Open-string models with broken supersymmetry

Abstract

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.

18 pages, LATEX. Minor corrections. Contributed also to Como 2001 "Statistical Field Theory", Les Houches 2001 "Gravity, gauge theories and strings", Johns Hopkins Workshop 2001

References in corpus (9)

• Brane Supersymmetry Breaking
• Anomaly Cancellations in the Type I D9-anti-D9 System and the USp(32) String Theory
• Comments on Open-String Orbifolds with a Non-Vanishing B_{ab}
• Tachyon-free Non-supersymmetric Type IIB Orientifolds via Brane-Antibrane Systems
• Dualities of Type 0 Strings
• Charged and Uncharged D-branes in various String Theories
• Non-Supersymmetric Type I Strings with Zero Vacuum Energy
• A Note on Orientifolds and Dualities of Type 0B String Theory
• On Non-tachyonic Z_N x Z_M Orientifolds of Type 0B String Theory

Cited by in corpus (8)

• Anomalous U(1)s masses in non-supersymmetric open string vacua
• Non-supersymmetric Tachyon-free Type-II and Type-I Closed Strings from RCFT
• A Stable Non-BPS Configuration From Intersecting Branes and Antibranes
• A Class of Non-Supersymmetric Open String Vacua
• A Classification of Toroidal Orientifold Models
• Thesis: Orientifolds, Anomalies and the Standard Model
• A class of non-supersymmetric orientifolds
• Forces between stable non-BPS branes