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Volume 363 - 37th International Symposium on Lattice Field Theory (LATTICE2019) - Main session
Towards higher order numerical stochastic perturbation computation applied to the twisted Eguchi-Kawai model
A. Gonzalez-Arroyo, I. Kanamori, K.I. Ishikawa,* K. Miyahana, M. Okawa, R. Ueno
*corresponding author
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Pre-published on: 2020 January 03
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We have evaluated perturbation coefficients of Wilson loops up to $O(g^8)$ for the four-dimensional
twisted Eguchi-Kawai model using the numerical stochastic perturbation theory (NSPT) in [1].
In this talk we present a progress report on the higher order calculation up to $O(g^{63})$,
for which we apply a fast Fourier transformation (FFT) based convolution algorithm to the multiplication
of polynomial matrices in the NSPT aiming for higher order calculation.
We compare two implementations with the CPU-only version and the GPU version of the FFT based convolution algorithm, and
find a factor 9 improvement on the computational speed of the NSPT algorithm with SU($N=225$) at $O(g^{31})$.
The perturbation order dependence of the computational time, we investigate it up to $O(g^{63})$,
shows a mild scaling behavior on the truncation order.
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