186 citations · 2.1k across the 68 of their papers we have counts for
4 papers · 1 filter
Viable scalar spectral tilt and tensor-to-scalar ratio in near-matter bounces
Rathul Nath Raveendran, L. Sriramkumar
In a recent work, we had constructed a model consisting of two fields---a canonical scalar field and a non-canonical ghost field---that had sourced a symmetric matter bounce scenar…
Primordial features from ekpyrotic bounces
Rathul Nath Raveendran, L. Sriramkumar
Certain features in the primordial scalar power spectrum are known to improve the fit to the cosmological data. We examine whether bouncing scenarios can remain viable if future da…
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…