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In this work, we study an inflationary scenario in the presence ofGeneralized Chaplygin Gas (GCG). We show that in Einstein gravity, GCG is not asuitable candidate for inflation; but in a five dimensional brane worldscenario, it can work as a viable inflationary model. We calculate the relevantquantities such as $n_{s}$, $r$ and $A_{s}$ related to the primordial scalarand 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 primordialpower spectrum, GCG as an inflationary model can not resolve the tensionbetween results from BICEP2 and Planck with a concordance $\Lambda$CDMUniverse. We show that going beyond the concordance $\Lambda$CDM model andincorporating more general dark energy behaviour, this tension may be eased. Wealso obtain the constraints on the $n_{s}$ and $r$ and the GCG model parametersusing Planck+WP+BICEP2 data considering the CPL dark energy behaviour.

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