Open-string models with broken supersymmetry

Details Open-string models with broken supersymmetry Open-string models with broken supersymmetry

2000-01-12

arxiv.org/abs/hep-th/0001077v2

Nucl.Phys.Proc.Suppl. 88 (2000) 160-167

Physics

High Energy Physics

High Energy Physics - Theory

18 pages, LATEX. Minor corrections. Contributed also to Como 2001 "Statistical Field Theory", Les Houches 2001 "Gravity, gauge

Scientific paper

10.1016/S0920-5632(00)00764-7

I review the salient features of three classes of open-string models with broken supersymmetry. These suffice to exhibit, in relatively simple settings, the two phenomena of ``brane supersymmetry'' and ``brane supersymmetry breaking''. In the first class of models, to lowest order supersymmetry is broken both in the closed and in the open sectors. In the second class of models, to lowest order supersymmetry is broken in the closed sector, but is {\it exact} in the open sector, at least for the low-lying modes, and often for entire towers of string excitations. Finally, in the third class of models, to lowest order supersymmetry is {\it exact} in the closed (bulk) sector, but is broken in the open sector. Brane supersymmetry breaking provides a natural solution to some old difficulties met in the construction of open-string vacua.

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