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26 papers · 2 filters
Gravitational waves at their own gravitational speed
C. S. Unnikrishnan, George T. Gillies
Gravitational waves propagate at the speed of light in general relativity, because of its special relativistic basis. However, light propagation is linked to the electromagnetic ph…
Tests of General Relativity with GW170817
The LIGO Scientific Collaboration, the Virgo Collaboration, B. P. Abbott +1145
The recent discovery by Advanced LIGO and Advanced Virgo of a gravitational wave signal from a binary neutron star inspiral has enabled tests of general relativity (GR) with this n…
Globular clusters as a probe for Weyl Conformal Gravity
Tousif Islam
Eventual flattening of velocity dispersion profiles of some galactic globular clusters in the Milky Way cannot be explained in the framework of Newtonian gravity and hence in gener…
Space-time from collapse of the wave-function
Tejinder P. Singh
We propose that space-time results from collapse of the wave function of macroscopic objects, in quantum dynamics. We first argue that there ought to exist a formulation of quantum…
Search for gravitational waves from a long-lived remnant of the binary neutron star merger GW170817
The LIGO Scientific Collaboration, the Virgo Collaboration, B. P. Abbott +1138
One unanswered question about the binary neutron star coalescence GW170817 is the nature of its post-merger remnant. A previous search for post-merger gravitational waves targeted…
Overcharging black holes and cosmic censorship in Eddington-inspired Born-Infeld gravity
Soumya Jana, Rajibul Shaikh, Sudipta Sarkar
The Eddington-inspired Born-Infeld (EiBI) gravity is a modification of the theory of general relativity inspired by the nonlinear Born-Infeld electrodynamics. The theory is describ…
Testing Weyl Gravity at Galactic and Extra-galactic Scales
Koushik Dutta, Tousif Islam
We examine the viability of Weyl conformal gravity as an alternative to the general theory of relativity. By using the extended rotation curve of the Milky Way and velocity dispers…
Evading the theoretical no-go theorem for nonsingular bounces in Horndeski/Galileon cosmology
Shreya Banerjee, Yi-Fu Cai, Emmanuel N. Saridakis
We show that a nonsingular bounce, free of ghosts and gradient instabilities, can be realized in the framework of Horndeski or generalized Galileon cosmology. In particular, we fir…
Gravitational waves from compact binaries in post-Newtonian accurate hyperbolic orbits
Gihyuk Cho, Achamveedu Gopakumar, Maria Haney +1
We derive from first principles third post-Newtonian (3PN) accurate Keplerian-type parametric solution to describe PN-accurate dynamics of non-spinning compact binaries in hyperbol…
Wormholes with nonexotic matter in Born-Infeld gravity
Rajibul Shaikh
We show that, in contrast to general relativity, in Eddington-inspired Born-Infeld gravity (EiBI), a violation of the null convergence condition does not necessarily lead to a viol…
Bounce and cyclic cosmology in new gravitational scalar-tensor theories
Emmanuel N. Saridakis, Shreya Banerjee, R. Myrzakulov
We study the bounce and cyclicity realization in the framework of new gravitational scalar-tensor theories. In these theories the Lagrangian contains the Ricci scalar and its first…
Dynamics of Inflation and Dark Energy from Gravity
S. D. Odintsov, V. K. Oikonomou, S. Banerjee
In this work we study certain classes of gravity which have appealing phenomenological features, with respect to the successful realization of the dark energy and o…
Space and time as a consequence of GRW quantum jumps
Tejinder P. Singh
The Ghirardi-Rimini-Weber (GRW) theory of spontaneous collapse offers a possible resolution of the quantum measurement problem. In this theory, the wave function of a particle spon…
On Late Time Tails in an Extreme Reissner-Nordström Black Hole: Frequency Domain Analysis
Srijit Bhattacharjee, Bidisha Chakrabarty, David D. K. Chow +2
In this brief note, we revisit the study of the leading order late time decay tails of massless scalar perturbations outside an extreme Reissner-Nordström black hole. Previous auth…
GW170817: Measurements of Neutron Star Radii and Equation of State
The LIGO Scientific Collaboration, the Virgo Collaboration, B. P. Abbott +1149
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 th…
Properties of the binary neutron star merger GW170817
The LIGO Scientific Collaboration, the Virgo Collaboration, B. P. Abbott +1148
On August 17, 2017, the Advanced LIGO and Advanced Virgo gravitational-wave detectors observed a low-mass compact binary inspiral. The initial sky localization of the source of the…
A "no-hair" test for binary black holes
Siddharth Dhanpal, Abhirup Ghosh, Ajit Kumar Mehta +2
One of the consequences of the black-hole "no-hair" theorem in general relativity (GR) is that gravitational radiation (quasi-normal modes) from a perturbed Kerr black hole is uniq…
Einstein-Cartan-Dirac equations in the Newman-Penrose formalism
Swanand Khanapurkar, Abhinav Varma, Nehal Mittal +2
We formulate the Einstein-Cartan-Dirac equations in the Newman-Penrose (NP) formalism, thereby presenting a more accurate and explicit analysis of previous such studies. The equati…
Constraining black hole mimickers with gravitational wave observations
Nathan K. Johnson-McDaniel, Arunava Mukherjee, Rahul Kashyap +3
LIGO and Virgo have recently observed a number of gravitational wave (GW) signals that are fully consistent with being emitted by binary black holes described by general relativity…
Non-relativistic limit of Einstein-Cartan-Dirac equations
Swanand Khanapurkar, Arnab Pradhan, Vedant Dhruv +1
We derive the Schrödinger-Newton equation as the non-relativistic limit of the Einstein-Dirac equations. Our analysis relaxes the assumption of spherical symmetry, made in earlier…
A duality between curvature and torsion
Swanand Khanapurkar, Tejinder P. Singh
Compton wavelength and Schwarzschild radius are considered here as limiting cases of a unified length scale. Using this length, it is shown that the Dirac equation and the Einstein…
Shadows of rotating wormholes
Rajibul Shaikh
We study shadows cast by a certain class of rotating wormholes and point out the crucial role of a rotating wormhole throat in the formation of a shadow. Overlooking this crucial r…
Full Band All-sky Search for Periodic Gravitational Waves in the O1 LIGO Data
The LIGO Scientific Collaboration, the Virgo Collaboration, B. P. Abbott +1099
We report on a new all-sky search for periodic gravitational waves in the frequency band 475-2000 Hz and with a frequency time derivative in the range of [-1.0e-8, +1e-9] Hz/s. Pot…
A Search for Tensor, Vector, and Scalar Polarizations in the Stochastic Gravitational-Wave Background
The LIGO Scientific Collaboration, the Virgo Collaboration, B. P. Abbott +1097
The detection of gravitational waves with Advanced LIGO and Advanced Virgo has enabled novel tests of general relativity, including direct study of the polarization of gravitationa…