125 citations · 1.2k across the 50 of their papers we have counts for
50 papers
Non-thermal moduli production during preheating in -attractor inflation models
Khursid Alam, Mar Bastero-Gil, Koushik Dutta +1
Production of gravitationally coupled light moduli fields must be suppressed in the early universe, so that its decay products do not alter Big Bang Nucleosynthesis (BBN) predictio…
Gravitational Baryogenesis: Problems and Possible Resolution
E. Arbuzova, A. Dolgov, K. Dutta +1
The coupling of baryonic current to the derivative of the curvature scalar, , inherent to gravitational baryogenesis (GBG), leads to a fourth order differential equation of moti…
MeV to multi-TeV thermal WIMPs: most conservative limits
Koushik Dutta, Avirup Ghosh, Arpan Kar +1
We consider a weakly interacting massive particle (WIMP) dark matter (DM) annihilating into all possible Standard Model (SM) particle pairs, including the SM neutrinos, via -wav…
Effects of Reheating on Moduli Stabilization
Khursid Alam, Koushik Dutta
Moduli potential loses its minima due to external energy sources of inflaton energy density or radiation produced at the end of inflation. But, the non-existence of minima does not…
Screening Mechanism and Late-time Cosmology: Role of a Chameleon-Brans-Dicke Scalar Field
Soumya Chakrabarti, Koushik Dutta, Jackson Levi Said
We discuss a way in which the geometric scalar field in a Brans-Dicke theory can evade local astronomical tests and act as a driver of the late-time cosmic acceleration. This requi…
A general study of decaying scalar dark matter: existing limits and projected radio signals at the SKA
Koushik Dutta, Avirup Ghosh, Arpan Kar +1
We consider a decaying scalar dark matter (DM) with mass in the range 10 GeV - 10 TeV and vary the branching ratios of all possible two-body SM final states (excluding and in…