Fourth order full quantum correlations from a Langevin-Schwinger-Dyson equation
High Energy Physics - Phenomenology
2010-04-23 v2
Abstract
It is well known that some quantum and statistical fluctuations of a quantum field may be recovered by adding suitable stochastic sources to the mean field equations derived from the Schwinger-Keldysh (Closed-time-path) effective action. In this note we show that this method can be extended to higher correlations and higher (n-particle irreducible) effective actions. As an example, we investigate three and fourth order correlations by adding stochastic sources to the Schwinger - Dyson equations derived from the 2-particle irreducible effective. This method is a simple way to investigate the nonlinear dynamics of quantum fluctuations.
Cite
@article{arxiv.0810.3239,
title = {Fourth order full quantum correlations from a Langevin-Schwinger-Dyson equation},
author = {Esteban Calzetta},
journal= {arXiv preprint arXiv:0810.3239},
year = {2010}
}
Comments
20 pages. Accepted for publication in J. Phys. A