Gravitational wave signal from massive gravity

Gravitational Higgs Mechanism and Massive Gravity

In [1], in the context of domain wall backgrounds, it was shown that spontaneous breaking of diffeomorphism invariance results in gravitational Higgs mechanism. Recently in [2] ’t Hooft discussed gravitational Higgs mechanism in the context of obtaining massive gravity directly in four dimensions, and pointed out some subtleties with unitarity. We attribute these subtleties to breaking time-lik...

Gravitational Wave Bursts from the Galactic Massive Black Hole

The Galactic massive black hole (MBH), with a mass of M• = 3.6 × 106M⊙, is the closest known MBH, at a distance of only 8 kpc. The proximity of this MBH makes it possible to observe gravitational waves from stars with periapse in the observational frequency window of the Laser Interferometer Space Antenna (LISA ). This is possible even if the orbit of the star is very eccentric, so that the orb...

Gravitational Wave Emission From Core-Collapse of Massive Stars

We derive estimates for the characteristics of gravitational radiation from stellar collapse, using recent models of the core-collapse of Chandrasekhar mass white dwarfs (accretion induced collapse), core-collapse supernovae and collapsars, and the collapse of very massive stars (∼> 300M⊙). We study gravitational-wave emission mechanisms using several estimation techniques, including two-dimens...

Gravitational-wave probe of effective quantum gravity

Testing Gravity with Gravitational Wave Source Counts

We show that the gravitational wave source counts distribution can test how gravitational radiation propagates on cosmological scales. This test does not require obtaining redshifts for the sources. If the signal-to-noise ratio (SNR, ρ) from a gravitational wave source is proportional to the strain then it falls as R−1, thus we expect the source counts to follow dN/dρ ∝ ρ−4. However, if gravita...