Approximate gauge independence of the induced gravitational wave spectrum

Gravitational Wave – Gauge Field Oscillations

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...

Gravitational Wave Spectrum Induced by Primordial Scalar Perturbations

We derive the complete spectrum of gravitational waves induced by primordial scalar perturbations ranging over all observable wavelengths. This scalar-induced contribution can be computed directly from the observed scalar perturbations and general relativity and is, in this sense, independent of the cosmological model for generating the perturbations. The spectrum is scale-invariant on small sc...

Modeling the Complete Gravitational Wave Spectrum of Neutron Star Mergers.

In the context of neutron star mergers, we study the gravitational wave spectrum of the merger remnant using numerical relativity simulations. Postmerger spectra are characterized by a main peak frequency f2 related to the particular structure and dynamics of the remnant hot hypermassive neutron star. We show that f(2) is correlated with the tidal coupling constant κ(2)^T that characterizes the...

Massive to gauge field reduction and gravitational wave zone information

We show explicitly that massive, Abelian, vector – just like (properly defined) massive tensor – fields limit smoothly to their massless, gauge, versions: they emit only maximal helicity radiation and mediate Coulomb/“special relativistic Newtonian”, forces between their (conserved) sources. Our main motivation, though, is to show that LIGO’s gravitational wave detection probably cannot directl...

Electromagnetic radiation induced by a gravitational wave