https://doi.org/10.1140/epjc/s10052-016-4121-x
Regular Article - Theoretical Physics
Dynamics of warm Chaplygin gas inflationary models with quartic potential
1
Department of Mathematics, COMSATS Institute of Information Technology, Lahore, Pakistan
2
Department of Mathematics, Lahore Leads University, Lahore, Pakistan
3
Department of Mathematics, Kinnaird College for Women, Lahore, Pakistan
* e-mail: abduljawad@ciitlahore.edu.pk
** e-mail: jawadab181@yahoo.com
Received:
4
April
2016
Accepted:
28
April
2016
Published online:
18
May
2016
Warm inflationary universe models in the context of the generalized Chaplygin gas, the modified Chaplygin gas, and the generalized cosmic Chaplygin gas are being studied. The dissipative coefficient of the form 
, and the weak and the strong dissipative regimes are being considered. We use the quartic potential, 
, which is ruled out by current data in cold inflation but in our models by analysis it is seen to be in agreement with the WMAP9 and the latest Planck data. In these scenarios, the power spectrum, the spectral index, and the tensor-to-scalar ratio are being examined in the slow-roll approximation. We show the dependence of the tensor–scalar ratio r on the spectral index 
and observe that the range of the tensor–scalar ratio is 
in the generalized Chaplygin gas, 
in the modified Chaplygin gas, and 
in the generalized cosmic Chaplygin gas models. Our results are in agreement with recent observational data like WMAP9 and the latest Planck data.
© The Author(s), 2016
