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Non‐extremal instantons and wormholes in string theory
Author(s) -
Bergshoeff E.,
Collinucci A.,
Gran U.,
Roest D.,
Vandoren S.
Publication year - 2005
Publication title -
fortschritte der physik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.469
H-Index - 71
eISSN - 1521-3978
pISSN - 0015-8208
DOI - 10.1002/prop.200410227
Subject(s) - wormhole , instanton , dilaton , physics , mathematical physics , string theory , compactification (mathematics) , spacetime , scalar (mathematics) , theoretical physics , invariant (physics) , manifold (fluid mechanics) , pure mathematics , mathematics , quantum mechanics , geometry , mechanical engineering , engineering
We construct the most general non‐extremal spherically symmetricinstanton solution of a gravity‐dilaton‐axion system with SL (2, R ) symmetry,for arbitrary euclidean spacetime dimension D ≥ 3. A subclass of thesesolutionsdescribe completely regular wormhole geometries, whose size isdetermined by an invariant combination of the SL (2, R ) charges. Our results can be applied to four‐dimensional effective actions of type IIstrings compactified on a Calabi‐Yau manifold, and in particular to theuniversalhypermultiplet coupled to gravity. We show that these models containregular wormhole solutions, supported by regulardilaton and RR scalar fields of the universal hypermultiplet.