
Finite temperature Euclidean two-point functions in quantum mechanics or quantum field theory are characterized by a discrete set of Fourier coefficients $G_{k}$, $k\in\mathbb Z$, associated with the Matsubara frequencies $��_{k}=2��k/��$. We show that analyticity implies that the coefficients $G_{k}$ must satisfy an infinite number of model-independent linear equations that we write down explicitly. In particular, we construct "Analytic Renormalization Group" linear maps $\mathsf A_��$ which, for any choice of cut-off $��$, allow to express the low energy Fourier coefficients for $|��_{k}|
52 pages, 25 figures; v2: a few comments and explanations added
High Energy Physics - Theory, Nuclear and High Energy Physics, Statistical Mechanics (cond-mat.stat-mech), High Energy Physics - Lattice (hep-lat), FOS: Physical sciences, Monte Carlo methods, QC770-798, Mathematical Physics (math-ph), Physique atomique et nucléaire, Renormalization group methods applied to problems in quantum field theory, High Energy Physics - Phenomenology, High Energy Physics - Lattice, High Energy Physics - Phenomenology (hep-ph), High Energy Physics - Theory (hep-th), Constructive quantum field theory, Nuclear and particle physics. Atomic energy. Radioactivity, Thermal quantum field theory, Condensed Matter - Statistical Mechanics, Mathematical Physics
High Energy Physics - Theory, Nuclear and High Energy Physics, Statistical Mechanics (cond-mat.stat-mech), High Energy Physics - Lattice (hep-lat), FOS: Physical sciences, Monte Carlo methods, QC770-798, Mathematical Physics (math-ph), Physique atomique et nucléaire, Renormalization group methods applied to problems in quantum field theory, High Energy Physics - Phenomenology, High Energy Physics - Lattice, High Energy Physics - Phenomenology (hep-ph), High Energy Physics - Theory (hep-th), Constructive quantum field theory, Nuclear and particle physics. Atomic energy. Radioactivity, Thermal quantum field theory, Condensed Matter - Statistical Mechanics, Mathematical Physics
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