74 citations · 1.1k across the 62 of their papers we have counts for
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Linearised gravitational radiation in de Sitter spacetime at all multipole orders
Harsh, Omkar Shetye, Amitabh Virmani
We derive the linearised gravitational waves generated by a localised matter source in the Poincare patch of de Sitter spacetime at arbitrary multipole order. The linearised de Sit…
Octupolar Gravitational Radiation in de Sitter Spacetime
Harsh, Omkar Shetye, Amitabh Virmani
We derive the gravitational radiation generated by a localised matter source in de Sitter spacetime at octupolar order in the multipolar expansion, working in generalised harmonic…
On supertranslation invariant Lorentz charges
Sumanta Chakraborty, Sk Jahanur Hoque, Amitabh Virmani
In recent papers, Fuentealba, Henneaux, and Troessaert (FHT) gave definitions for supertranslation invariant Lorentz charges in the ADM Hamiltonian formalism and showed that their…
Tidal Forces in Kerr-AdS and Grey Galaxies
Anand Balivada, Pius Ranjan Padhi, Amitabh Virmani
In a recent paper [arXiv:2305.08922], it has been proposed that the endpoint of the Kerr-AdS superradiant instability is a Grey Galaxy. The conjectured solutions are supposed to be…
The Kerr-de Sitter spacetime in Bondi coordinates
Sk Jahanur Hoque, Amitabh Virmani
We use zero angular momentum null geodesics in the Kerr-de Sitter spacetime to transform the metric in a generalised Bondi coordinate system. We write the metric components explici…
On Late Time Tails in an Extreme Reissner-Nordström Black Hole: Frequency Domain Analysis
Srijit Bhattacharjee, Bidisha Chakrabarty, David D. K. Chow +2
In this brief note, we revisit the study of the leading order late time decay tails of massless scalar perturbations outside an extreme Reissner-Nordström black hole. Previous auth…
On Propagation of Energy Flux in de Sitter Spacetime
Sk Jahanur Hoque, Amitabh Virmani
In this paper, we explore propagation of energy flux in the future Poincaré patch of de Sitter spacetime. We present two results. First, we compute the flux integral of energy usin…
Charged Vaidya Solution Satisfies Weak Energy Condition
Soumyabrata Chatterjee, Suman Ganguli, Amitabh Virmani
The external matter stress-tensor supporting charged Vaidya solution appears to violate weak energy condition in certain region of the spacetime. Motivated by this, a new interpret…
On Asymptotic Flatness and Lorentz Charges
Geoffrey Compère, François Dehouck, Amitabh Virmani
In this paper we establish two results concerning four-dimensional asymptotically flat spacetimes at spatial infinity. First, we show that the six conserved Lorentz charges are enc…
The Physical Process First Law for Bifurcate Killing Horizons
Aaron J. Amsel, Donald Marolf, Amitabh Virmani
The physical process version of the first law for black holes states that the passage of energy and angular momentum through the horizon results in a change in area $\fracκ{8 π} ΔA…
Covariant Counterterms and Conserved Charges in Asymptotically Flat Spacetimes
Robert B. Mann, Donald Marolf, Amitabh Virmani
Recent work has shown that the addition of an appropriate covariant boundary term to the gravitational action yields a well-defined variational principle for asymptotically flat sp…