Eur. Phys. J. Plus (2014) 129: 224
https://doi.org/10.1140/epjp/i2014-14224-x

Regular Article

Graceful exit from inflation to radiation era with rapidly decreasing agegraphic potentials

¹ Dipartimento di Matematica, Università “Tor Vergata”, Via della Ricerca Scientifica 1, 00133, Roma, Italy
² SMC-ISC-CNR and Dipartimento di Fisica, Università “La Sapienza”, Ple. Aldo Moro 2, 00185, Roma, Italy

^* e-mail: viaggiu@axp.mat.uniroma2.it

Received: 14 March 2014
Revised: 18 August 2014
Accepted: 20 September 2014
Published online: 21 October 2014

Abstract

We present a class of models where both the primordial inflation and the late-time de Sitter phase are driven by simple phenomenological agegraphic potentials. In this context, a possible new scenario for a smooth exit from inflation to the radiation era is discussed by resorting the kination (stiff) era but without the inefficient radiation production mechanism of these models. This is done by considering rapidly decreasing expressions for V(t) soon after inflation. We show that the parameters of our models can reproduce the scalar spectral parameter n_s predicted by Planck data in particular for models with concave potentials. Finally, according to the recent BICEP2 data, all our models allow a huge amount of primordial gravitational waves.