Non-BPS Branes in a Type I Orbifold

Details Non-BPS Branes in a Type I Orbifold Non-BPS Branes in a Type I Orbifold

2000-09-27

arxiv.org/abs/hep-th/0009224v2

JHEP 0105:056,2001

Physics

High Energy Physics

High Energy Physics - Theory

32 pages, LaTeX, no figures. Stability analysis has been corrected: the D-particle is found to be stable

Scientific paper

10.1088/1126-6708/2001/05/056

We analyse the spectrum of non-BPS branes in the type I theory on the orbifold $T^4/{\cal I}_4$. We present a detailed analysis of the action of the worldsheet parity $\Omega$ on the different D-brane boundary state sectors of type IIB on $T^4/{\cal I}_4$, using the covariant formulation. Using these results we derive the spectrum of branes in the type I orbifold. We find $\Z_2$- and $\Z$- charged non-BPS branes. A study of the stability of these branes in the type I orbifold is also presented. We find that the type I non-BPS D-particle and D-instanton remain stable in the orbifold. The D-particle carries no charge whereas the non-BPS D-instanton can carry twisted R-R charge.

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