Spectral analysis by the method of consistent constraints Посвящается юбилею Ю.М. Кагана
N. V. Prokof'ev+*, B. V. Svistunov*
+Department of Physics, University of Massachusetts, MA 01003 Amherst, USA
*Russian Research Center "Kurchatov Institute", 123182 Moscow, Russia
Abstract
Two major challenges of numeric analytic continuation - restoring
the spectral density, s(ω), from corresponding Matsubara correlator,
g(τ) - are (i) producing the most smooth/featureless answer for
s(ω), without compromising the error bars on g(τ), and (ii)
quantifying possible deviations of the produced result from the actual
answer. We introduce the method of consistent constraints that solves both
problems.