HEP-TH-9405052 t o-dimensional w CERN-TH.7240/94 wn to b e consisten a 23, Switzerland ons in the t y h kground Bac in a Abstract Ulf H. Danielsson k-Hole Blac kground are studied. The results are sho The Scattering of Strings Theory Division, CERN, CH-1211 Genev k-hole bac In this pap er, correlation functions of tac y 1994 blac with the prediction of the deformed matrix mo del up to external leg factors. CERN-TH.7240/94 Ma
1 INTRODUCTION
In this letter, I will give some results on tachyon scattering amplitudes in
the background of a two-dimensional black hole [1, 2 ]. For this purp ose, I
will use the techniques develop ed in [3] based on Ward identities. The Ward
identities will provide p owerful constraints on the correlation functions that
are otherwise so hard to calculate. The black hole will b e constructed as a
p erturbation around the ordinary linear dilaton vacuum. Indeed, in [4] it was
shown that the action of the SL(2;R)=U (1) coset mo del [2], which describ es
atwo-dimensional black hole, can b e written as
Z
p
1
2R + M B ); (1) (@X @X + @@
2
where
p