Eur. Phys. J. C (2017) 77: 700
https://doi.org/10.1140/epjc/s10052-017-5264-0

Regular Article - Theoretical Physics

Impact of generalized dissipative coefficient on warm inflationary dynamics in the light of latest Planck data

¹ Department of Mathematics, COMSATS Institute of Information Technology, Lahore, 54000, Pakistan
² Department of Mathematics, Aspire College, Hafizabad, Pakistan
³ Instituto de Física, Pontificia Universidad Católica de Valparaíso, Avda. Universidad 330, Curauma, Valparaíso, Chile

^* e-mail: abduljawad@ciitlahore.edu.pk
^** e-mail: jawadab181@yahoo.com

Received: 26 April 2017
Accepted: 24 September 2017
Published online: 24 October 2017

Abstract

The warm inflation scenario in view of the modified Chaplygin gas is studied. We consider the inflationary expansion to be driven by a standard scalar field whose decay ratio has a generic power-law dependence with the scalar field and the temperature of the thermal bath T. By assuming an exponential power-law dependence in the cosmic time for the scale factor a(t), corresponding to the intermediate inflation model, we solve the background and perturbative dynamics considering our model to evolve according to (1) weak dissipative regime and (2) strong dissipative regime. Specifically, we find explicit expressions for the dissipative coefficient, scalar potential, and the relevant inflationary observables like the scalar power spectrum, scalar spectral index, and tensor-to-scalar ratio. The free parameters characterizing our model are constrained by considering the essential condition for warm inflation, the conditions for the model evolves according to weak or strong dissipative regime, and the 2015 Planck results through the –r plane.