IPMU seminar

Speaker: Hideki Maeda (Centro de Estudios Cientificos)
Title: Self-similar growth of black holes in the Friedmann universe
Date (JST): Mon, Feb 09, 2009, 13:30 - 15:00
Place: Seminar Room at IPMU Prefab. B
Related File: 42.pdf
Abstract: It is quite presumable from recent observations that there exists a huge black hole with millions of solar mass at the center of most galaxies. There are many scenarios proposed for the formation of such supermassive black holes. Among them, the scenario proposed by Zel' dovich and Novikov in 1967 is a very attractive one, in which a tiny black holes formed in the very early universe grows very rapidly in a self-similar manner and becomes a giant black hole. Realistic black holes, especially those in the early universe when the expansion effects are far from negligible, should be modeled by black hole solutions that include matter fields in an expanding universe. In order to clarify the possibility of the scenario by Zel'dovich and Novikov, we study the self-similar spherically symmetric solutions which are asymptotic to the Friedmann universe at spatial infinity. The (non)- existence of the solutions and the properties of the self-similar black holes in the presence of a scalar field or a perfect fluid are discussed.