Vector dark radiation and gravitational-wave polarization

Gravitational Radiation – Observing the Dark and Dense

Astronomical observations in the electromagnetic window – microwave, radio and optical – have revealed that most of the Universe is dark. The only reason we know that dark matter exists is because of its gravitational influence on luminous matter. It is plausible that a small fraction of that dark matter is clumped, and strongly gravitating. Such systems are potential sources of gravitational r...

Polarization speed meter for gravitational-wave detection

Andrew R. Wade, Kirk McKenzie, Yanbei Chen, Daniel A. Shaddock, Jong H. Chow, and David E. McClelland Centre for Gravitational Physics, Department of Quantum Science, The Australian National University, Canberra, ACT, 0200, Australia Jet Propulsion Laboratory (JPL), California Institute of Technology, 4800 Oak Grove Drive, Pasadena, California 91109, USA Theoretical Astrophysics 350-17, Califor...

Electromagnetic radiation induced by a gravitational wave

Cherenkov Radiation in a Gravitational Wave Background

A covariant criterion for the emission of Cherenkov radiation in the field of a non-linear gravitational wave is considered in the framework of exact integrable models of particle dynamics and electromagnetic wave propagation. It is shown that vacuum interacting with curvature can give rise to Cherenkov radiation. The conically shaped spatial distribution of radiation is derived and its basic p...

Gravitational vacuum polarization as an alternative to dark matter

It is assumed that the quantum vacuum may be studied as consisting of two contributions, with positive and negative energy respectively, which interact but slightly and may be displaced from each other. Then it is proposed that dark matter may be just an increase of the quantum vacuum energy, with respect to the normal dark energy level, induced by the gravitational field of galaxies or cluster...