4 papers
Homothetic Killing horizons in generic Vaidya spacetimes
Ritwika Ghoshal, Nilay Kundu, Srijit Bhattacharjee
We study the conformal Killing equation for generic Vaidya-like spacetimes, including those with rotation. We show that these spacetimes admit a unique class of conformal Killing v…
Perturbative soft graviton theorems in de Sitter spacetime
Divyesh N. Solanki, Pratik Chattopadhyay, Srijit Bhattacharjee
We consider soft graviton scattering for a theory where Einstein's gravity is minimally coupled to a scalar field in the presence of a cosmological constant, i.e. in a background d…
Supertranslations at Spatial and Timelike Infinities in the First-Order Formalism
Divyesh N. Solanki, Srijit Bhattacharjee
We study supertranslations at spatial and future timelike infinity in the first-order formalism. We relax the Ashtekar-Engle-Sloan boundary conditions to allow supertranslations at…
Can the Near-Horizon Black Hole Memory be detected through Binary Inspirals?
Sajad A. Bhat, Srijit Bhattacharjee, Shasvath J. Kapadia
The memory effect, in the context of gravitational-waves (GWs), manifests itself in the permanent relative displacement of test masses when they encounter the GWs. A number of work…