23 citations · 275 across the 31 of their papers we have counts for
32 papers
Dark Matter Freeze-in from a Reheaton
Avirup Ghosh, Alexei H. Sopov, Raymond R. Volkas
We consider the Standard Model (SM) extended by a secluded gauge sector encompassing a Dirac fermion () dark matter (DM), an abelian gauge boson and a SM-sin…
Laws of black hole mechanics in the Einstein-Gauss-Bonnet theory
Ayan Chatterjee, Sahil Devdutt, Avirup Ghosh
We extend the isolated horizon formalism to include rotating black holes arising in five dimensional Einstein-Gauss-Bonnet (EGB) theory of gravity, and derive the laws of black hol…
Cannibal dark matter decoupled from standard model: cosmological constraints
Avirup Ghosh, Sourav Gope, Satyanarayan Mukhopadhyay
An internally thermalized dark matter (DM) with only gravitational interaction with the standard model (SM) particles at low temperatures, may undergo number-changing self-scatteri…
Momentum distribution of dark matter produced in inflaton decay: effect of inflaton mediated scatterings
Avirup Ghosh, Satyanarayan Mukhopadhyay
Post-inflationary reheating is a widely discussed mechanism for non-thermal production of dark matter (DM). In this scenario the momentum distribution of the produced DM particles…
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…
Gravitational Collapse in the EGB Gravity
Ayan Chatterjee, Avirup Ghosh, Suresh Jaryal
The Einstein- Gauss- Bonnet (EGB) gravity is an important modification of the Einstein theory of gravity and, for many gravitational phenomena, the Gauss- Bonnet (GB) correction te…
Inducing supertranslations: The membrane picture
Avirup Ghosh
Dynamical evolution of black holes may be studied perturbatively in the membrane picture. We study the case of a body freely falling into a black hole, in the Rindler approximation…
Decaying fermionic warm dark matter and XENON1T electronic recoil excess
Koushik Dutta, Avirup Ghosh, Arpan Kar +1
In the light of the recently observed XENON1T electronic recoil (ER) data, we investigate the possibility of constraining the parameter space of a generic fermionic warm dark matte…
Cosmology of complex scalar dark matter: interplay of self-scattering and annihilation
Avirup Ghosh, Deep Ghosh, Satyanarayan Mukhopadhyay
The cosmology of a standard model (SM) gauge singlet complex scalar dark matter (DM), stabilized by a reflection symmetry, is studied including all renormalizable interactions that…
Revisiting the role of CP-conserving processes in cosmological particle-antiparticle asymmetries
Avirup Ghosh, Deep Ghosh, Satyanarayan Mukhopadhyay
We point out qualitatively different possibilities on the role of CP-conserving processes in generating cosmological particle-antiparticle asymmetries, with illustrative examples f…
Dynamical horizons and Super-Translation transitions of the horizon
Ayan Chatterjee, Avirup Ghosh
A condition is defined which determines if a supertranslation is induced in the course of a general evolution from one isolated horizon phase to another via a dynamical horizon. Th…
Models of decaying FIMP Dark Matter: potential links with the Neutrino Sector
Laura Covi, Avirup Ghosh, Tanmoy Mondal +1
The absolute stability of a dark matter (DM) particle is not a binding requirement. Here we suggest a few scenarios where the DM particle is liable to decay via extremely feeble in…
Asymmetric dark matter from semi-annihilation
Avirup Ghosh, Deep Ghosh, Satyanarayan Mukhopadhyay
We show that a general semi-annihilation scenario, in which a pair of dark matter (DM) particles annihilate to an anti-DM, and an unstable state that can mix with or decay to stand…
On Super-Translation transition between Quasi-local Black holes
Amit Ghosh, Avirup Ghosh, Pritam Nanda
We re-explore the symmetries of a weakly isolated horizon (WIH) from the perspective of freedom in the choice of intrinsic data. The supertranslations are realized as additional sy…
Search for decaying heavy dark matter in an effective interaction framework: a comparison of -ray and radio observations
Avirup Ghosh, Arpan Kar, Biswarup Mukhopadhyaya
We investigate and compare the possibilities of observing decaying dark matter (DM) in -ray and radio telescopes. The special emphasise of the study is on a scalar heavy DM part…
Gamma-ray signals from multicomponent scalar dark matter decays
Avirup Ghosh, Alejandro Ibarra, Tanmoy Mondal +1
Within a multicomponent dark matter scenario, novel gamma-ray signals may arise from the decay of the heavier dark matter component into the lighter. For a scalar dark sector of th…
Inhomogeneous Jacobi equation and Holographic subregion complexity
Avirup Ghosh, Rohit Mishra
We derive a general expression for obtaining Holographic subregion complexity for asymptotically spacetimes, pertubatively around pure using a variational technique. An…
Constraints on higher curvature gravity from time delay between GW170817 and GRB 170817A
Avirup Ghosh, Soumya Jana, Akash K Mishra +1
General relativity may be an effective theory with higher curvature correction terms in the action. Inclusion of these terms leads to exciting new possibilities, e.g., gravitationa…
Right sneutrino with masses as non-thermal dark matter
Avirup Ghosh, Tanmoy Mondal, Biswarup Mukhopadhyaya
We consider MSSM with right-chiral neutrino superfields with Majorana masses, where the lightest right-handed sneutrino dominated scalars constitutes non-thermal dark matter (DM).…
Long-lived stau, sneutrino dark matter and right-slepton spectrum
Shankha Banerjee, Geneviève Bélanger, Avirup Ghosh +1
The minimal supersymmetric (SUSY) standard model (MSSM) augmented by right chiral sneutrinos may lead to one such sneutrino serving as the lightest supersymmetric particle and a no…
Boundary Conservation from Bulk Symmetry
C. Fairoos, Avirup Ghosh, Sudipta Sarkar
The evolution of the black hole horizon can be effectively captured by a fictitious membrane fluid living on the stretched horizon. We show that the dynamics of this boundary matte…
Black Hole Entropy production and Transport coefficients in Lovelock Gravity
C. Fairoos, Avirup Ghosh, Sudipta Sarkar
We study the entropy evolution of black holes in Lovelock gravity by formulating a thermodynamic generalization of null Raychaudhuri equation. We show that the similarity between t…
An Inhomogeneous Jacobi equation for minimal surfaces and perturbative change of Holographic Entanglement Entropy
Avirup Ghosh, Rohit Mishra
The change in Holographic entanglement entropy (HEE) for small fluctuations about pure anti De Sitter (AdS) is obtained by a perturbative expansion of the area functional in terms…
Massless charged particles: Cosmic censorship, and Third law of Black Hole Mechanics
C. Fairoos, Avirup Ghosh, Sudipta Sarkar
The formulation of the laws of black hole mechanics assumes the stability of black holes under perturbations in accordance with the "cosmic censorship hypothesis"(CCH). CCH prohibi…