Relic gravitational waves (GWs) can be produced by primordial magnetic fields. However, not much is known about the resulting GW amplitudes and their dependence on details of generation mechanism. Here we treat field through chiral effect (CME) as a generic mechanism explore its speed (the product diffusivity characteristic wavenumber) characterizing maximum strength expected from CME. When lat...

We investigate physical implications of a gravitational analog axion electrodynamics with parity-violating gravitoelectromagnetic theta term. This is related to the Nieh-Yan topological invariant in gravity torsion, contrast well-studied Chern-Simons term quadratic curvature, coupled via dynamical axionlike scalar field. Axion gravitodynamics corresponding linearized theory. find that potential...

Gravitational waves emitted by chirping supermassive black hole binaries could in principle be used to obtain very accurate distance determinations. Provided they have an electromagnetic counterpart from which the redshift can be determined, these standard sirens could be used to build a high redshift Hubble diagram. Errors in the distance measurements will most likely be dominated by gravitati...

Interferometers with kilometer-scale arms have been built for gravitational-wave detections on the ground; ones with much longer arms are being planned for space-based detection. One fundamental motivation for long baseline interferometry is from displacement noise. In general, the longer the arm length L, the larger the motion the gravitationalwave induces on the test masses, until L becomes c...

In the present attempt, flow behavior and thermal convection of one type of nanofluids in a disc geometry was investigated using Computational Fluid Dynamics (CFD). Influence of gravity induced sedimentation also has been studied. The commercial software, Fluent 6.2, has been employed to solve the governing equations. A user defined function was added to apply a uniform external ma...

We observed the effect of radiation pressure on the angular sensing and control system of the Laser Interferometer Gravitational-Wave Observatory (LIGO) interferometer's core optics at LIGO Hanford Observatory. This is the first measurement of this effect in a complete gravitational-wave interferometer. Only one of the two angular modes survives with feedback control, because the other mode is ...

The proposed Laser Interferometer Space Antenna is expected to detect gravitational waves from neutron stars and stellar-mass black holes spiraling into supermassive black holes in distant galactic nuclei. Analysis of the inspiral events will require careful comparison of the observed signals with theoretical waveform templates. The comparison could be seriously compromised if non-gravitational...

In this article, we continue A. Labeyrie’s work concerning the detection of Gravitational Waves through the deformations of optical wavefronts. We give the analytical expressions of the wavefront distortions. Special attention is paid to the discussion of this approach with respect to other works. The wavefront distortions are expected to cause a scintillation effect for a distant observer. The...

Starting with the flat space-time relativistic versions of Maxwell-Heaviside’s toy model vector theory of gravity and introducing the gravitational analogues for the electromagnetic Lienard-Wiechert potentials together with the notion of a gravitational Thomas Precession; the observed anomalous perihelion advance of Mercury’s orbit is here explained as a relativistic effect in flat (Minkowski) ...

Here, cosmology is obtained from the variable gravitational constant G ∝ φ with φ(x) being a scalar and its fluctuations around the ground state. The gravitational action contains Einstein-Hilbert like term with variable G, kinetic energy and self-interaction potential for φ(x). Two phase transitions take place in this model. The first one takes place at the GUT (grand unified theory) scale ∼ 2...