超巨大ブラックホール光子球からの高周波重力波

概要

There is one other reason why we consider SMBHs as candidates for GW
sources through the photon graviton conversion. That is the enormous photon
luminosity from the accretion disk. The accretion is the viscous fluid of plasma
which is ubiquitous around the BHs. The gravitational potential energy of the gas
is released as the thermal energy through viscosity, and consequently the disk intensely shines. Its maximal luminosity reaches
 the so-called Eddington luminosity
M
47
−1
. An enormous number of photons
given by LEdd ∼ 1.26 × 10 ergsec
109 M⊙
from the accretion disk are also supplied to the photon sphere, and this fact makes
the number of gravitons produced through the conversion effectively large. We
summarize the GW emission mechanism from our proposed source as in a cartoon
figure(see Fig.1.2). In the vicinity of the photon sphere, photons can propagate
at least the Schwarzschild radius in a strong magnetic field of order 10G. Therefore, the region around the photon sphere becomes an efficient zone of the photon
graviton conversion. Once an enormous amount of photons from the accretion disk
flows into this region, a part of it is converted to high-frequency GWs and emitted
to infinity. ...

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