BPS D-branes from an Unstable D-brane in a Curved Background

Details BPS D-branes from an Unstable D-brane in a Curved Background BPS D-branes from an Unstable D-brane in a Curved Background

2005-04-15

arxiv.org/abs/hep-th/0504130v2

Phys.Rev. D72 (2005) 026006

Physics

High Energy Physics

High Energy Physics - Theory

16 pages, 2 figures, a footnote added, typos corrected and a reference added

Scientific paper

10.1103/PhysRevD.72.026006

We find exact tachyon kink solutions of DBI type effective action describing an unstable D5-brane with worldvolume gauge field turned on in a curved background. The background of interest is the ten-dimensional lift of the Salam-Sezgin vacuum and, in the asymptotic limit, it approaches ${\rm R}^{1,4}\times {\rm T}^2\times {\rm S}^3$. The solutions are identified as composites of lower-dimensional D-branes and fundamental strings, and, in the BPS limit, they become a D4D2F1 composite wrapped on ${\rm R}^{1,2}\times {\rm T}^2$ where ${\rm T}^2$ is inside ${\rm S}^3$. In one class of solutions we find an infinite degeneracy with respect to a constant magnetic field along the direction of NS-NS field on ${\rm S}^3$.

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