理論セミナー

日時: 2006-01-25 11:00 -
場所: 研究本館2階220号室
会議名: A Stringy-Small Black Ring
連絡先: 丹後
講演者: Dr. Norihiro Iizuka  (Dept. of Theoretical Physics, Tata institute of Fundamental Research)
講演言語: 英語
アブストラクト: We examine certain two-charge supersymmetric states with spin in five-dimensional string theories which can be viewed as a "small black ring" when the gravitational coupling is large. This is a very interesting object in the sense that it does not have an event horizon in the supergravity limit whereas it microscopically has a finite entropy. We give both indirect and direct evidence that non-vanishing horizon is formed for this "small black ring" by higher derivative corrections in string theory. Furthermore this stringy-horizon accout for the correct microscopic entropy to all orders in an asymptotic expansion, which is far more precise than Bekenstein-Hawking entropy formula.

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