NSPT on the twisted Eguchi-Kawai model yields gradient flow coupling coefficients whose flow-time dependence reproduces the universal one-loop beta function and, with large errors, a two-loop value.
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The perturbative computation of the gradient flow coupling for the twisted Eguchi-Kawai model with the numerical stochastic perturbation theory
NSPT on the twisted Eguchi-Kawai model yields gradient flow coupling coefficients whose flow-time dependence reproduces the universal one-loop beta function and, with large errors, a two-loop value.