Pad\'e approximants and analytic continuation of Euclidean Phi-derivable approximations

Autor:	Markó, Gergely, Reinosa, Urko, Szép, Zsolt
Rok vydání:	2017
Předmět:	High Energy Physics - Phenomenology High Energy Physics - Theory
Druh dokumentu:	Working Paper
DOI:	10.1103/PhysRevD.96.036002
Popis:	We investigate the Pad\'e approximation method for the analytic continuation of numerical data and its ability to access, from the Euclidean propagator, both the spectral function and part of the physical information hidden in the second Riemann sheet. We test this method using various benchmarks at zero temperature: a simple perturbative approximation as well as the two-loop Phi-derivable approximation. The analytic continuation method is then applied to Euclidean data previously obtained in the O(4) symmetric model (within a given renormalization scheme) to assess the difference between zero-momentum and pole masses, which is in general a difficult question to answer within nonperturbative approaches such as the Phi-derivable expansion scheme. Comment: 20 pages, 8 figures, uses RevTeX 4-1
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/1706.08726 Zobrazit plný text záznamu View this record from Arxiv