Inflationary generalized Chaplygin gas and dark energy in the light of the Planck and BICEP2 experiments

Abstract

In this work, we study an inflationary scenario in the presence of Generalized Chaplygin Gas (GCG). We show that in Einstein gravity, GCG is not a suitable candidate for inflation; but in a five dimensional brane world scenario, it can work as a viable inflationary model. We calculate the relevant quantities such as $n_s$, $r$ and $A_s$ related to the primordial scalar and tensor fluctuations, and using their recent bounds from Planck and BICEP2, we constrain the model parameters as well as the five-dimensional Planck mass. But as a slow-roll inflationary model with a power-law type scalar primordial power spectrum, GCG as an inflationary model can not resolve the tension between results from BICEP2 and Planck with a concordance $\Lambda$CDM Universe. We show that going beyond the concordance $\Lambda$CDM model and incorporating more general dark energy behaviour, this tension may be eased. We also obtain the constraints on the $n_s$ and $r$ and the GCG model parameters using Planck+WP+BICEP2 data considering the CPL dark energy behaviour.

12 pages, Latex style, 7 eps figures, 1 table

References in corpus (5)

• Whipped inflation
• Chaplygin inspired Inflation
• Can primordial magnetic fields be the origin of the BICEP2 data?
• Chaplygin inflation on the brane
• Does the BICEP2 Observation of Cosmological Tensor Modes Imply an Era of Nearly Planckian Energy Densities?

Cited by in corpus (4)

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• Phase Space Analysis and Thermodynamics of Interacting Umami Chaplygin gas in FRW Universe
• Dynamical systems analysis of a cosmological model with interacting Umami Chaplygin fluid in adiabatic particle creation mechanism: Some bouncing features
• No slow-roll inflation à la Generalized Chaplygin Gas in General Relativity