12 citations · 24 across the 11 of their papers we have counts for
8 papers · 1 filter
Scalar and Spinor Quasi Normal Modes of a 2D Dilatonic Blackhole
Pabitra Gayen, Ratna Koley
External non-minimally coupled scalar and spinor field perturbations have been studied in a (1 + 1) dimensional dilatonic blackhole spacetime [1, 2]. Exact analytical expressions o…
Decoding Horizonless Spacetime: Plasma-Induced Features in a Rotating Wormhole Shadow
Pabitra Gayen, Ratna Koley
We investigate the shadow properties in a recently proposed geometry of a rotating wormhole under realistic astrophysical conditions, particularly in the presence of a cold and non…
Characterizing a class of accelerating wormholes with periodic potential
Soham Chatterjee, Sagnik Roy, Ratna Koley
The newly discovered Wormhole C--metric is a solution of Einstein's field equation coupled with a phantom scalar field which describes the accelerated wormholes. In the zero accele…
Shadow of higher dimensional collapsing dark star and blackhole
Sagnik Roy, Soham Chatterjee, Ratna Koley
The shadow of a black hole or a collapsing star is of great importance as we can extract important properties of the object and of the surrounding spacetime from the shadow profile…
Probing the post-Minkowskian approximation using recursive addition of self-interactions
Soumendra Kishore Roy, Ratna Koley, Parthasarathi Majumdar
We address the problem of deriving the post-Minkowskian approximation, widely used in current gravitational wave literature by investigating a possible deduction out of the recursi…
Kinematics of Two-particle Scattering in Black Hole Backgrounds
Soumendra Kishore Roy, Ratna Koley, Parthasarathi Majumdar
We show that particle scattering in general curved backgrounds entails {\it six} independent, kinematical Mandelstam-like invariants, instead of the two in flat spacetime. Spacetim…
Gravitational Waves with Orbital Angular Momentum
Pratyusava Baral, Anarya Ray, Ratna Koley +1
Compact orbiting binaries like the black hole binary system observed in GW150914 carry large amount of orbital angular momentum. The post-ringdown compact object formed after merge…
Bacteria Around an Acoustic Black Hole: Trapping and Frame-Dragging
Amitava Banerjee, Ratna Koley, Parthasarathi Majumdar
Motivated by the need to conceive freely-precessing gyroscopes for detecting acoustic frame-dragging predicted recently in rotating acoustic analogue black holes, we report an inci…