Time-dependent perturbations in two-dimensional string black holes

• Published in: Physics letters. B Vol. 297; no. 1; pp. 67 - 73
• Main Authors: Diamandis, G.A., Georgalas, B.C., Maintas, X., Mavromatos, N.E.
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 1992; Elsevier Science
• Subjects: Exact sciences and technology; General theory of fields and particles; Physics; The physics of elementary particles and fields; Theory of fundamental strings; String theory; Perturbation theory; Black hole; Two dimensional model; Metric
• ISSN: 0370-2693; 1873-2445
• DOI: 10.1016/0370-2693(92)91071-G

We discuss time-dependent perturbations (induced by matter fields) of a black-hole background in tree-level two-dimensional string theory. We analyse the linearized case and show the possibility of having black-hole solutions with time-dependent horizons. The latter exist only in the presence of time-dependent “tachyon” matter fields, which constitute the only propagating degrees of freedom in two-dimensional string theory. For real tachyon field configurations it is not possible to obtaine solutions with horizons shrinking to a point. On the other hand, such a possibility seems to be realized in the case of string black-hole models formulated on higher world-sheet genera. We connect this latter result with black-hole evaporation/decay at a quantum level.