19 citations · 104 across the 16 of their papers we have counts for
17 papers
AdS S-Matrix for Massive Vector Fields
Nabamita Banerjee, Amogh Neelkanth Desai, Karan Fernandes +2
We generalize a recent ``AdS S-matrix" formulation for interacting massive scalars on AdS spacetimes to the case of massive vector fields. This method relies on taking the infinite…
Soft factors with AdS radius corrections
Karan Fernandes, Nabamita Banerjee, Arpita Mitra
We review recent developments concerning the soft factorization of scattering amplitudes that arise in the large radius limit of four dimensional Anti-de Sitter (AdS) spacetime…
Celestial Eikonal Amplitudes in the Near-Horizon Region
Karan Fernandes, Feng-Li Lin, Arpita Mitra
We investigate the celestial description of an eikonal amplitude for the scattering of massless scalars mediated by soft gravitons in the near-horizon region of a large eternal Sch…
corrected soft photon theorem from a CFT Ward identity
Nabamita Banerjee, Karan Fernandes, Arpita Mitra
Classical soft theorems applied to probe scattering processes on AdS spacetimes predict the existence of corrections to the soft photon and soft graviton factors of asy…
Dynamical analogue spacetimes in non-relativistic flows
Karan Fernandes, Susovan Maity, Tapas K. Das
Analogue gravity models describe linear fluctuations of fluids as a massless scalar field propagating on stationary acoustic spacetimes constructed from the background flow. In thi…
Soft Photon theorem in the small negative cosmological constant limit
Nabamita Banerjee, Karan Fernandes, Arpita Mitra
We study the effect of electromagnetic interactions on the classical soft theorems on an asymptotically AdS background in 4 spacetime dimensions, in the limit of a small cosmologic…
Horizon Hair from Inversion Symmetry
Karan Fernandes, Debodirna Ghosh, Amitabh Virmani
The extreme Reissner-Nordström solution has a discrete conformal isometry that maps the future event horizon to future null infinity and vice versa, the Couch-Torrence inversion is…
Emergent gravity through non-linear perturbation
Karan Fernandes, Susovan Maity, Tapas K. Das
As of now, all analogue gravity models available in the literature deal with the emergence of an acoustic geometry through linear perturbations of transonic fluids only. It has nev…
Soft factors from classical scattering on the Reissner-Nordström spacetime
Karan Fernandes, Arpita Mitra
We consider perturbations of the dimensional Reissner-Nordström spacetime induced by the probe scattering of a point particle with charge and mass moving on an unbound trajecto…
Schwarzschild de Sitter and extremal surfaces
Karan Fernandes, Kedar S. Kolekar, K. Narayan +1
We study extremal surfaces in the Schwarzschild de Sitter spacetime with real mass parameter. We find codim-2 timelike extremal surfaces stretching between the future and past boun…
Hamiltonian BRST formalism for gauge fields on black hole spacetimes
Karan Fernandes, Amitabha Lahiri
We investigate the Becchi-Rouet-Stora-Tyutin (BRST) formalism for gauge theories on spherically symmetric black hole spacetimes, with or without a cosmological constant ().…
Constrained field theories on Kerr backgrounds
Karan Fernandes, Amitabha Lahiri
We analyze the constraints of gauge theories on Kerr and Kerr-de Sitter spacetimes, which contain one or more horizons. We find that the constraints are modified on such background…
Electrovacuum solutions in non-local gravity
Karan Fernandes, Arpita Mitra
We consider the coupling of the electromagnetic field to a non-local gravity theory comprising of the Einstein-Hilbert action in addition to a non-local term as…
Gravitational anomalies on the Newton-Cartan background
Karan Fernandes, Arpita Mitra
We derive the trace and diffeomorphism anomalies of the Schrödinger field minimally coupled to the Newton-Cartan background using Fujikawa's path integral approach. This approach i…
Constrained field theories on spherically symmetric spacetimes with horizons
Karan Fernandes, Suman Ghosh, Amitabha Lahiri
We apply the Dirac-Bergmann algorithm for the analysis of constraints to gauge theories defined on spherically symmetric black hole backgrounds. We find that the constraints for a…
The inverse spatial Laplacian of spherically symmetric spacetimes
Karan Fernandes, Amitabha Lahiri
In this paper we derive the inverse spatial Laplacian for static, spherically symmetric backgrounds by solving Poisson's equation for a point source. This is different from the ele…
Kaluza Ansatz applied to Eddington inspired Born-Infeld Gravity
Karan Fernandes, Amitabha Lahiri
We apply Kaluza's procedure to Eddington-inspired Born-Infeld action in gravity in five dimensions. The resulting action contains, in addition to the usual four-dimensional actions…