Department of Physics: Recent submissions

  • Pure Gauss–Bonnet NUT black hole solution: I 
    Mukherjee, Sajal (Springer, 2022-04)
    We obtain an exact -vacuum solution in the pure Gauss–Bonnet gravity with NUT charge in six dimension, with horizon having the product topology of . We discuss its horizon and singularity structure, and consequently arrive ...
  • Transition from inspiral to plunge for braneworld EMRI 
    Mukherjee, Sajal (IOP, 2023)
    In the present article, we discuss the late inspiral and then the transition regime to the plunge phase of a secondary, less massive compact object into a more massive braneworld black hole, in the context of an ...
  • Pure Gauss–Bonnet NUT black hole with and without non-central singularity 
    Mukherjee, Sajal (Springer, 2021-05)
    It is known that NUT solution has many interesting features and pathologies like being non-singular and having closed timelike curves. It turns out that in higher dimensions horizon topology cannot be spherical but it has ...
  • Off-equatorial stable circular orbits for spinning particles 
    Mukherjee, Sajal (APS, 2018-10)
    n this article, we investigate the motion of a spinning particle at a constant inclination, different from the equatorial plane, around a Kerr black hole. We mainly explore the possibilities of stable circular orbits for ...
  • Periastron shift for a spinning test particle around naked singularities 
    Mukherjee, Sajal (APS, 2018-06)
    In the present article, we investigate the Periastron precession for a spinning test particle moving in nearly circular orbits around naked singularities. We consider two well-known solutions that can produce a spacetime ...
  • Possible connection between the reflection symmetry and existence of equatorial circular orbit 
    Mukherjee, Sajal (APS, 2021-05)
    We study a viable connection between the circular-equatorial orbits and reflection symmetry across the equatorial plane of a vacuum stationary axis-symmetric spacetime in general relativity. The behavior of the circular ...
  • Collisional Penrose process and jets in Kerr naked singularity 
    Mukherjee, Sajal (Springer, 2018-07)
    In this article, we investigate the possibilities of energy extraction from an over-spinning Kerr spacetime using collisional Penrose process. This phenomenon can produce a high-energy ejecta of particles under certain ...
  • Resonant orbits for a spinning particle in Kerr spacetime 
    Mukherjee, Sajal (APS, 2020-06)
    In the present article, we study the orbital resonance that corresponds to an extended object approximated up to the dipole order term in Kerr spacetime. We start with the Mathisson-Papapetrou equations under the linear ...
  • Multipole moments of compact objects with NUT charge: Theoretical and observational implications 
    Mukherjee, Sajal (APS, 2020-12)
    We derive the multipole moments of the Kerr-Newman-Unti-Tamburino (NUT) black hole spacetime using the Geroch-Hansen formalism, even though the spacetime is not asymptotically flat. Intriguingly, in the presence of the NUT ...
  • Gravitational wave observatories may be able to detect hyperbolic encounters of black holes 
    Mukherjee, Sajal (OUP, 2021-09)
    Gravitational wave (GW) astronomy promises to observe different kinds of astrophysical sources. Here, we explore the possibility of detection of GWs from hyperbolic interactions of compact stars with ground-based interferometric ...
  • Collisional Penrose process with spinning particles 
    Mukherjee, Sajal (Elsevier, 2018-03)
    In this article, we have investigated collisional Penrose process (CPP) using spinning particles in a Kerr spacetime. Recent studies have shown that the collision between two spinning particles can produce a significantly ...
  • On some novel features of the Kerr–Newman-NUT spacetime 
    Mukherjee, Sajal (Springer, 2019-02)
    In this work we have presented a special class of Kerr–Newman-NUT black hole, having its horizon located precisely at , for , where M, l, a and Q are respectively mass, NUT, rotation and electric charge parameters of the ...
  • Horndeski theories confront the Gravity Probe B experiment 
    Mukherjee, Sajal (APS, 2018-06)
    In this work we have investigated various properties of a spinning gyroscope in the context of Horndeski theories. In particular, we have focused on two specific situations—(a) when the gyroscope follows a geodesic trajectory ...
  • Constraining R Violation from Anomalous Abelian Family Symmetry 
    Vaidya, Rishikesh (ARXIV, 2002-03)
    The patterns of R violation resulting from imposition of a gauged U(1) horizontal symmetry, on the minimal supersymmetric standard model are systematically analyzed. We concentrate on a class of models with integer U(1) ...
  • Working group report: Beyond the standard model 
    Vaidya, Rishikesh (IAS, 2003)
    The working group on Beyond the StandardModel concentrated on identifying interesting physics issues in models of ‘new physics’ which go beyond the standard model. There were two aspects to this activity. One was to ...
  • Working group report: Low energy and flavour physics 
    Vaidya, Rishikesh (Springer, 2004-12)
    This is a report of the low energy and flavour physics working group at WHEPP-8, held at the Indian Institute of Technology, Mumbai, India, during 5–16 January 2004.
  • Radiative B decays in Supersymmetry without R-parity 
    Vaidya, Rishikesh (ARXIV, 2004-11)
    We present a systematic analysis of all the contributions at the leading log order to the branching ratio of the inclusive radiative B decay, B --> X_s + gamma in the framework of supersymmetry without R-parity. The relevant ...
  • Quark Loop Contribution to Neutron EDM from R-parity Violation 
    Vaidya, Rishikesh (ARXIV, 2005-05)
    We present a detailed analysis together with numerical calculations on one-loop contributions to the neutron electric dipole moment from supersymmetry without R parity, focusing on the quark-scalar loop contributions. ...
  • Working group report: Flavor physics and model building 
    Vaidya, Rishikesh (Springer, 2006-11)
    This is the report of flavor physics and model building working group at WHEPP-9. While activites in flavor physics have been mainly focused on B-physics, those in model building have been primarily devoted to neutrino ...
  • Working group report: Collider Physics 
    Vaidya, Rishikesh (Springer, 2006-10)
    This is summary of the activities of the working group on collider physics in the IXth Workshop on High Energy Physics Phenomenology (WHEPP-9) held at the Institute of Physics, Bhubaneswar, India in January 2006. Some of ...

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