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On polarizations of non-luminal gravitational waves

Hiroaki Tahara

If GWs are subluminal or superluminal, there must be a special frame (e.g. unitary frame of a scalar tensor theory).
Although the simultaneous observations of binary merger with light and GWs have given a constraint on the speed of GWs around 100 Hz,
its propagation speed at lower frequency (<10 Hz) is still free from that constraint.
I will talk about polarizations of sub/superluminal GWs in Horndeski theory, considering the relative speed of the solar system to the unitary frame.


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Last-modified: 2021-02-23 (火) 00:09:47 (58d)