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IR flow of stochastic power spectra for interacting spectator scalars in the inflationary de Sitter spacetime
Vishal Nath, Sourav Bhattacharya
In this work we investigate the behaviour of early inflationary cosmic correlation functions under the flow of the infrared scale for interacting spectator scalar field theories. W…
Effect of non-minimal coupling on gravitational light bending
Ayan Kumar Naskar, Avijit Sen Majumder, Sourav Bhattacharya
We investigate the bending of massless fields by a massive object in the presence of a curvature-scalar non-minimal coupling up to one loop, using the perturbativ…
non-minimal coupling, and the long range gravitational potential for different spin fields from 2-2 scattering amplitudes
Avijit Sen Majumder, Ayan Kumar Naskar, Sourav Bhattacharya
In this paper, we investigate the long range gravitational effect of curvature-scalar field non-minimal coupling in the form of , in the perturbative quantum gravity framew…
Yukawa scalar self energy at two loop and in the inflationary de Sitter spacetime
Sourav Bhattacharya, Moutushi Dutta Choudhury
We have considered the Yukawa theory at two loop in the inflationary de Sitter spacetime, for a massless minimally coupled scalar and a massless fermion. The one loop computation f…
Scattering of massive spin-2 field via graviton exchanges with different spin fields and the long range gravitational potential
Avijit Sen Majumder, Sourav Bhattacharya
In this work, we compute the graviton mediated scattering amplitude of a massive spin-2 Fierz-Pauli field with various other massive spin fields, and in the non-relativistic limit,…
coupling, cosmological constant and quantum gravitational correction to Newton's potential
Avijit Sen Majumder, Sourav Bhattacharya
This letter investigates the contribution of the interaction to the long range gravitational potential for massive scalar fields, from the non-relativistic limit o…
Effective action for -Yukawa theory via 2PI formalism in the inflationary de Sitter spacetime
Sourav Bhattacharya, Kinsuk Roy
We consider a scalar field theory with quartic self interaction, Yukawa coupled to fermions in the inflationary de Sitter spacetime background. The scalar has a classical backgroun…
Loop correction and resummation of vertex functions for a self interacting scalar field in the de Sitter spacetime
Sourav Bhattacharya, Sudesh Kumar
We consider a massless and minimally coupled self interacting quantum scalar field theory in the inflationary de Sitter background of dimension four. The self interaction potential…
Non-perturbative analysis for a massless minimal quantum scalar with in the inflationary de Sitter spacetime
Sourav Bhattacharya, Nitin Joshi
We consider a massless, minimally coupled quantum scalar field theory with an asymmetric self interaction, () in the inflationary de Sitter spacetime…