Gravitational wave has now becomes a reality. It is analogous to the electromagnetic wave that is emitted by an accelerating charged object. What type of wave is it? A tensor, a vector or a scalar wave? With what speed does it travels? It composes of what fields and their relation to each other? How a tensor wave travels? Does it arise from dipole or quadruple radiation? What is its frequency range? Does it interfere with light? Any other physical properties does it carry?
In linear approximation it's tensor wave with spin 2. It's source is stress-energy tensor. Speed of light :)
@Youssef Khmou
The frequencies detected by LIGO from merger of two black holes swept upward in frequencies from 35 to 250 Hz. So it looks like wideband. According to Thome and Kip S. (Gravitational waves, Cornell University Library, 1995), gravitational waves are expected to have frequencies between 10^(-16) Hz and 10^4 Hz
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