Abstract
We study a unitary matrix model of the Gross-Witten-Wadia type, extended with the addition of characteristic polynomial insertions. The model interpolates between solvable unitary matrix models and is the unitary counterpart of a deformed Cauchy ensemble. Exact formulas for the partition function and Wilson loops are given in terms of Toeplitz determinants and minors and large N results are obtained by using Szegö theorem with a Fisher-Hartwig singularity. In the large N (planar) limit with two scaled couplings, the theory exhibits a surprisingly intricate phase structure in the two-dimensional parameter space.
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Russo, J.G., Tierz, M. Multiple phases in a generalized Gross-Witten-Wadia matrix model. J. High Energ. Phys. 2020, 81 (2020). https://doi.org/10.1007/JHEP09(2020)081
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DOI: https://doi.org/10.1007/JHEP09(2020)081