A Method for Direct Measurement of BH Spacetime

2016 Fiscal Year Final Research Report

• Project/Area Number: 26610050
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Astronomy
• Research Institution: Daido University
• Principal Investigator: Saida Hiromi 大同大学, 教養部, 准教授 (80367648)
• Research Collaborator: TAKAHASHI Masaaki ; NAMBU Yasusada ; TSUBOI Masato ; MIYOSHI Makoto ; KASUGA Takashi ; OKA Tomoharu
• Project Period (FY): 2014-04-01 – 2017-03-31
• Keywords: ブラックホール / 重力レンズ / 一般相対性理論

Outline of Final Research Achievements

Black Hole (BH) is the extremely strong gravitating region from which even the light (and the gravitational wave) cannot escape, and the BH cannot be observed by the usual observation method that detects lights emitted by celstial bodies. Then, referring to the BH uniqueness theorem proven by the general relativity (the BH is completely characterinzed by its mass and spin velocity), we have defined the "BH observation" as "to measure the mass and spin of the BH via observing the strong gravitational phenomena caused by the BH".
I have considered 2 light rays that emitted by a source located near the BH and reach a distant observer. The qunatities that I have analyzed are the delay between arrival times of the 2 rays and the ratio of intensities of the 2rays, and I proposed a principle of the "BH observation" in which the mass and spin of the BH are measured from the "time delay" and the "intensity ratio". In future studies, I will apply this principle to real observations.

Free Research Field

宇宙物理学