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37 papers · 2 filters
The most powerful astrophysical events: Gravitational-wave peak luminosity of binary black holes as predicted by numerical relativity
David Keitel, Xisco Jiménez Forteza, Sascha Husa +9
For a brief moment, a binary black hole (BBH) merger can be the most powerful astrophysical event in the visible universe. Here we present a model fit for this gravitational-wave p…
Upper Limits on the Stochastic Gravitational-Wave Background from Advanced LIGO's First Observing Run
The LIGO Scientific Collaboration, the Virgo Collaboration, B. P. Abbott +992
A wide variety of astrophysical and cosmological sources are expected to contribute to a stochastic gravitational-wave background. Following the observations of GW150914 and GW1512…
All-sky search for short gravitational-wave bursts in the first Advanced LIGO run
The LIGO Scientific Collaboration, the Virgo Collaboration, B. P. Abbott +986
We present the results from an all-sky search for short-duration gravitational waves in the data of the first run of the Advanced LIGO detectors between September 2015 and January…
Distinguishing Kerr naked singularities and black holes using the spin precession of a test gyro in strong gravitational fields
Chandrachur Chakraborty, Prashant Kocherlakota, Mandar Patil +3
We study here the precession of the spin of a test gyroscope attached to a stationary observer in the Kerr spacetime, specifically, to distinguish naked singularity (NS) from black…
Effects of waveform model systematics on the interpretation of GW150914
The LIGO Scientific Collaboration, the Virgo Collaboration, B. P. Abbott +999
Parameter estimates of GW150914 were obtained using Bayesian inference, based on three semi-analytic waveform models for binary black hole coalescences. These waveform models diffe…
Curious case of gravitational lensing by binary black holes: a tale of two photon spheres, new relativistic images and caustics
Mandar Patil, Priti Mishra, D. Narasimha
Binary black holes have been in limelight off late due to the detection of gravitational waves from coalescing compact binaries in the events GW150914 and GW151226. In this paper w…
The basic physics of the binary black hole merger GW150914
The LIGO Scientific Collaboration, the Virgo Collaboration, B. P. Abbott +953
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 eno…
Search for continuous gravitational waves from neutron stars in globular cluster NGC 6544
B. P. Abbott, R. Abbott, T. D. Abbott +953
We describe a directed search for continuous gravitational waves in data from the sixth LIGO science run. The target was the nearby globular cluster NGC 6544 at a distance of 2.7 k…
Results of the deepest all-sky survey for continuous gravitational waves on LIGO S6 data running on the Einstein@Home volunteer distributed computing project
The LIGO Scientific Collaboration, The Virgo Collaboration
We report results of a deep all-sky search for periodic gravitational waves from isolated neutron stars in data from the S6 LIGO science run. The search was possible thanks to the…
Non-minimally coupled dark fluid in Schwarzschild spacetime
Barnali Das, Kaushik Bhattacharya
If one assumes a particular form of non-minimal coupling, called the conformal coupling, of a perfect fluid with gravity in the fluid-gravity Lagrangian then one gets modified Eins…
GW151226: Observation of Gravitational Waves from a 22-Solar-Mass Binary Black Hole Coalescence
The LIGO Scientific Collaboration, the Virgo Collaboration
We report the observation of a gravitational-wave signal produced by the coalescence of two stellar-mass black holes. The signal, GW151226, was observed by the twin detectors of th…
Inspiral waveforms for spinning compact binaries in a new precessing convention
Anuradha Gupta, Achamveedu Gopakumar
It is customary to use a precessing convention, based on Newtonian orbital angular momentum , to model inspiral gravitational waves from generic spinning compact b…
Directly comparing GW150914 with numerical solutions of Einstein's equations for binary black hole coalescence
The LIGO Scientific Collaboration, the Virgo Collaboration, B. P. Abbott +979
We compare GW150914 directly to simulations of coalescing binary black holes in full general relativity, accounting for all the spin-weighted quadrupolar modes, and separately acco…
An improved analysis of GW150914 using a fully spin-precessing waveform model
The LIGO Scientific Collaboration, the Virgo Collaboration, B. P. Abbott +973
This paper presents updated estimates of source parameters for GW150914, a binary black-hole coalescence event detected by the Laser Interferometer Gravitational-wave Observatory (…
Binary Black Hole Mergers in the first Advanced LIGO Observing Run
The LIGO Scientific Collaboration, the Virgo Collaboration, B. P. Abbott +972
The first observational run of the Advanced LIGO detectors, from September 12, 2015 to January 19, 2016, saw the first detections of gravitational waves from binary black hole merg…
A First Targeted Search for Gravitational-Wave Bursts from Core-Collapse Supernovae in Data of First-Generation Laser Interferometer Detectors
B. P. Abbott, R. Abbott, T. D. Abbott +964
We present results from a search for gravitational-wave bursts coincident with a set of two core-collapse supernovae observed between 2007 and 2011. We employ data from the Laser I…
Quantum nonlocality, and the end of classical space-time
Shreya Banerjee, Sayantani Bera, T. P. Singh
Quantum non-local correlations and the acausal, spooky action at a distance suggest a discord between quantum theory and special relativity. We propose a resolution for this discor…
Comprehensive All-sky Search for Periodic Gravitational Waves in the Sixth Science Run LIGO Data
The LIGO Scientific Collaboration, the Virgo Collaboration, B. P. Abbott +959
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]\…
Spin precession in a black hole and naked singularity spacetimes
Chandrachur Chakraborty, Prashant Kocherlakota, Pankaj S. Joshi
We propose here a specific criterion to address the existence or otherwise of Kerr naked singularities, in terms of the precession of the spin of a test gyroscope due to the frame…
Bounce and cyclic cosmology in weakly broken galileon theories
Shreya Banerjee, Emmanuel N. Saridakis
We investigate the bounce and cyclicity realization in the framework of weakly broken galileon theories. We study bouncing and cyclic solutions at the background level, reconstruct…
GW150914: Implications for the stochastic gravitational wave background from binary black holes
The LIGO Scientific Collaboration, the Virgo Collaboration
The LIGO detection of the gravitational wave transient GW150914, from the inspiral and merger of two black holes with masses , suggests a population of…
Frame-dragging Effect in Strong Gravity Regime
Chandrachur Chakraborty
The exact frame-dragging (or Lense-Thirring (LT) precession) rates for Kerr, Kerr-Taub-NUT (KTN) and Taub-NUT spacetimes have been derived. Remarkably, in the case of the `zero ang…
Electromagnetic counterparts to gravitational waves from black hole mergers and naked singularities
Daniele Malafarina, Pankaj S. Joshi
We consider the question here whether the proposed electromagnetic counterpart of the gravitational wave signals in binary black hole coalescence may be due to the appearance of a…
Behavior of a test gyroscope moving towards a rotating traversable wormhole
Chandrachur Chakraborty, Parthapratim Pradhan
The geodesic structure of the Teo wormhole is briefly discussed and some observables are derived that promise to be of use in detecting a rotating traversable wormhole indirectly,…