Superradiance around rotating dilatonic black holes

Jun ichirou Koga, Kei ichi Maeda

研究成果: Article査読

14 被引用数 (Scopus)

抄録

We consider a superradiance effect around rotating dilatonic black holes. We analyze two cases: one is an exact solution with the coupling constant α = 3, which effective action is reduced from the 5-dimensional Kaluza-Klein theory, and the other is a slowly rotating dilatonic black holes with arbitrary coupling constant. We find that there exists a critical value (α ∼ 1), which is predicted from a superstring model, and the superradiant emission rate with coupling larger than the critical value becomes much higher than the Kerr-Newman case (α = 0) in the maximally charged limit. Consequently, 4-dimensional primordial black holes in higher dimensional unified theories are either rotating but almost neutral or charged but effectively non-rotating.

本文言語English
ページ(範囲)29-34
ページ数6
ジャーナルPhysics Letters B
340
1-2
DOI
出版ステータスPublished - 1994 12 1

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

引用スタイル