Browsing Journal Articles by Title

Browsing Journal Articles by Title

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  • Garattini, Remo; Majumder, Barun (Elsevier, 2014-07)
    We compute the Zero Point Energy (ZPE) induced by a naked singularity with the help of a reformulation of the Wheeler–DeWitt equation. A variational approach is used for the calculation with Gaussian Trial Wave Functionals. ...
  • Sengupta, Anand (American Physical Society, 2015-01)
    In this paper we present the results of a coherent narrow-band search for continuous gravitational-wave signals from the Crab and Vela pulsars conducted on Virgo VSR4 data. In order to take into account a possible small ...
  • Hati, Chandan; Sarkar, Utpal (Springer Berlin Heidelberg, 2016-05)
    We propose a realization of mass varying neutrino dark energy in two extensions of the Standard Model (SM) with a dynamical neutrino mass related to the acceleron field while satisfying the naturalness. In the first scenario ...
  • Joshipura, Anjan S.; Nath, Newton (American Physical Society, 2016-08)
    We discuss the consequences of assuming that the (Majorana) neutrino mass matrix Mν and the charged lepton mass matrix Ml satisfy STνMνSν=−Mν and T†lMlM†lTl=MlM†l with respect to some discrete groups Sν and Tl contained ...
  • Deppisch, Frank F.; Hati, Chandan; Patra, Sudhanwa; Pritimita, Prativa; Sarkar, Utpal (American Physical Society, 2018-02)
    We discuss a class of left-right symmetric theories with a universal seesaw mechanism for fermion masses and mixing and the implications for neutrinoless double beta (0νββ)decay where neutrino masses are governed by natural ...
  • Ghosh, Monojit; Ghoshal, Pomita; Goswami, Srubabati; Nath, Newton; Raut, Sushant K. (American Physical Society, 2016-01)
    The three major unknown neutrino oscillation parameters at the present juncture are the mass hierarchy, the octant of the mixing angle θ23 and the CP phase δCP. It is well known that the presence of hierarchy-δCP and octant ...
  • K. N., Vishnudath; Choubey, Sandhya; Goswami, Srubabati (APS, 2019-05)
    We study the implications of the Dark-LMA (DLMA) solution to the solar neutrino problem for neutrinoless double beta decay (0???). We show that, while the predictions for the effective mass governing 0??? remain unchanged ...
  • Aarthy, Esakkiappan; Rai, Archita; Ganesh, Shashikiran; Vadawale, Santosh V. (Society of Photo-optical Instrumentation Engineers, 2019-08)
    Near infrared camera spectrograph and polarimeter (NICSPol) is a near-infrared (NIR) imaging polarimeter developed for the Near-Infrared Camera and Spectrograph (NICS), one of the backend instruments of the 1.2-m Cassegrain ...
  • Sengupta, Anand (IOP Science, 2014-05)
    The Numerical INJection Analysis (NINJA) project is a collaborative effort between members of the numerical relativity and gravitational-wave (GW) astrophysics communities. The purpose of NINJA is to study the ability to ...
  • Bhattacharjee, Srijit; Sarkar, Sudipta (American Physical Society, 2017-04)
    We prove the nonexistence of massive scalar, vector and tensor hairs outside the surface of a static and stationary compact reflecting star. Our result is the extension of the no-hair theorem for black holes to horizonless ...
  • Vaity, Pravin; Chithrabhanu, P.; Salla, Gangi Reddy; Prabhakar, Shashi; Singh, Ravindra P. (The Optical Society, 2016-02)
    Vector vortex beams are classified into four types depending upon spatial variation in their polarization vector. We have generated all four of these types of vector vortex beams by using a modified polarization Sagnac ...
  • Awada, Adel; Ali, Ahmed Farag; Majumder, Barun (IOP Publishing, 2013-10)
    In this work, we study FRW cosmologies in the context of gravity rainbow. We discuss the general conditions for having a nonsingular FRW cosmology in gravity rainbow. We propose that gravity rainbow functions can be fixed ...
  • Gupta, Shivangi; Naik, Sachindra; Jaisawal, Gaurava K. (Oxford University Press, 2019-12)
    We report the results obtained from a detailed timing and spectral studies of Be/X-ray binary pulsar 2S 1417?624 using data from Swift and NuSTAR observatories. The observations were carried out at the peak of a giant ...
  • Sengupta, Anand (American Physical Society, 2016-02)
    On September 14, 2015 at 09:50:45 UTC the two detectors of the Laser Interferometer Gravitational-Wave Observatory simultaneously observed a transient gravitational-wave signal. The signal sweeps upwards in frequency from ...
  • Sarkar, Ranadeep; Gopalswamy, Nat; Srivastava, Nandita (The American Astronomical Society, 2020-01)
    We report on an observationally constrained analytical model, the INterplanetary Flux ROpe Simulator (INFROS), for predicting the magnetic field vectors of coronal mass ejections (CMEs) in the interplanetary medium. The ...
  • Lal, Nijil; Shajilal, Biveen; Anwar, Ali; Perumangatt, Chithrabhanu; Singh, R. P. (AIP Publishing, 2019-11)
    Heralded single photon sources (HSPSs) from spontaneous parametric down-conversion are widely used as single photon sources. We study the photon number statistics of an HSPS carrying orbital angular momentum in our laboratory ...
  • Mandal, Subir; Pallamraju, Duggirala; Karan, Deepak K.; Phadke, Kedar A.; Singh, Ravindra P.; Suryawanshi, Pradip (Wiley, 2019-07)
    The importance of neutral wave dynamics in the understanding of the upper atmospheric processes is well?known. Conventionally, optical methods are used to derive information on the neutral wave dynamics by obtaining gravity ...
  • Pandey, Kuldeep; Sekar, R.; Anandarao, B. G.; Gupta, S. P.; Chakrabarty, D. (American Geophysical Union, 2018-03)
    Studies made earlier using ground-based observations of geomagnetic field over the Indian longitudes revealed that the occurrence of equatorial counter electrojet (CEJ) events in afternoon hours is more frequent during ...
  • Mishra, Akash; Chakraborty, Sumanta; Ghosh, Avirup; Sarkar, Sudipta (Springer, 2018-09)
    Physical process version of the first law of black hole mechanics relates the change in entropy of a perturbed Killing horizon, between two asymptotic cross sections, to the matter flow into the horizon. Here, we study the ...
  • Sengupta, Anand (IOP Publishing, 2017-12)
    On 2017 August 17 the merger of two compact objects with masses consistent with two neutron stars was discovered through gravitational-wave (GW170817), gamma-ray (GRB 170817A), and optical (SSS17a/AT 2017gfo) observations. ...

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