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28 papers · 2 filters
General relativity, torsion, and quantum theory
Tejinder P. Singh
We recall some of the obstacles which arise when one tries to reconcile the general theory of relativity with quantum theory. We consider the possibility that gravitation theories…
A Proposed Search for the Detection of Gravitational Waves from Eccentric Binary Black Holes
Vaibhav Tiwari, Sergey Klimenko, Nelson Christensen +14
Most of compact binary systems are expected to circularize before the frequency of emitted gravitational waves (GWs) enters the sensitivity band of the ground based interferometric…
Impact of gravitational radiation higher order modes on single aligned-spin gravitational wave searches for binary black holes
Juan Calderón Bustillo, Sascha Husa, Alicia M. Sintes +1
Current template-based gravitational wave searches for compact binary coalescences (CBC) use waveform models that neglect the higher order modes content of the gravitational radiat…
Spherical vacuum and scalar collapse for the Starobinsky R^2 model
Jun-Qi Guo, Pankaj S. Joshi
Spherical vacuum and scalar collapse for the Starobinsky R^2 model is simulated. Obtained by considering the quantum-gravitational effects, this model would admit some cases of sin…
All-sky search for long-duration gravitational wave transients with LIGO
The LIGO Scientific Collaboration, the Virgo Collaboration, B. P. Abbott +934
We present the results of a search for long-duration gravitational wave transients in two sets of data collected by the LIGO Hanford and LIGO Livingston detectors between November…
A search of the Orion spur for continuous gravitational waves using a "loosely coherent" algorithm on data from LIGO interferometers
J. Aasi, B. P. Abbott, R. Abbott +920
We report results of a wideband search for periodic gravitational waves from isolated neutron stars within the Orion spur towards both the inner and outer regions of our Galaxy. As…
Infinite efficiency of collisional Penrose process: Can over-spinning Kerr geometry be the source of ultra-high-energy cosmic rays and neutrinos ?
Mandar Patil, Tomohiro Harada, Ken-ichi Nakao +2
The origin of the ultra-high-energy particles we receive on the Earth from the outer space such as EeV cosmic rays and PeV neutrinos remains an enigma. All mechanisms known to us c…
Intertial Frame Dragging in an Acoustic Analogue spacetime
Chandrachur Chakraborty, Oindrila Ganguly, Parthasarathi Majumdar
We report an incipient exploration of the Lense-Thirring precession effect in a rotating \textit{acoustic analogue black hole} spacetime. An exact formula is deduced for the preces…
Frequency-domain gravitational waves from non-precessing black-hole binaries. II. A phenomenological model for the advanced detector era
Sebastian Khan, Sascha Husa, Mark Hannam +4
We present a new frequency-domain phenomenological model of the gravitational-wave signal from the inspiral, merger and ringdown of non-precessing (aligned-spin) black-hole binarie…
Frequency-domain gravitational waves from non-precessing black-hole binaries. I. New numerical waveforms and anatomy of the signal
Sascha Husa, Sebastian Khan, Mark Hannam +4
In this paper we discuss the anatomy of frequency-domain gravitational-wave signals from non-precessing black-hole coalescences with the goal of constructing accurate phenomenologi…
Estimating effective higher order terms in the post-Newtonian binding energy and gravitational-wave flux: Non-spinning compact binary inspiral
Shasvath J. Kapadia, Nathan K. Johnson-McDaniel, Parameswaran Ajith
In the adiabatic post-Newtonian (PN) approximation, the phase evolution of gravitational waves (GWs) from inspiralling compact binaries in quasicircular orbits is computed by equat…
Compact objects from gravitational collapse: an analytical toy model
Pankaj S. Joshi, Daniele Malafarina
We develop here a procedure to obtain regular static configurations as resulting from dynamical gravitational collapse of a massive matter cloud in general relativity. Under certai…
Post-newtonian analysis of precessing convention for spinning compact binaries
Anuradha Gupta, Achamveedu Gopakumar
A precessing source frame, constructed using the Newtonian orbital angular momentum , can be invoked to model inspiral gravitational waves from generic spinning co…
Some remarks on an old problem of radiation and gravity
C. S. Unnikrishnan, George T. Gillies
The assumed universality of the equivalence principle suggests that a particle in a gravitational field has identical physics to one in an accelerated frame. Yet, energy considerat…
Quantum Gravito-Optics: A Light Route from Semiclassical Gravity to Quantum Gravity
C. S. Unnikrishnan, George T. Gillies
Quantum gravity remains an elusive theory, in spite of our thorough understanding of the quantum theory and the general theory of relativity separately, presumably due to the lack…
Mass inflation and curvature divergence near the central singularity in spherical collapse
Jun-Qi Guo, Pankaj S. Joshi, Jose T. Galvez Ghersi
We study spherical scalar collapse toward a black hole formation and examine the asymptotic dynamics near the central singularity of the formed black hole. It is found that, in the…
Interior dynamics of neutral and charged black holes in f(R) gravity
Jun-Qi Guo, Pankaj S. Joshi
In this paper, we explore the interior dynamics of neutral and charged black holes in gravity. We transform gravity from the Jordan frame into the Einstein frame and…
Binary Neutron Stars with Generic Spin, Eccentricity, Mass ratio, and Compactness - Quasi-equilibrium Sequences and First Evolutions
Tim Dietrich, Niclas Moldenhauer, Nathan K. Johnson-McDaniel +4
Information about the last stages of a binary neutron star inspiral and the final merger can be extracted from quasi-equilibrium configurations and dynamical evolutions. In this ar…
Interior dynamics of neutral and charged black holes
Jun-Qi Guo, Pankaj S. Joshi
In this paper, we explore the interior dynamics of neutral and charged black holes. Scalar collapses in flat, Schwarzschild, and Reissner-Nordstrom geometries are simulated. We exa…
Time-domain inspiral templates for spinning compact binaries in quasi-circular orbits
Anuradha Gupta, Achamveedu Gopakumar
We present a prescription to compute the time-domain gravitational wave (GW) polarization states associated with spinning compact binaries inspiraling along quasi-circular orbits.…
Estimating parameters of binary black holes from gravitational-wave observations of their inspiral, merger and ringdown
Archisman Ghosh, Walter Del Pozzo, Parameswaran Ajith
We characterize the expected statistical errors with which the parameters of black-hole binaries can be measured from gravitational-wave (GW) observations of their inspiral, merger…
Cosmological Constant, Quantum Measurement, and the Problem of Time
Shreya Banerjee, Sayantani Bera, Tejinder P. Singh
Three of the big puzzles of theoretical physics are the following: (i) There is apparently no time evolution in the dynamics of quantum general relativity, because the allowed quan…
Cosmic Acceleration in a Model of Fourth Order Gravity
Shreya Banerjee, Nilesh Jayswal, Tejinder P. Singh
We investigate a fourth order model of gravity, having a free length parameter, and no cosmological constant or dark energy. We consider cosmological evolution of a flat Friedmann…
Gravitational Lensing by Self-Dual Black Holes in Loop Quantum Gravity
Satyabrata Sahu, Kinjalk Lochan, D. Narasimha
We study gravitational lensing by a recently proposed black hole solution in Loop Quantum Gravity. We highlight the fact that the quantum gravity corrections to the Schwarzschild m…