4 papers
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…
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…
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…
Dimensionally Regularized Study of Nonperturbative Quenched QED
Andreas W. Schreiber, Tom Sizer, Anthony G. Williams
We study the dimensionally regularized fermion propagator Dyson-Schwinger equation in quenched nonperturbative QED in an arbitrary covariant gauge using the Curtis-Pennington verte…