Speaker
Mr
Md. Wali Hossain
(Centre for Theoretical Physics, Jamia Millia Islamia, New Delhi-110025)
Description
A unified description of inflation and late-time cosmic acceleration (quintessential inflation) will be discussed 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.
Relic gravitational wave spectrum has 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.
Authors
Dr
Emmanuel N. Saridakis
(Physics Division, National Technical University of Athens, 15780 Zografou Campus, Athens, Greece)
Prof.
M. Sami
(Centre for Theoretical Physics, Jamia Millia Islamia, New Delhi-110025, India)
Mr
Md. Wali Hossain
(Centre for Theoretical Physics, Jamia Millia Islamia, New Delhi-110025)
Prof.
R. Myrzakulov
(Eurasian International Center for Theoretical Physics, Eurasian National University, Astana 010008, Kazakhstan)
