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We show that the two-point tree level amplitude in string theory in flat space is given by the standard free particle expression.
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N. Seiberg, Notes on quantum Liouville theory and quantum gravity , Prog. Theor. Phys. Suppl. 102
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H. Dorn and H. J. Otto, Two and three point functions in Liouville theory , Nucl. Phys. B429
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J. Polchinski, String Theory. Vol. 1: An Introduction to the Bosonic String . Cambridge Univ. Pr., UK, 1998
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D. Kutasov and N. Seiberg, More comments on string theory on AdS(3) , JHEP 04
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A. Giveon and D. Kutasov, Notes on AdS(3) , Nucl. Phys. B621
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