We consider gravitational self interaction in the lowest approximation and assume that graviton interacts with gravitational energy-momentum tensor in the same way as it interacts with particles. We show that, using gravitational vertex with a preferred gravitational energy-momentum tensor, it is possible to obtain a metric necessary for explaining perihelion precession. The preferred gravitati...

The first direct observation of gravitational waves’ action upon matter has recently been reported by the BICEP2 experiment. Advanced ground-based gravitational-wave detectors are being installed. They will soon be commissioned, and then begin searches for high-frequency gravitational waves at a sensitivity level that is widely expected to reach events involving compact objects like stellar mas...

Gravitational waves (GWs) emitted by binary sources are interesting signals for testing gravity on cosmological scales since they allow measurements of the luminosity distance. When followed electromagnetic counterparts, in particular, enable a reconstruction GW-distance-redshift relation. In context several modified (MG) theories, even when requiring that speed propagation is equal to light, t...

A recent study established a correspondence between the Generalized Uncertainty Principle (GUP) and Modified theories of gravity, particularly Stelle gravity. We investigate consequences this for inflation cosmological observables by evaluating power spectrum scalar tensor perturbations using two distinct methods. First, we employ PLANCK observations to determine GUP parameter γ0. Then, use val...

Strong gravitational lensing is a wave (GW) propagation effect that influences the inferred GW source parameters and cosmological environment. Identifying strongly-lensed images challenging as waveform amplitude magnification degenerate with shift in intrinsic mass redshift. However, even geometric-optics limit, type II cannot be fully matched by I (or unlensed) templates, especially large bina...

Gravitational waves propagating through a stationary gauge field transform into gauge field waves and back again. When multiple families of flavor-space locked gauge fields are present, the gravitational and gauge field waves exhibit novel dynamics. At high frequencies, the system behaves like coupled oscillators in which the gravitational wave is the central pacemaker. Due to energy conservati...

The sensitivity of resonant-mass gravitational-wave antennas has now reached h 10 ?18 , where h is the dimensionless metric perturbation caused by the wave. In order to observe gravitational wave events such as coalescing neutron star binaries and colliding black holes from as far as the Virgo cluster of galaxies, the detector sensitivity must be improved by three orders of magnitude. With such...