Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2007-05-31
JHEP 0709:042,2007
Physics
High Energy Physics
High Energy Physics - Theory
28 pages, 4 figures;v2 references added & appear on JHEP
Scientific paper
10.1088/1126-6708/2007/09/042
Motivated by the possibility of formulating a strings/black hole correspondence in AdS space, we extract the Hagedorn behavior of thermal AdS_3 bosonic string from 1-loop partition function of SL(2,R) WZW model. We find that the Hagedorn temperature is monotonically increasing as the AdS radius shrinks, reaches a maximum of order of string scale set by the unitarity bound of the CFT for internal space. The resulting density of states near the Hagedorn temperature resembles the form as for strings in flat space and is dominated by the space-like long string configurations. We then argue a conjectured strings/black hole correspondence in AdS space by applying the Hagedorn thermodynamics. We find the size of the corresponding black hole is a function of the AdS radius. For large AdS radius a black hole far bigger than the string scale will form. On the contrary, when the AdS and string scales are comparable a string size black hole will form. We also examine strings on BTZ background obtained through SL(2,Z) transformation. We find a tachyonic divergence for a BTZ black hole of string scale size.
Lin Feng-Li
Matsuo Toshihiro
Tomino Dan
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