33 citations · 78 across the 10 of their papers we have counts for
10 papers
How Universal Is the Black Hole Zeroth Law?
Rajes Ghosh, Sudipta Sarkar
The black hole zeroth law asserts the thermal equilibrium of a stationary Killing horizon, yet its status beyond general relativity remains limited. We demonstrate that its validit…
Quasinormal Ringdown and Echoes in Accreting Exotic Compact Objects
Chanchal Sharma, Kabir Chakravarti, Sudipta Sarkar
Exotic compact objects (ECOs) may produce late-time gravitational-wave (GW) echoes, but sufficiently compact ECOs undergoing realistic accretion may eventually form an event horizo…
Ladder Symmetry: The Necessary and Sufficient Condition for Vanishing Love Numbers
Chanchal Sharma, Shuvayu Roy, Sudipta Sarkar
Black holes in four-dimensional, asymptotically flat general relativity have vanishing static tidal Love numbers (TLNs), a property tied to a hidden symmetry of the perturbation eq…
Overcharging Extremal Rotating Black Holes
Shauvik Biswas, Amruta Sadhu, Sudipta Sarkar
In this work, we use the weak cosmic censorship conjecture(WCC) to constrain black hole solutions in modified gravity theories. While Wald showed that extremal Kerr-Newman black ho…
Probing Spacetime Symmetries Using Gravitational Wave Ringdown
Rajes Ghosh, Akash K Mishra, Sudipta Sarkar
The uniqueness and rigidity theorems assert that the asymptotically flat, vacuum, stationary rotating black hole solution in general relativity must be the Kerr solution, exhibitin…
Restoring Causality in Higher Curvature Gravity
Jose D. Edelstein, Rajes Ghosh, Alok Laddha +1
Incorporating higher curvature terms into gravity theories modifies the classical field equations, potentially leading to theoretical issues like Shapiro time advancements that vio…
Bounds on the charge of the graviton using gravitational wave observations
Sreejith Nair, Aditya Vijaykumar, Sudipta Sarkar
If the graviton possesses a non-zero charge , gravitational waves (GW) originating from astrophysical sources would experience an additional time delay due to intergalactic ma…
Exploring Ladder Symmetry and Love Numbers for Static and Rotating Black Holes
Chanchal Sharma, Rajes Ghosh, Sudipta Sarkar
Black hole solutions of general relativity exhibit a symmetry for the static perturbations around these spacetimes, known as "ladder symmetry". This symmetry proves useful in const…
Asymptotically de-Sitter black holes have non-zero tidal Love numbers
Sreejith Nair, Sumanta Chakraborty, Sudipta Sarkar
Love numbers of compact objects quantify their tidal deformability against external perturbations. It is expected that Love numbers of asymptotically flat black holes (BHs) in Gene…
Formation and Stability of Area Quantized Black Holes
Kabir Chakravarti, Rajes Ghosh, Sudipta Sarkar
We investigate the ergoregion instability of area-quantized rotating quantum black holes (QBH) under gravitational perturbation. We show that the instability can be avoided in bina…