20 citations · 76 across the 7 of their papers we have counts for
7 papers
Convergence properties of the cluster expansion for equal-time Green functions in scalar theories
A. Peter, W. Cassing, J. M. Hauser +1
We investigate the convergence properties of the cluster expansion of equal-time Green functions in scalar theories with quartic self-coupling in (0+1), (1+1), and (2+1) space-time…
Cluster Expansion Approach to the Effective Potential in -Theory
Andreas Peter, Joern M. Haeuser, Markus H. Thoma +1
We apply a truncated set of dynamical equations of motion for connected equal-time Green functions up to the 4-point level to the investigation of spontaneous ground state symmetry…
Connected Green function approach to ground state symmetry breaking in -theory
J. M. Haeuser, W. Cassing, A. Peter +1
Using the cluster expansions for n-point Green functions we derive a closed set of dynamical equations of motion for connected equal-time Green functions by neglecting all connecte…
Two-Body Correlations in Pionic Systems
J. M. Haeuser, W. Cassing, A. Peter
In close analogy to fermionic many-body theory the truncation of the bosonic BBGKY density matrix hierarchy on the two-body level leads to a coupled set of nonlinear equations of m…
Constraint Correlation Dynamics of SU(N) Gauge Theories
S. J. Wang, W. Cassing, J. M. Haeuser +2
A constraint correlation dynamics up to 4-point Green functions is proposed for SU(N) gauge theories which reduces the N-body quantum field problem to the two-body level. The resul…
Vibrations versus collisions and the iterative structure of two-body dynamics
Alfred Pfitzner, Wolfgang Cassing, Andreas Peter
We adopt a truncated version of two-body dynamics by neglecting three-body correlations, as is supported by microscopic numerical calculations. Introducing orthogonal channel corre…