θ Vacuum in a Random Matrix Model
Romuald A. Janik, Maciej A. Nowak, Gabor Papp, Ismail Zahed
Abstract
Inspired by recent lattice calculations, we model certain aspects of the θ-vacuum using a matrix model with gaussian weights. The vacuum energy exhibits a cusp at θ<π that is sensitive to both the accuracy of the numerical analysis and the maximum density of winding modes present in a finite volume.
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