Fractional S-branes on a Spacetime Orbifold

Details Fractional S-branes on a Spacetime Orbifold Fractional S-branes on a Spacetime Orbifold

2006-02-08

arxiv.org/abs/hep-th/0602083v1

Phys.Rev.D73:106004,2006

Physics

High Energy Physics

High Energy Physics - Theory

22 pages, 6 eps figures

Scientific paper

10.1103/PhysRevD.73.106004

Unstable D-branes are central objects in string theory, and exist also in time-dependent backgrounds. In this paper we take first steps to studying brane decay in spacetime orbifolds. As a concrete model we focus on the R^{1,d}/Z_2 orbifold. We point out that on a spacetime orbifold there exist two kinds of S-branes, fractional S-branes in addition to the usual ones. We investigate their construction in the open string and closed string boundary state approach. As an application of these constructions, we consider a scenario where an unstable brane nucleates at the origin of time of a spacetime, its initial energy then converting into energy flux in the form of closed strings. The dual open string description allows for a well-defined description of this process even if it originates at a singular origin of the spacetime.

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