75 citations · 378 across the 23 of their papers we have counts for
25 papers
From Density to Mass: A New Parametrized Framework for Dark Matter Environment Around Black Holes
Rajes Ghosh, Nicholas Speeney, Avijit Chowdhury +3
Astrophysical black holes (BHs) are not isolated vacuum objects but are expected to reside within complex environments, such as dark matter (DM) halos and baryonic distributions. S…
Accurate Black Hole Quasinormal Modes, Regge Poles, and Greybody Factors from Light Ring Ladder Symmetry
Rajes Ghosh, David Pereñiguez, Jaime Redondo-Yuste +1
The characteristic oscillations of a black hole can be understood in terms of null rays trapped near its unstable light ring, with this correspondence becoming exact in the high-fr…
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…
Universal Ladder Structure Across Scales: From Quantum to Black Hole Physics
Rajes Ghosh, Rajendra Prasad Bhatt, Sumanta Chakraborty +1
Second-order ordinary linear differential equations appear ubiquitously across physics, describing the behavior of systems from the quantum world of atoms to the classical world of…
Strong-field Gravitational Wave Lensing in the Kerr Background
M. V. S. Saketh, Rajes Ghosh, Anuj Mishra
Gravitational-wave (GW) lensing can encode valuable information about the properties of the intervening lens, but most existing studies remain restricted to the small-deflection, w…
Generalized Perturbed Kepler Problem: Gravitational Wave Imprints from Eccentric Compact Binaries
Rajes Ghosh, R. Prasad, Kabir Chakravarti +1
Observations of astrophysical binaries may reveal departures from pure Keplerian orbits due to environmental influences, modifications to the underlying gravitational dynamics, or…
Can Rotating Black Holes Have Short Hairs?
Rajes Ghosh, Chiranjeeb Singha
Despite the no-hair theorem, several notable hairy black hole (BH) solutions exist in both General Relativity and modified gravity theories. For such hairs to be detectable, they m…
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…
Birkhoff's Theorem and Uniqueness: A Peek Beyond General Relativity
Rajes Ghosh, Akash K Mishra, Avijit Chowdhury
In General Relativity, Birkhoff's theorem asserts that any spherically symmetric vacuum solution must be static and asymptotically flat. In this paper, we study the validity of Bir…
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…
Parameterized Non-circular Deviation from the Kerr Paradigm and Its Observational Signatures: Extreme Mass Ratio Inspirals and Lense-Thirring Effect
Rajes Ghosh, Kabir Chakravarti
Recent gravitational wave observations and shadow imaging have demonstrated the astonishing consistency of the Kerr paradigm despite all the special symmetries assumed in deriving…
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…
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…
Hairy Black Holes: Non-existence of Short Hairs and Bound on Light Ring Size
Rajes Ghosh, Selim Sk, Sudipta Sarkar
Several hairy black hole solutions are known to violate the original version of the celebrated no-hair conjecture. This prompted the development of a new theorem that establishes a…
Does the speed of gravitational waves depend on the source velocity?
Rajes Ghosh, Sreejith Nair, Lalit Pathak +2
The second postulate of special relativity states that the speed of light in vacuum is independent of the emitter's motion. The test of this postulate so far remains unexplored for…
Quasi-normal modes of non-separable perturbation equations: the scalar non-Kerr case
Rajes Ghosh, Nicola Franchini, Sebastian H. Völkel +1
Scalar, vector and tensor perturbations on the Kerr spacetime are governed by equations that can be solved by separation of variables, but the same is not true in generic stationar…
Regularized Stable Kerr Black Hole: Cosmic Censorships, Shadow and Quasi-Normal Modes
Rajes Ghosh, Mostafizur Rahman, Akash K Mishra
Black hole solutions in general relativity come with pathologies such as singularity and mass inflation instability, which are believed to be cured by a yet-to-be-found quantum the…
Constraining the topological Gauss-Bonnet coupling from GW150914
Kabir Chakravarti, Rajes Ghosh, Sudipta Sarkar
Recent gravitational wave observation based on the data from GW150914 has confirmed Hawking's area theorem and estimated the increase in total horizon area during a merger process…
Signature of Non-uniform Area Quantization on Black Hole Echoes
Kabir Chakravarti, Rajes Ghosh, Sudipta Sarkar
A classical black hole is characterized by a horizon that absorbs radiation of all frequencies incident on it. Perturbation of these black holes is well-understood via exponentiall…
Signature of Non-uniform Area Quantization on Gravitational Waves
Kabir Chakravarti, Rajes Ghosh, Sudipta Sarkar
Quantum aspects of black holes may have observational imprints on their absorption and emission spectrum. In this work, we consider the possibility of non-uniform area quantization…
Causality constraints in Quadratic Gravity
Jose D. Edelstein, Rajes Ghosh, Alok Laddha +1
Classifying consistent effective field theories for the gravitational interaction has recently been the subject of intense research. Demanding the absence of causality violation in…
Light rings of stationary spacetimes
Rajes Ghosh, Sudipta Sarkar
We present a novel theorem regarding light rings in a stationary spacetime with an ergoregion. We prove that any stationary, axisymmetric, and asymptotically flat spacetime in 1 +…
Overcharging Extremal Black Holes
Rajes Ghosh, Akash K Mishra, Sudipta Sarkar
The Weak Cosmic Censorship (WCC) conjecture can be used as a consistency criterion for any viable modification over general relativity (GR). We employ this idea to show that in con…
Black Hole Zeroth Law in Higher Curvature Gravity
Rajes Ghosh, Sudipta Sarkar
The zeroth law of black hole mechanics is an assertion of constancy of the surface gravity on a stationary Killing horizon. The Hawking temperature of the black hole horizon is pro…