4 papers
Unique contributions to the scalar bispectrum in `just enough inflation'
H. V. Ragavendra, Debika Chowdhury, L. Sriramkumar
A scalar field rolling down a potential with a large initial velocity results in inflation of a finite duration. Such a scenario suppresses the scalar power on large scales improvi…
Inflation after Planck: Judgment Day
Debika Chowdhury, Jerome Martin, Christophe Ringeval +1
Inflation is considered as the best theory of the early universe by a very large fraction of cosmologists. However, the validity of a scientific model is not decided by counting th…
Enhancing the cross-correlations between magnetic fields and scalar perturbations through parity violation
Debika Chowdhury, L. Sriramkumar, Marc Kamionkowski
One often resorts to a non-minimal coupling of the electromagnetic field in order to generate magnetic fields during inflation. The coupling is expected to depend on a scalar field…
Cross-correlations between scalar perturbations and magnetic fields in bouncing universes
Debika Chowdhury, L. Sriramkumar, Marc Kamionkowski
Bouncing scenarios offer an alternative to the inflationary paradigm for the generation of perturbations in the early universe. Recently, there has been a surge in interest in exam…