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Paper   IPM / P / 6482
School of Physics
  Title:   Gauging SL(2,R) and SL(2,R) ×U(1) by Their Nilpotent Subgroups
1.  F. Ardalan
2.  M. Alimohammadi
3.  H. Arfaei
  Status:   Published
  Journal: Int. J. Mod. Phys. A
  No.:  18
  Vol.:  10
  Year:  1995
  Pages:   115-131
  Supported by:  IPM
We consider the gauging of SL(2,R) and SL(2,R)×U(1) WZNW model by their nilpotent subgroups. The resulting space-times of the corresponding sigma models are seen to collapse to the one-dimensional Liouville theory in the first case, and lead to an extremal three-dimensional black string in the second case. We show that these results are also obtained by boosting the Witten black hole solution and Horne and Horowitz black string solution respectively.

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