Half-BPS cosmic string in N=2 supergravity in the presence of a dilaton

Details Half-BPS cosmic string in N=2 supergravity in the presence of a dilaton Half-BPS cosmic string in N=2 supergravity in the presence of a dilaton

2006-10-11

arxiv.org/abs/hep-th/0610124v2

JHEP 0703:079,2007

Physics

High Energy Physics

High Energy Physics - Theory

52 pages; typos corrected

Scientific paper

10.1088/1126-6708/2007/03/079

We construct new half-BPS cosmic string solutions in D=4 N=2 supergravity compatible with a consistent truncation to N=1 supergravity where they describe D-term cosmic strings. The constant Fayet-Iliopoulos term in the N=1 D-term is not put in by hand but is geometrically engineered by a gauging in the mother N=2 supergravity theory. The coupling of the N=2 vector multiplets is characterized by a cubic prepotential admitting an axion-dilaton field, a common property of many compactifications of string theory. The axion-dilaton field survives the truncation to N=1 supergravity. On the string configuration the BPS equations constrain the dilaton to be an arbitrary constant. All the cosmic string solutions with different values of the dilaton have the same energy per unit length but different lenght scales.

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