6 papers
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…
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…