2018 Impact factor 2.481
Hadrons and Nuclei
Eur. Phys. J. A 2, 355-370

Correlation dynamics of Yukawa-theory in 1+1 dimensions

S. Juchem - W. Cassing - J.M. Häuser

Institut für Theoretische Physik, Universität Gießen, D-35392 Gießen, Germany

Received: 8 January 1998 / Revised version: 7 April 1998 Communicated by A. Schäfer

Abstract
Using the method of correlation dynamics we investigate the properties of a field-theory for fermions and scalar bosons coupled via a Yukawa interaction. Within this approach, which consists in an expansion of full equal-time Green functions into connected equal-time Green functions and a corresponding truncation of the hierarchy of equations of motion we carry out calculations up to 4th order in the connected Green functions and evaluate the effective potential of the theory in 1+1 dimensions on a torus. Comparing the different approximations we find a strong influence of the connected 4-point functions on the properties of the system.

PACS
11.10-z Field theory - 11.10.Ef Lagrangian and Hamiltonian approach - 11.15.Tk Other nonperturbativ techniques


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