Formation of correlations and energy-conservation at short times
K. Morawetz1 - H.S. Köhler2
1 Fachbereich Physik, Universität Rostock, D-18051 Rostock, Germany
2 Physics Department, University of Arizona, Tucson, Arizona 85721, USA
Received: 25 November 1998 / Revised version: 11 January 1999 Communicated by P. Povh
Abstract
The formation of correlations due to collisions in an interacting nucleonic
system is investigated. Results from one-time kinetic equations are compared with the
Kadanoff and Baym two-time equation with collisions included in Born approximation.
A reasonable agreement is found for a proposed approximation of the memory effects by a
finite duration of collisions. This form of collision integral is in agreement with
intuitive estimates from Fermi's golden rule. The formation of correlations and the build
up time is calculated analytically for the high temperature and the low temperature limit.
Different approximate expressions are compared with the numerical results. We present
analytically the time dependent interaction energy and the formation time for Gauß-
and Yukawa type of potentials.
PACS
05.20.Dd Kinetic theory -
24.10.Cn Many-body theory -
72.10.Bg General formulation of transport theory -
82.20.Mj Nonequilibrium kinetics
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