Speaker
Kaishu Saito
(Kobe University)
Description
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 $m_e\sqrt{m_e /m_p} \simeq 10^{20} \text{Hz}$ in terms of the proton mass $m_p$ and the electron mass $m_e$.
It turns out that the density parameter of the stochastic gravitational waves $ \Omega_{ \text{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 $10^{20}$Hz.
Author
Kaishu Saito
(Kobe University)
Co-authors
Prof.
Jiro Soda
(Kobe University)
Dr
Hirotaka Yoshino
(Kobe University and Osaka city University)
