112 citations · 425 across the 33 of their papers we have counts for
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Perturbation Theory Without Diagrams: The Polaron Case
R. Rosenfelder
Higher-order perturbative calculations in Quantum (Field) Theory suffer from the factorial increase of the number of individual diagrams. Here I describe an approach which evaluate…
Perturbative Results Without Diagrams
R. Rosenfelder
Higher-order perturbative calculations in Quantum (Field) Theory suffer from the factorial increase of the number of individual diagrams. Here I describe an approach which evaluate…
An Abraham-Lorentz-like Equation for the Electron from the Worldline Variational Approach to QED
R. Rosenfelder, A. W. Schreiber
The variational equation for the mean square displacement of the electron in the polaron worldline approach to quenched QED can be cast into a form which closely resembles the clas…
Improved variational description of the Wick-Cutkosky model with the most general quadratic trial action
R. Rosenfelder, A. W. Schreiber
We generalize the worldline variational approach to field theory by introducing a trial action which allows for anisotropic terms to be induced by external 4-momenta of Green's fun…
What Can We Learn from QED at Large Couplings?
A. W. Schreiber, R. Rosenfelder, C. Alexandrou
In order to understand QCD at the energies relevant to hadronic physics one requires analytical methods for dealing with relativistic gauge field theories at large couplings. Stron…
Non-Perturbative Mass Renormalization in Quenched QED from the Worldline Variational Approach
C. Alexandrou, R. Rosenfelder, A. W. Schreiber
Following Feynman's successful treatment of the polaron problem we apply the same variational principle to quenched QED in the worldline formulation. New features arise from the de…
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…
Worldline path integral for the massive Dirac propagator : A four-dimensional approach
C. Alexandrou, R. Rosenfelder, A. W. Schreiber
We simplify and generalize an approach proposed by Di Vecchia and Ravndal to describe a massive Dirac particle in external vector and scalar fields. Two different path integral rep…