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  • The basic physics of the binary black hole merger GW150914 
    Sengupta, Anand; Gaur, G. (Cornell University Library, 2016-08)
    The first direct gravitational-wave detection was made by the Advanced Laser Interferometer Gravitational Wave Observatory on September 14, 2015. The GW150914 signal was strong enough to be apparent, without using any ...
  • Boundary conservation from bulk symmetry 
    Fairoos, C.; Ghosh, Avirup; Sarkar, Sudipta (Cornell University Library, 2017-05)
    The evolution of the black hole horizon can be effectively captured by a fictitious membrane fluid living on the stretched horizon. We show that the dynamics of this boundary matter arises from the invariance of the bulk ...
  • Bounding the boundless: constraining topological Gauss-Bonnet coupling from GW150914 
    Chakravarti, Kabir; Ghosh, Rajes; Sarkar, Sudipta (Cornell University Library, 2022-01)
    Recent gravitational wave observation based on the data from GW150914 has firmly confirmed Hawking's area theorem and estimated the increase in total horizon area during a merger process of two Kerr black holes. We use ...
  • Characterization of the LIGO detectors during their sixth science run 
    Sengupta, Anand (Cornell University Library, 2014-10)
    In 2009-2010, the Laser Interferometer Gravitational-wave Observa- tory (LIGO) operated together with international partners Virgo and GEO600 as a network to search for gravitational waves of astrophysical origin. The ...
  • Comprehensive all-sky search for periodic gravitational waves in the sixth science run LIGO data 
    Sengupta, Anand (Cornell University Library, 2016-05)
    We report on a comprehensive all-sky search for periodic gravitational waves in the frequency band 100-1500 Hz and with a frequency time derivative in the range of [−1.18,+1.00]×10−8 Hz/s. Such a signal could be produced ...
  • Constraining extra dimensions using observations of black hole quasi-normal modes 
    Mishra, Akash K.; Ghosh, Abhirup; Chakraborty, Sumanta (Cornell University Library, 2021-06)
    The presence of extra dimensions generically modify the spacetime geometry of a rotating black hole, by adding an additional hair, besides the mass M and the angular momentum J, known as the 'tidal charge' parameter, ?. ...
  • Constraining scalar-gauss-bonnet inflation by reheating, unitarity and PLANCK 
    Bhattacharjee, Srijit; Maity, Debaprasad; Mukherjee, Rupak (Cornell University Library, 2016-04)
    We revisit the inflationary dynamics in detail for theories with Gauss-Bonnet gravity coupled to scalar functions in light of PLANCK. Considering a chaotic inflationary scenario for two models involving inflaton-Gauss-Bonnet ...
  • Degenerate spacetimes in first order gravity 
    Kaul, Romesh K.; Sengupta, Sandipan (Cornell University Library, 2016-02)
    We present a systematic framework to obtain the most general solutions of the equations of motion in first order gravity theory with degenerate tetrads. There are many possible solutions. Generically, these exhibit ...
  • A directed search for gravitational waves from Scorpius X-1 with initial LIGO 
    Sengupta, Anand (Cornell University Library, 2014-12)
    We present results of a search for continuously-emitted gravitational radiation, directed at the brightest low-mass X-ray binary, Scorpius X-1. Our semi-coherent analysis covers 10 days of LIGO S5 data ranging from 50-550 ...
  • Displacement memory effect near the horizon of black holes 
    Bhattacharjee, Srijit; Kumar, Shailesh; Bhattacharyya, Arpan (Cornell University Library, 2020-11)
    We study the displacement memory effect and its connection with the extended-BMS symmetries near the horizon of black holes. Considering the near-horizon asymptotic metrics, we show there is a permanent shift in the geodesic ...
  • Double layers in Weyl geometry and some physical implications 
    Berezin, Victor; Dharmadarshi, Kushan (Cornell University Library, 2021-02)
    In this thesis, we attempt to gain a more complete insight into Double Layer Theories in Weyl Gravity. In order to do this, we first establish the premise of Weyls Theory, including its provenance, development and flaws. ...
  • GW170817: Measurements of neutron star radii and equation of state 
    Sengupta, Anand (Cornell University Library, 2018-05)
    On 17 August 2017, the LIGO and Virgo observatories made the first direct detection of gravitational waves from the coalescence of a neutron star binary system. The detection of this gravitational-wave signal, GW170817, ...
  • Higgs vacuum stability and inflationary dynamics in the light of BICEP2 results 
    Bhattacharya, Kaushik; Chakrabortty, Joydeep; Das, Suratna; Mondal, Tanmoy (Cornell University Library, 2014-08)
    Recent detection of B−mode polarization of the Cosmic Microwave Background by BICEP2 observations has surprisingly put the inflationary scale near Grand Unification scale if one considers single-field inflationary models. ...
  • An improved analysis of GW150914 using a fully spin-precessing waveform model 
    Sengupta, Anand; Gaur, G. (Cornell University Library, 2016-06)
    This paper presents updated estimates of source parameters for GW150914, a binary black-hole coalescence event detected by the Laser Interferometer Gravitational-wave Observatory (LIGO) on September 14, 2015 [1]. Reference ...
  • Improved upper limits on the stochastic gravitational-wave background from 2009-2010 LIGO and Virgo data 
    Sengupta, Anand (Cornell University Library, 2014-06)
    Gravitational waves from a variety of sources are predicted to superpose to create a stochastic background. This background is expected to contain unique information from throughout the history of the universe that is ...
  • Naked Singularities are not Singular in Distorted Gravity 
    Majumder, Barun; Garattini, Remo (arXiv, Cornell University Library, 2013-11)
    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. ...
  • Narrow-band search of continuous gravitational-wave signals from Crab and Vela pulsars in Virgo VSR4 data 
    Sengupta, Anand (arXiv, Cornell University Library, 2014-10)
    In this paper we present the results of a coherent narrow-band search for continuous gravitationalwave signals from the Crab and Vela pulsars conducted on Virgo VSR4 data. In order to take into account a possible small ...
  • Overcharging black holes and cosmic censorship in Born-Infeld gravity 
    Jana, Soumya; Shaikh, Rajibul; Sarkar, Sudipta (Cornell University Library, 2018-08)
    The Born-Infeld gravity is a modification of the theory of general relativity inspired by the nonlinear Born-Infeld electrodynamics. The theory is described by a series of higher curvature terms added to the Einstein-Hilbert ...
  • Partial islands and subregion complexity in geometric secret-sharing model 
    Bhattacharya, Aranya; Bhattacharyya, Arpan; Nandy, Pratik; Patra, Ayan K. (Cornell University Library, 2021-09)
    We compute the holographic subregion complexity of a radiation subsystem in a geometric secret-sharing model of Hawking radiation in the "complexity=volume" proposal. The model is constructed using multiboundary wormhole ...
  • Physical process first law and caustic avoidance for Rindler horizon 
    Bhattacharjee, Srijit; Sarkar, Sudipta (arXiv Cornell University Library, 2014-12)
    We study the perturbation induced by a slowly rotating massive object as it passes through a Rindler horizon. It is shown that the passage of this object can be approximately modeled as Delta\,function type tidal distortions ...

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