Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
1992-03-11
Phys.Lett. B289 (1992) 293-301
Physics
High Energy Physics
High Energy Physics - Theory
-- 15 pages, no figures
Scientific paper
10.1016/0370-2693(92)91222-U
The exact black hole solution of 2D closed string theory has, as any other maximally extended Schwarzschild-like geometry, two asymptotically flat spacetime domains. One can get rid of the second domain by gauging the discrete symmetry on the SL(2,R)/U(1) coset that interchanges the two asymptotic domains and preserves the Kruskal time orientation everywhere in the Kruskal plane. Here it is shown that upon performing this orbifold procedure, we obtain a theory of unoriented open and closed strings in a black hole background, with just one asymptotically flat domain and a time-like orbifold singularity at the origin. All of the open string states of the model are confined to the orbifold singularity. We also discuss various physical aspects of the truncated black hole, in particular its target duality -- the model is dual to a conventional open string theory in the black hole geometry.
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