Universal 1020Hz stochastic gravitational waves from photon spheres of black holes
Abstract
We show that photon spheres of supermassive black holes generate high-frequency stochastic gravitational waves through the photon-graviton conversion. Remarkably, the frequency is universally determined as meme /mp 1020 Hz in terms of the proton mass mp and the electron mass me. It turns out that the density parameter of the stochastic gravitational waves gw could be 10-12. Since the existence of the gravitational waves from photon spheres is robust, it is worth seeking methods of detecting high-frequency gravitational waves around 1020Hz.
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