Theory HEP Seminar

A unified description of inflation and dark energy

Wali Hossain

Centre for Theoretical Physics
Jamia Millia Islamia

I will discuss a unified description of inflation and late-time cosmic acceleration, in variable gravity frame work. Nonminimal coupling between massive neutrinos and the scalar field is considered in the Einstein frame. Tensor-to- scalar ratio is large (r > 0.1) such that the scale of inflation is around the GUT scale which are consistent with the recent BICEP2 results. Relic gravity waves have a blue spectrum due to the presence of kinetic energy dominated regime after inflation. Instant preheating is implemented since ordinary reheating mechanism does not work here. Lyth bound can be evaded in this model. After neutrinos become non-relativistic the nonminimal coupling becomes effective and plays an important roll for the scalar field to exit from the scaling behavior and dominate over the matter giving rise to late time cosmic acceleration.