66 citations · 183 across the 12 of their papers we have counts for
12 papers · 1 filter
Light rings and optical appearances of naked singularities, solitons, and black holes in beyond Horndeski gravity
Hyat Huang, Jutta Kunz, Rashmi Uniyal +1
We investigate the geodesic structure and optical appearance of compact objects with primary scalar hair in shift- and parity-symmetric beyond Horndeski gravity. The analytic solut…
Deflection of Light by a Rotating Black Hole Surrounded by "Quintessence"
Prateek Sharma, Hemwati Nandan, Radouane Gannouji +2
We present a detailed analysis of a rotating black hole surrounded by "quintessence". This solution represents a fluid with a constant equation of state, , which can for example…
Bending angle of light in equatorial plane of Kerr-Sen Black Hole
Rashmi Uniyal, Hemwati Nandan, Philippe Jetzer
We study the gravitational lensing by a Kerr-Sen Black Hole arising in heterotic string theory. A closed form expression for the bending angle of light in equatorial plane of Kerr-…
Strong lensing and Observables around 5D Myers-Perry black hole spacetime
Ravi Shankar Kuniyal, Hemwati Nandan, Uma Papnoi +2
We study the motion of massless test particles in a five dimensional (5D) Myers-Perry black hole spacetime with two spin parameters. The behaviour of the effective potential in vie…
Null Geodesics and Red-Blue Shifts of Photons Emitted from Geodesic Particles Around a Non-Commutative Black Hole Spacetime
Ravi Shankar Kuniyal, Rashmi Uniyal, Anindya Biswas +2
We investigate the geodesic motion of massless test particles in the background of a noncommutative geometry inspired Schwarzschild black hole. The behaviour of effective potential…
Null Geodesics and Observables around Kerr-Sen Black Hole
Rashmi Uniyal, Hemwati Nandan K. D. Purohit
We investigate the geodesic motion in the background of Kerr-Sen Black Hole arising in the heterotic string theory. The nature of effective potential is discussed in radial as well…
Geodesic Flows in a Charged Black Hole Spacetime with Quintessence
Hemwati Nandan, Rashmi Uniyal
We investigate the evolution of timelike geodesic congruences, in the background of a charged black hole spacetime surrounded with quintessence. The Raychaudhuri equations for thre…
Null Geodesics in a Magnetically Charged Stringy Black Hole Spacetime
Ravi Shankar Kuniyal, Rashmi Uniyal, Hemwati Nandan +1
We study the geodesic motion of massless test particles in the background of a magnetic charged black hole spacetime in four dimensions in dilaton-Maxwell gravity. The behaviour of…
Geodesic motion in R- charged black hole space-times
Rashmi Uniyal, Anindya Biswas, Hemwati Nandan +1
We study the geodesic motion of massive and massless test particles in the background of a particular class of multiple charge black holes in gauged supergravity theories in D = 4.…
Geodesic flows around charged black holes in two dimensions
Ravi Shankar Kuniyal, Rashmi Uniyal, Hemwati Nandan +1
We study the evolution of timelike geodesics for two dimensional black hole spacetimes arising in string theory and general theory of relativity by solving the Raychaudhuri equatio…
Geodesic Motion in a Charged 2D Stringy Blackhole Spacetime
Rashmi Uniyal, Hemwati Nandan, K. D. Purohit
We study the timelike geodesics and geodesic deviation for a two-dimensional stringy blackhole spacetime in Schwarzschild gauge. We have analyzed the properties of effective potent…
Geodesic Motion in Schwarzschild Spacetime Surrounded by Quintessence
Rashmi Uniyal, N. Chandrachani Devi, Hemwati Nandan +1
We study the time-like geodesic congruences, in the space-time geometry of a Schwarzschild black hole surrounded by quintessence. The nature of effective potential along with the s…