Expanding F-Theory

Details Expanding F-Theory Expanding F-Theory

2007-05-15

arxiv.org/abs/0705.2020v2

JHEP 0709:038,2007

Physics

High Energy Physics

High Energy Physics - Theory

13 pages v2: refs added

Scientific paper

10.1088/1126-6708/2007/09/038

We construct a general class of new time dependent solutions of non-linear sigma models coupled to gravity. These solutions describe configurations of expanding or contracting codimension two solitons which are not subject to a constraint on the total tension. The two dimensional metric on the space transverse to the defects is determined by the Liouville equation. This space can be compact or non-compact, and of any topology. We show that this construction can be applied naturally in type IIB string theory to find backgrounds describing a number of 7-branes larger than 24.

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