| DATE: |
2006-01-25 11:00 - |
| PLACE: |
Hon-kan Rm. 220 |
| TITLE: |
A Stringy-Small Black Ring |
| CONTACT: |
Tango |
| SPEAKER: |
Dr. Norihiro Iizuka (Dept. of Theoretical Physics, Tata institute of Fundamental Research) |
| LANGUAGE: |
English |
| ABSTRACT: |
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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