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23 papers · 2 filters
Constraints on cosmic strings using data from the first Advanced LIGO observing run
The LIGO Scientific Collaboration, the Virgo Collaboration, B. P. Abbott +1042
Cosmic strings are topological defects which can be formed in GUT-scale phase transitions in the early universe. They are also predicted to form in the context of string theory. Th…
All-sky search for long-duration gravitational wave transients in the first Advanced LIGO observing run
The LIGO Scientific Collaboration, the Virgo Collaboration, B. P. Abbott +990
We present the results of a search for long-duration gravitational wave transients in the data of the LIGO Hanford and LIGO Livingston second generation detectors between September…
Effectual gravitational-wave template banks for coalescing compact binaries using a hybrid placement algorithm
Soumen Roy, Anand S. Sengupta, Parameswaran Ajith
Recent discoveries of gravitational wave (GW) signals from astrophysical compact binary systems of neutron stars and black holes have firmly established them as prime sources for a…
Accretion-induced spin-wandering effects on the neutron star in Scorpius X-1: Implications for continuous gravitational wave searches
Arunava Mukherjee, Chris Messenger, Keith Riles
The LIGO's discovery of binary black hole mergers has opened up a new era of transient gravitational wave astronomy. The potential detection of gravitational radiation from another…
GW170817: Observation of Gravitational Waves from a Binary Neutron Star Inspiral
The LIGO Scientific Collaboration, The Virgo Collaboration
On August 17, 2017 at 12:41:04 UTC the Advanced LIGO and Advanced Virgo gravitational-wave detectors made their first observation of a binary neutron star inspiral. The signal, GW1…
GW170814: A Three-Detector Observation of Gravitational Waves from a Binary Black Hole Coalescence
The LIGO Scientific Collaboration, the Virgo Collaboration, B. P. Abbott +1107
On August 14, 2017 at 10:30:43 UTC, the Advanced Virgo detector and the two Advanced LIGO detectors coherently observed a transient gravitational-wave signal produced by the coales…
GW170817: Implications for the Stochastic Gravitational-Wave Background from Compact Binary Coalescences
The LIGO Scientific Collaboration, the Virgo Collaboration, B. P. Abbott +1099
The LIGO Scientific and Virgo Collaborations have announced the first detection of gravitational waves from the coalescence of two neutron stars. The merger rate of binary neutron…
First narrow-band search for continuous gravitational waves from known pulsars in advanced detector data
The LIGO Scientific Collaboration, the Virgo Collaboration, B. P. Abbott +1096
Spinning neutron stars asymmetric with respect to their rotation axis are potential sources of continuous gravitational waves for ground-based interferometric detectors. In the cas…
Effects of Data Quality Vetoes on a Search for Compact Binary Coalescences in Advanced LIGO's First Observing Run
The LIGO Scientific Collaboration, the Virgo Collaboration, B. P. Abbott +957
The first observing run of Advanced LIGO spanned 4 months, from September 12, 2015 to January 19, 2016, during which gravitational waves were directly detected from two binary blac…
First search for nontensorial gravitational waves from known pulsars
The LIGO Scientific Collaboration, the Virgo Collaboration, B. P. Abbott +1050
We present results from the first directed search for nontensorial gravitational waves. While general relativity allows for tensorial (plus and cross) modes only, a generic metric…
Accurate inspiral-merger-ringdown gravitational waveforms for non-spinning black-hole binaries including the effect of subdominant modes
Ajit Kumar Mehta, Chandra Kant Mishra, Vijay Varma +1
We present an analytical waveform family describing gravitational waves (GWs) from the inspiral, merger and ringdown of non-spinning black-hole binaries including the effect of sev…
Solving post-Newtonian accurate Kepler Equation
Yannick Boetzel, Abhimanyu Susobhanan, Achamveedu Gopakumar +2
We provide an elegant way of solving analytically the third post-Newtonian (3PN) accurate Kepler equation, associated with the 3PN-accurate generalized quasi-Keplerian parametrizat…
On the stability of a superspinar
Ken-ichi Nakao, Pankaj S. Joshi, Jun-Qi Guo +5
The superspinar proposed by Gimon and Horava is a rapidly rotating compact entity whose exterior is described by the over-spinning Kerr geometry. The compact entity itself is expec…
All-sky Search for Periodic Gravitational Waves in the O1 LIGO Data
LIGO Scientific Collaboration, Virgo Collaboration, B. P. Abbott +1042
We report on an all-sky search for periodic gravitational waves in the frequency band 20-475 Hz and with a frequency time derivative in the range of [-1.0, +0.1]e-8 Hz/s. Such a si…
First low-frequency Einstein@Home all-sky search for continuous gravitational waves in Advanced LIGO data
The LIGO Scientific Collaboration, the Virgo Collaboration, B. P. Abbott +1039
We report results of a deep all-sky search for periodic gravitational waves from isolated neutron stars in data from the first Advanced LIGO observing run. This search investigates…
GW170104: Observation of a 50-Solar-Mass Binary Black Hole Coalescence at Redshift 0.2
The LIGO Scientific Collaboration, the Virgo Collaboration, B. P. Abbott +1048
We describe the observation of GW170104, a gravitational-wave signal produced by the coalescence of a pair of stellar-mass black holes. The signal was measured on January 4, 2017 a…
Search for gravitational waves from Scorpius X-1 in the first Advanced LIGO observing run with a hidden Markov model
The LIGO Scientific Collaboration, the Virgo Collaboration, B. P. Abbott +1043
Results are presented from a semi-coherent search for continuous gravitational waves from the brightest low-mass X-ray binary, Scorpius X-1, using data collected during the first A…
A new length scale for quantum gravity
Tejinder P. Singh
We show why and how Compton wavelength and Schwarzschild radius should be combined into one single new length scale, which we call the Compton-Schwarzschild length. Doing so offers…
A new length scale, and modified Einstein-Cartan-Dirac equations for a point mass
Tejinder P. Singh
We have recently proposed a new action principle for combining Einstein equations and the Dirac equation for a point mass. We used a length scale , dubbed the Compton-Schwa…
Constraints on Modified Gravity Models from White Dwarfs
Srimanta Banerjee, Swapnil Shankar, Tejinder P. Singh
Modified gravity theories can introduce modifications to the Poisson equation in the Newtonian limit. As a result, we expect to see interesting features of these modifications insi…
Testing general relativity using gravitational wave signals from the inspiral, merger and ringdown of binary black holes
Abhirup Ghosh, Nathan K. Johnson-McDaniel, Archisman Ghosh +6
Advanced LIGO's recent observations of gravitational waves (GWs) from merging binary black holes have opened up a unique laboratory to test general relativity (GR) in the highly re…
Search for intermediate mass black hole binaries in the first observing run of Advanced LIGO
The LIGO Scientific Collaboration, the Virgo Collaboration, B. P. Abbott +1040
During their first observational run, the two Advanced LIGO detectors attained an unprecedented sensitivity, resulting in the first direct detections of gravitational-wave signals…
Directional limits on persistent gravitational waves from Advanced LIGO's first observing run
The LIGO Scientific Collaboration, the Virgo Collaboration, B. P. Abbott +993
We employ gravitational-wave radiometry to map the gravitational waves stochastic background expected from a variety of contributing mechanisms and test the assumption of isotropy…