96 citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- North-West UniversityZA18 papers
- Hemwati Nandan Bahuguna Garhwal UniversityIN11 papers
- Manipal Academy of Higher EducationIN4 papers
- Inter-University Centre for Astronomy and AstrophysicsIN3 papers
- Universidad Michoacana de San Nicolás de HidalgoMX3 papers
- University of KwaZulu-NatalZA3 papers
- Central Asian UniversityUZ2 papers
- National University of UzbekistanUZ2 papers
- Pontificia Universidad Católica de ValparaísoCL2 papers
- University of BremenDE2 papers
- University of DelhiIN2 papers
- Aryabhatta Research Institute of Observational SciencesIN1 paper
38 papers
Quasinormal modes of a dyonic black hole in Einstein-Euler-Heisenberg theory
Shubham Kala, Abhishek Negi, Hemwati Nandan
In this study, we investigate the quasinormal modes of a non-rotating dyonic black hole within the framework of Einstein-Euler-Heisenberg theory. We present a detailed analysis foc…
Heavy Hexaquarks in the Flux Tube Model
Sindhu D G, Akhilesh Ranjan, Hemwati Nandan +1
Hexaquarks are one of the currently emerging topics in both experimental and theoretical high energy physics. Hexaquarks have been examined in relation to particle physics, however…
Regge Trajectories of Tetraquarks and Pentaquarks with Massive Quarks in the Flux Tube Model
Sindhu D G, Akhilesh Ranjan, Hemwati Nandan
In recent years, many tetraquarks and pentaquarks have been discovered by various experimental groups and X(3872), Zc(3900), X(4430), P + c (4312), P + c (4457) are some of the int…
Shadow and weak gravitational lensing of a rotating regular black hole in a non-minimally coupled Einstein-Yang-Mills theory in the presence of plasma
Shubham Kala, Hemwati Nandan, Prateek Sharma
The null geodesics of the regular and rotating magnetically charged black hole in a non-minimally coupled Einstein-Yang-Mills theory surrounded by a plasma medium is studied. The e…
Stability of circular geodesics in equatorial plane of Kerr spacetime
Pradeep Singh, Hemwati Nandan, Lokesh Kumar Joshi +2
We analyze the stability of circular geodesics for timelike as well as null geodesics of the Kerr BH spacetime with rotation parameter on the equatorial plane by Lyapunov stability…
Stability analysis of circular orbits around a traversable wormhole with massless conformally coupled scalar field
Shobhit Giri, Hemwati Nandan, Lokesh Kumar Joshi +1
We study the stability of circular orbits in the background of a traversable wormhole (TWH) spacetime obtained as a solution of Einstein's field equations coupled conformally to a…
Geodesic stability and quasinormal modes of non-commutative Schwarzschild black hole employing Lyapunov exponent
Shobhit Giri, Hemwati Nandan, Lokesh Kumar Joshi +1
We study the dynamics of test particle and stability of circular geodesics in the gravitational field of a non-commutative geometry inspired Schwarzschild black hole spacetime (NCS…
Efficiency of Penrose process in spacetime of axially symmetric magnetized Reissner-Nordström black hole
Sanjar Shaymatov, Pankaj Sheoran, Ricardo Becerril +2
In this paper, we investigate the Penrose process in the purlieus of the axially symmetric magnetized Reissner-Nordström black hole for both neutral and charged particles. We start…
Geodesics and Bending of Light around a BTZ Black Hole Surrounded by Quintessential Matter
Shubham Kala, Hemwati Nandan, Prateek Sharma +1
Various observations from cosmic microwave background radiation (CMBR), type Ia supernova and baryon acoustic oscillations (BAO) are strongly suggestive of an accelerated expansion…
Stability analysis of circular orbits around a charged BTZ black hole spacetime in a nonlinear electrodynamics model via Lyapunov exponents
Shobhit Giri, Hemwati Nandan, Lokesh Kumar Joshi +1
We investigate the existence and stability of both the timelike and null circular orbits for a (2+1) dimensional charged BTZ black hole in Einstein-nonlinear Maxwell gravity with a…
Stability Analysis of Geodesics and Quasinormal Modes of a Dual Stringy Black Hole Via Lyapunov Exponents
Shobhit Giri, Hemwati Nandan
We investigate the stability of both timelike as well as null circular geodesics in the vicinity of a dual (3+1) dimensional stringy black hole (BH) spacetime by using an excellent…
Optical and Thermodynamic Properties of a Rotating Dyonic Black Hole Spacetime in gauged supergravity
Prateek Sharma, Hemwati Nandan, Uma Papnoi +1
The null geodesics and the distance of closest approach for photon around a rotating dyonic black hole in gauged supergravity is studied. The phenomenon o…
Shadow and deflection angle of charged rotating black hole surrounded by perfect fluid dark matter
Farruh Atamurotov, Uma Papnoi, Kimet Jusufi
We analysed the shadow cast by charged rotating black hole (BH) in presence of perfect fluid dark matter (PFDM). We studied the null geodesic equations and obtained the shadow of t…
Spectro-Timing Analysis of a highly variable narrow-line Seyfert 1 galaxy NGC 4748 with AstroSat and XMM-Newton
Main Pal, Neeraj Kumari, Pankaj Kushwaha +8
We present a detailed timing and spectral study of an extremely variable narrow-line Seyfert~1 galaxy NGC 4748 using observations in the year 2017 and 2014 performed with AstroSat…
Deflection of Light Around a Rotating BTZ Black Hole
Shubham Kala, Hemwati Nandan, Prateek Sharma
We present a detailed study of gravitational lensing around a rotating BTZ black hole in (2+1) dimensional gravity. The study of orbits for massless test particle around this BH sp…
Deflection of Light and Shadow Cast by a Dual Charged Stringy Black Hole
Shubham Kala, Saurabh, Hemwati Nandan +1
Gravitational lensing and black hole shadows are one of the strongest observational evidences to prove the existence of black holes in the universe. The gravitational lensing arise…
Particle collisions near static spherically symmetric black holes
Eva Hackmann, Hemwati Nandan, Pankaj Sheoran
It has been shown by Bañados, Silk and West (BSW) that the center of mass energy (E_cm) of test particles starting from rest at infinity and colliding near the horizon of a Schwarz…
Schwarzschild black hole surrounded by quintessential matter field as an accelerator for spinning particles
Pankaj Sheoran, Hemwati Nandan, Eva Hackmann +2
We study the collision of two massive particles with non-zero intrinsic spin moving in the equatorial plane in the background of a Schwarzschild black hole surrounded by quintessen…
Shear-free conditions of a Chaplygin-Gas-dominated universe
Amare Abebe, Mudhahir Al Ajmi, Maye Elmardi +2
In this work, we revisit the shear-free conjecture of general relativity and show the violation of the well-known shear-free condition for perfect-fluid spacetimes. It had been sho…
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…
Energy extraction and particle acceleration around a rotating dyonic black hole in , gauged supergravity
Anik Rudra, Hemwati Nandan, Radouane Gannouji +2
In the present paper, we explore various gravitational aspects such as energy extraction (via the Penrose process and Superradiance), particle collisions around a ,…
Analytic solutions of the geodesic equation for Reissner-Nordström-(anti-)de Sitter black holes surrounded by different kinds of regular and exotic matter fields
Arindam Kumar Chatterjee, Kai Flathmann, Hemwati Nandan +1
The purpose of this study is the derivation of the equation of motion for particles and light in the spacetime of Reissner-Nordström-(anti-)de Sitter black holes in the background…
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-…
Regge Trajectories of Exotic Hadrons in the Flux Tube Model
Hemwati Nandan, Akhilesh Ranjan
We have investigated the Regge trajectories of exotic hadrons by considering different possible pentaquark configurations with finite quark mass in the flux tube model. Signifi- ca…