Softly Broken MQCD and the Theta Angle

Abstract

We consider a family of non-supersymmetric MQCD five-brane configurations introduced by Witten, and discuss the dependence of the curves on the microscopic theta angle and its relation with CP. We find evidence for a non-trivial spectral flow of the curves (vacua) and for the level-crossing of adjacent curves at a particular value of the theta angle, with spontaneous breaking of CP symmetry, providing an MQCD analogue of the phase transitions in theta proposed by 't Hooft.

12 pages, references added. Version published in Phys. Lett. B

References in corpus (8)

• Confinement and Strings in MQCD
• Comments on the M Theory Approach to N=1 SQCD and Brane Dynamics
• BPS States and Minimal Surfaces
• Monopole Condensation and Confining Phase of N=1 Gauge Theories Via M Theory Fivebrane
• Four-dimensional BPS-spectra via M-theory
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• The Field Theory of Non-Supersymmetric Brane Configurations
• D0-Branes, Constrained Instantons and D=4 Super Yang-Mills Theories

Cited by in corpus (9)

• Brane Dynamics and Gauge Theory
• Whitham Hierarchies, Instanton Corrections and Soft Supersymmetry Breaking in N=2 SU(N) Super Yang-Mills Theory
• Domain Walls and Decay Rate of the Excited Vacua in the Large N Yang-Mills Theory
• Branes and Theta Dependence
• Precision "Measurements" of the $Q\bar{Q}$ Potential in MQCD
• Duality in Non-Supersymmetric MQCD
• D0-Branes as Instantons in D=4 Super Yang-Mills Theories
• Vacuum Structure of Softly Broken N=1 Supersymmetric QCD
• Quark Condensates in Non-Supersymmetric MQCD