12 citations · 24 across the 11 of their papers we have counts for
11 papers
Precision Analysis for Using Upcoming Multi-band Gravitational Wave Observations
Setabuddin, Md Riajul Haque, Ratna Koley +1
We investigate how multi-band gravitational wave (GW) observations can constrain the uncertainties in the Hubble parameter () using primordial black holes (PBHs) as possible s…
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…
Effective General Relativistic Description of Jamming in Granular Matter
Soumendra Kishore Roy, Pratyusava Baral, Ratna Koley +1
We propose here that certain observational features of granular matter in the infrared limit, exhibiting the phenomenon of {\it jamming}, arise from an underlying effective general…
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…
Inflationary field excursion in broad classes of scalar field models
Argha Banerjee, Ratna Koley
In single field slow roll inflation models the height and slope of the potential are to satisfy certain conditions, to match with observations. This in turn translates into bounds…