Penrose limits, the colliding plane-wave problem and the classical string backgrounds
| Autor: | Alexander Feinstein |
|---|---|
| Rok vydání: | 2002 |
| Předmět: |
High Energy Physics - Theory
Physics Physics and Astronomy (miscellaneous) Line element FOS: Physical sciences General Relativity and Quantum Cosmology (gr-qc) Space (mathematics) String theory String (physics) General Relativity and Quantum Cosmology Symmetry (physics) High Energy Physics::Theory Theoretical physics Singularity High Energy Physics - Theory (hep-th) Vacuum energy Universe (mathematics) |
| Zdroj: | Classical and Quantum Gravity. 19:5353-5360 |
| ISSN: | 0264-9381 |
| DOI: | 10.1088/0264-9381/19/21/304 |
| Popis: | We show how the Szekeres form of the line element is naturally adapted to study Penrose limits in classical string backgrounds. Relating the "old" colliding wave problem to the Penrose limiting procedure as employed in string theory we discuss how two orthogonal Penrose limits uniquely determine the underlying target space when certain symmetry is imposed. We construct a conformally deformed background with two distinct, yet exactly solvable in terms of the string theory on R-R backgrounds, Penrose limits. Exploiting further the similarities between the two problems we find that the Penrose limit of the gauged WZW Nappi-Witten universe is itself a gauged WZW plane wave solution of Sfetsos and Tseytlin. Finally, we discuss some issues related to singularity, show the existence of a large class of non-Hausdorff solutions with Killing Cauchy Horizons and indicate a possible resolution of the problem of the definition of quantum vacuum in string theory on these time-dependent backgrounds. Some misprints corrected. Matches the version in print. To appear in Classical & Quantum Gravity |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|