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Two dimensional charged black holes in string theory can be obtained as exact(SL(2,R)xU(1))/U(1) quotient CFTs. The geometry of the quotient is induced fromthat of the group, and in particular includes regions beyond the black holesingularities. Moreover, wavefunctions in such black holes are obtained fromgauge invariant vertex operators in the SL(2,R) CFT, hence their behaviorbeyond the singularity is determined. When the black hole is charged we findthat the wavefunctions are smooth at the singularities. Unlike the unchargedcase, scattering waves prepared beyond the singularity are not fully reflected;part of the wave is transmitted through the singularity. Hence, the physicsoutside the horizon of a charged black hole is sensitive to conditions setbehind the past singularity.Comment: 19 pages, 5 figures; v2: refs added, minor typos corrected; v3:  references on the infinite blue shift at the inner horizon and minor  corrections adde

Beyond the singularity of the 2Dcharged black hole