10,046 research outputs found
Explicit positive representation for weights on
It is an old idea to replace averages of observables with respect to a
complex weight by expectation values with respect to a genuine probability
measure on complexified space. This is precisely what one would like to get
from complex Langevin simulations. Unfortunately, these fail in many cases of
physical interest. We will describe method of deriving positive representations
by matching of moments and show simple examples of successful constructions. It
will be seen that the problem is greatly underdetermined.Comment: 8 pages, 3 figures. Material presented in Lattice 2017 conference in
Granad
Two-particle irreducible effective actions versus resummation: analytic properties and self-consistency
Approximations based on two-particle irreducible (2PI) effective actions
(also known as -derivable, Cornwall-Jackiw-Tomboulis or Luttinger-Ward
functionals depending on context) have been widely used in condensed matter and
non-equilibrium quantum/statistical field theory because this formalism gives a
robust, self-consistent, non-perturbative and systematically improvable
approach which avoids problems with secular time evolution. The strengths of
2PI approximations are often described in terms of a selective resummation of
Feynman diagrams to infinite order. However, the Feynman diagram series is
asymptotic and summation is at best a dangerous procedure. Here we show that,
at least in the context of a toy model where exact results are available, the
true strength of 2PI approximations derives from their self-consistency rather
than any resummation. This self-consistency allows truncated 2PI approximations
to capture the branch points of physical amplitudes where adjustments of
coupling constants can trigger an instability of the vacuum. This, in effect,
turns Dyson's argument for the failure of perturbation theory on its head. As a
result we find that 2PI approximations perform better than Pad\'e approximation
and are competitive with Borel-Pad\'e resummation. Finally, we introduce a
hybrid 2PI-Pad\'e method.Comment: Version accepted for publication in Nuclear Physics B. 31 pages, 16
figures. Uses feynm
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