5 papers
Production of Gravitational Waves from Preheating and Tachyonic Instabilities
Khursid Alam, Koushik Dutta, Ahamadullah Khan
We analyze GW production during preheating for an -attractor potential terminating in the positive-curvature regime, with energy transfer via . Linear Floquet analysis a…
Scalaron dark matter dynamics: effects of Higgs non-minimal coupling to gravity
Shibendu Gupta Choudhury, Koushik Dutta, Deep Ghosh
One of the key features of the -gravity is the embedding of a scalar field, scalaron, into the gravity sector. The scalaron interacts with the Standard Model (SM) matter field…
DESI results: Hint towards coupled dark matter and dark energy
Amlan Chakraborty, Prolay K. Chanda, Subinoy Das +1
We investigate a scenario where a dark energy quintessence field with positive kinetic energy is coupled with dark matter. With two different self-interaction potentials for th…
Improved Treatment of Bosonic Dark Matter Dynamics in Neutron Stars: Consequences and Constraints
Koushik Dutta, Deep Ghosh, Biswarup Mukhopadhyaya
It is conceivable that a bosonic dark matter (DM) with non-gravitational interactions with SM particles will be accumulated at the center of a neutron star (NS) and can lead to bla…
CMB Constraints on Natural Inflation with Gauge Field Production
Khursid Alam, Koushik Dutta, Nur Jaman
The natural inflation model with a periodic cosine potential is ruled out by recent Planck 2018 data for the decay constant . If the Planck data is combi…