Testing the No-Hair Theorem with Sgr A*

Advances in Astronomy

Review Article

Tim Johannsen¹ 

[1] Physics Department, University of Arizona, 1118 E. 4th Street, Tucson, AZ 85721, USA, arizona.edu

Others  :  1267893
DOI  :  10.1155/2012/486750

 received in 2011-05-16, accepted in 2011-07-05,  发布年份 2011

【 摘 要 】

The no-hair theorem characterizes the fundamental nature of black holes in general relativity. This theorem can be tested observationally by measuring the mass and spin of a black hole as well as its quadrupole moment, which may deviate from the expected Kerr value. Sgr A*, the supermassive black hole at the center of the Milky Way, is a prime candidate for such tests thanks to its large angular size, high brightness, and rich population of nearby stars. In this paper, I discuss a new theoretical framework for a test of the no-hair theorem that is ideal for imaging observations of Sgr A* with very long baseline interferometry (VLBI). The approach is formulated in terms of a Kerr-like spacetime that depends on a free parameter and is regular everywhere outside of the event horizon. Together with the results from astrometric and timing observations, VLBI imaging of Sgr A* may lead to a secure test of the no-hair theorem.

【 授权许可】

CC BY   
Copyright © 2012 Tim Johannsen. 2012

【 图 表 】

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Figure 7

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