Half-BPS cosmic string in Script N = 2 supergravity in the presence of a dilaton
Abstract
We construct new half-BPS cosmic string solutions in D = 4 Script N = 2 supergravity compatible with a consistent truncation to Script N = 1 supergravity where they describe D-term cosmic strings. The constant Fayet-Iliopoulos term in the Script N = 1 D-term is not put in by hand but is geometrically engineered by a gauging in the mother Script N = 2 supergravity theory. The coupling of the Script 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 Script 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.
- Publication:
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Journal of High Energy Physics
- Pub Date:
- March 2007
- DOI:
- 10.1088/1126-6708/2007/03/079
- arXiv:
- arXiv:hep-th/0610124
- Bibcode:
- 2007JHEP...03..079E
- Keywords:
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- High Energy Physics - Theory
- E-Print:
- 52 pages