Sparse modeling approach to extract spectral functions with covariance of Euclidean-time correlators of lattice QCD

2023/11/26 by Junichi Takahashi, Takahashi, Junichi, H. Ohno +3 · 1 citation
Physics and Astronomy · #Atomic and Subatomic Physics Research #FOS: Physical sciences #High Energy Physics - Lattice (hep-lat) #Quantum Chromodynamics and Particle Interactions #Theoretical and Computational Physics

paper · pdf · doi:10.48550/arxiv.2311.15233

openalex publication_date 2023/11/26 · openalex created_date 2023/11/29 · openalex updated_date 2026/07/28

Abstract

We present our sparse modeling study to extract spectral functions from Euclidean-time correlation functions. In this study covariance between different Euclidean times of the correlation function is taken into account, which was not done in previous studies. In order to check applicability of the method, we firstly test it with mock data which imitate possible charmonium spectral functions. Then, we extract spectral functions from correlation functions obtained from lattice QCD at finite temperature.

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• Sparse modeling study of extracting charmonium spectral functions from lattice QCD at finite temperature

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