186 citations · 2.1k across the 68 of their papers we have counts for
69 papers
Chiral gravitational waves from multi-phase magnetogenesis
H. V. Ragavendra, Gianmassimo Tasinato, L. Sriramkumar
Cosmological vector fields are central to many early-Universe phenomena, including inflationary dynamics, primordial magnetogenesis, and dark-matter scenarios. However, constructin…
Cross-correlation between the curvature perturbations and magnetic fields in pure ultra slow roll inflation
Sagarika Tripathy, Debika Chowdhury, H. V. Ragavendra +1
Motivated by the aim of producing significant number of primordial black holes, over the past few years, there has been a considerable interest in examining models of inflation inv…
Loop contributions to the scalar power spectrum due to quartic order action in ultra slow roll inflation
Suvashis Maity, H. V. Ragavendra, Shiv K. Sethi +1
[Abridged] In contemporary literature, the calculation of modifications to the inflationary scalar power spectrum due to the loops from the higher order interaction terms in the Ha…
The Borde-Guth-Vilenkin Theorem in extended de Sitter spaces
William H. Kinney, Suvashis Maity, L. Sriramkumar
The Borde-Guth-Vilenkin (BGV) theorem states that any spacetime with net positive expansion must be geodesically incomplete. We derive a new version of the theorem using the fluid…
Amplifying quantum discord during inflationary magnetogenesis through violation of parity
Sagarika Tripathy, Rathul Nath Raveendran, Krishnamohan Parattu +1
It is well known that, during inflation, the conformal invariance of the electromagnetic action has to be broken in order to produce magnetic fields of observed strengths today. Of…
Observational imprints of enhanced scalar power on small scales in ultra slow roll inflation and associated non-Gaussianities
H. V. Ragavendra, L. Sriramkumar
The discovery of gravitational waves from merging binary black holes has generated considerable interest in examining whether these black holes could have a primordial origin. If a…