Stable vs Unstable Vortices in SQCD

Details Stable vs Unstable Vortices in SQCD Stable vs Unstable Vortices in SQCD

2005-06-21

arxiv.org/abs/hep-th/0506174v1

JHEP 0603 (2006) 023

Physics

High Energy Physics

High Energy Physics - Theory

32 pages, 6 figures

Scientific paper

10.1088/1126-6708/2006/03/023

We give a topological classification of stable and unconfined massive particles and strings (and some instantons) in worldvolume theories of M5-branes and their dimensional reductions, generalizing Witten's classification of strings in SYM. In particular 4d N=2 SQCD softly broken to N=1 contains torsion (Douglas-Shenker) Z_N-strings and nontorsion (Hanany-Tong) Z-strings. Some of the former are stable when the flavor symmetry is gauged, while those that are not stable confine quarks and in some vacua even dyons into baryons. The nontorsion strings are stable if and only if all colors are locked to flavors, which is weaker than the BPS condition. As a byproduct unstable string decay modes and approximate lifetimes are found. Cascading theories have no vortices stabilized by the topological charges treated here and in particular Gubser-Herzog-Klebanov axionic strings do not carry such a charge.

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