BPS D-branes from an Unstable D-brane

Details BPS D-branes from an Unstable D-brane BPS D-branes from an Unstable D-brane

2005-09-14

arxiv.org/abs/hep-th/0509104v1

Physics

High Energy Physics

High Energy Physics - Theory

4 pages, to appear in the proceeding of PASCOS 2005, Gyeongju, Korea, May 30-June 4, 2005

Scientific paper

10.1063/1.2149742

We search for exact tachyon kink solutions of DBI type effective action describing an unstable D-brane with worldvolume gauge field turned in both the flat and a curved background. There are various kinds of solutions in the presence of electromagnetic fields in the flat space, such as periodic arrays, topological tachyon kinks, half kinks, and bounces. We identify a BPS object, D($p$-1)F1 bound state, which describes a thick brane with string flux density. The curved 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 in the curved background 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 ${\rm S}^3$.

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