3 papers
math-ph2001
The W_t Transcendental Function and Quantum Mechanical Applications
V. E. Markushin, R. Rosenfelder, A. W. Schreiber
We discuss the function wt(x) defined via the implicit equation wt(x)*tan[wt(x)]=x which appears in certain quantum mechanical and field theoretic applications. We investigate its…
hep-ph1999
Comment on the paper: ``Feynman-Schwinger representation approach to nonperturbative physics'' by C. Savkli et al. [Phys. Rev. C 60, 055210 (1999), hep-ph/9906211]
R. Rosenfelder, A. W. Schreiber
We point out that the scalar Wick-Cutkosky model (with interaction) used in this study has been known for a long time to be unstable. However, the numerical results present…
hep-th1998
The Feynman Variational Principle in the Worldline Representation of Field Theory
R. Rosenfelder, C. Alexandrou, A. W. Schreiber
Following Feynman's treatment of the non-relativistic polaron problem, similar techniques are used to study relativistic field theories: after integrating out the bosonic degrees o…