metric-affine theories of gravity
• Cosmological constraints of Palatini $f(\mathcal{R})$ gravity
• The Palatini star: exact solutions of the modified Lane-Emden equation
• Non-homogeneous exoplanets in metric-affine gravity
• Galaxy Rotation Curves via Conformal Factors
• Constraining Palatini gravity with GR-independent equations of state for neutron stars
• Cooling Process of White Dwarf Stars in Palatini $f(R)$ Gravity
• A non-trivial connection for the metric-affine Gauss-Bonnet theory in $D=4$
• Isocurvature modes and non-Gaussianity in affine inflation
• Scalar-tensor gravity in the Palatini approach
• Extended Theories of Gravity in cosmological and astrophysical applications