4 papers
Curing inflationary degeneracies using reheating predictions and relic gravitational waves
Swagat S. Mishra, Varun Sahni, Alexei A. Starobinsky
It is well known that the inflationary scenario often displays different sets of degeneracies in its predictions for CMB observables. These degeneracies usually arise either becaus…
Primordial Black Holes from a tiny bump/dip in the Inflaton potential
Swagat S. Mishra, Varun Sahni
Scalar perturbations during inflation can be substantially amplified by tiny features in the inflaton potential. A bump-like feature behaves like a local speed-breaker and lowers t…
Emulating CDM-like expansion on the Phantom brane
Satadru Bag, Swagat S. Mishra, Varun Sahni
In [Schmidt PRD 80 123003 (2009)], the author suggested that dynamical dark energy (DDE) propagating on the phantom brane could mimick CDM. Schmidt went on to derive a phenomeno…
Unifying Dark Matter and Dark Energy with non-Canonical Scalars
Swagat S. Mishra, Varun Sahni
Non-canonical scalar fields with the Lagrangian , possess the attractive property that the speed of sound, , can be exceedingly smal…