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| Paper IPM / Physic / 6519 |
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| Abstract: | |||||
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The transformation of the SL(2,\BbbR)/ U(1)
black hole under a boost of the
subgroup U(1) is studied. It is found that the tachyon vertex operators of
the black hole go into those of the c=1 conformal field theory coupled to
gravity. The discrete states of the black hole also tend to the discrete
states of the 2-D gravity theory. The fate of the extra discrete states of
the black hole under boost are discussed
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