33 citations · 36 across the 4 of their papers we have counts for
8 papers
From Non-Thermal to Thermal: Cosmological Imprints of Self-Interacting Secluded Dark Matter
Koushik Dutta, Deep Ghosh, Ahamadullah Khan
Dark matter (DM), secluded from the Standard Model (SM), can attain internal thermalization through self-interactions. We investigate the thermalization of a real scalar DM field w…
Hydrostatic Equilibrium Constraints on the Fuzzy Dark Matter Mass from Dwarf Spheroidals: Method, Systematics, and Robustness
Samrat Mitra, Koushik Dutta
We present the analysis of a non-parametric estimator of the fuzzy (wave) dark matter (FDM) boson mass based on local hydrostatic equilibrium: the classical gravitational accelerat…
Distinguishing Coupled Dark Matter Dark Energy from Kinematic Phantom Crossing
Samit Ganguly, Koushik Dutta, Goutam Manna
Recent measurements of cosmic expansion have renewed interest in dark-energy scenarios in which the effective equation of state exhibits phantom-like evolution and may cross …
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…