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Non-extremal instantons and wormholes in string theory

✍ Scribed by E. Bergshoeff; A. Collinucci; U. Gran; D. Roest; S. Vandoren

Book ID
105357459
Publisher
John Wiley and Sons
Year
2005
Tongue
English
Weight
129 KB
Volume
53
Category
Article
ISSN
0015-8208

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✦ Synopsis

Abstract

We construct the most general non‐extremal spherically symmetric
instanton solution of a gravity‐dilaton‐axion system with SL(2, R) symmetry,
for arbitrary euclidean spacetime dimension D≥ 3. A subclass of these
solutions
describe completely regular wormhole geometries, whose size is
determined by an invariant combination of the SL(2, R) charges.

Our results can be applied to four‐dimensional effective actions of type II
strings compactified on a Calabi‐Yau manifold, and in particular to the
universal
hypermultiplet coupled to gravity. We show that these models contain
regular wormhole solutions, supported by regular
dilaton and RR scalar fields of the universal hypermultiplet.

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