Japan Geoscience Union Meeting 2021

Presentation information

[J] Poster

P (Space and Planetary Sciences ) » P-EM Solar-Terrestrial Sciences, Space Electromagnetism & Space Environment

[P-EM15] Space Plasma Physics: Theory and Simulation

Fri. Jun 4, 2021 5:15 PM - 6:30 PM Ch.05

convener:Takanobu Amano(Department of Earth and Planetary Science, University of Tokyo), Yohei Miyake(Education Center on Computational Science and Engineering, Kobe University), Takayuki Umeda(Institute for Space-Earth Environmental Research, Nagoya University), Tadas Nakamura(Fukui Prefectural University)

5:15 PM - 6:30 PM

[PEM15-P15] No Possibility of Generation of the Gravitational Wave from the Super Massive Black

*Hiroshi Oya1 (1.Department of Geophysics Graduate School for Science Tohoku University)

Keywords:Kerr Black Hole, Gravitational Wave, High Energy High Density Plasma

1. Introduction

Through the studies on the analyses of the FFT code detected by the decameter radio waves by the Tohoku University long base line interferometer for decameter radio wave, operated at 21.86MHz, it has been concluded that the waves are radiated from the binary black hole spinning at the center of our Galaxy. The binary consists of Gaa and Gab (temporally named) whose masses are 2.4 million and 1.9 million solar mass, respectively are rotating with period of 2200sec; the orbiting velocity of Gaa and Gab are 18 % and 22% of the light velocity, respectively.

(https://www.terrapub.co.jp/e-library/9784887041714/index.html)

For this conclusion, arguments are raised indicating the contradiction between current common knowledge on the generation of the gravitation waves that prohibit the stable orbital motion of the binary. With this background, present study is purposed to search for possibility of the generation of the gravitational waves in this case of the super massive black hole binary.

2. Possibility to Form Wide Space Inside of the Kerr Black Hole

The case of the super massive black hole, we can apply classical dynamics of the plasma physics because of the relatively tenuous nature of the inside material of the black hole compared with the case of star mass black hole. Start from the Einstein gravity equation we have investigated the force balance of the interior material of the Kerr black hole along the coordinate system following the geodesics ; especially we have employed the model of equal spinning velocity in the entire region of the core material of the black hole. In the case of the high speed rotation close to the light velocity where the special relativistic parameter, gamma is higher than 10 to 100 , the result has shown that the core material is condensed to 1/10 to 1/100 of the event horizon. That is, there exists wide range of vacuum area between the core material and the event horizon.

3 Generation and Propagation of the Gravitational Waves in the Interior of Kerr BH

The present study has shown that the generation of the gravitational waves is

possible from the condensed core material following the established theory of the gravitational waves from the quadrupole sources formed in the coordinate system whose origin is set at the center of the orbits of the binary. When we consider the space time of the interior of the Kerr black hole inside of the event horizon, however, it is indicated that there are region where the gravitational wave is stopped to propagate in whole directions, in term of the polar angle, with their corresponding distances from the source. The stopped waves start to return back taking the same route with forward propagation ; then form standing waves by encountering with forward propagating waves in whole area. Then, the gravitational waves that have origin at the core material of the black hole are not able to carry energy outside of the event horizon.

4. Conclusion

We conclude that no gravitational wave can carry energy outside of the event horizon of the super massive black hole.