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Phase Transitions in Softly Broken N=2 SQCD at Non-zero Theta Angle

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arxiv hep-th/9608135 v1 pith:DHPOSPVO submitted 1996-08-20 hep-th

N. Evans , S.D.H. Hsu , M. Schwetz (Yale University) This is my paper · ORCID
classification hep-th
keywords thetaanglebreakingbrokennon-zerophasesoftlysqcd
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abstract

We investigate the behavior of softly broken $N=2$ SQCD at non-zero bare theta angle $\theta_0$, using superfield spurions to implement the SUSY breaking. We find a first-order phase transition as $\theta_0$ is varied from zero to $2 \pi$, in agreement with a prediction of `t Hooft. The low-energy theta angle $\theta_{eff}$, which determines the effective charges of dyonic excitations, has a complicated dependence on $\theta_0$ and breaking parameters.

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  1. Phase Transitions at Unusual Values of $\theta$

    hep-th 2025-06 conditional novelty 6.0 of 10

    Using Seiberg-Witten theory plus anomaly mediation, the authors find first-order phase transitions in the theta-dependent vacuum energy at theta = pi (N_F=0), 0 and pi (N_F=1), pi/2 and 3pi/2 (N_F=2), and pi/4, 3pi/4,...

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