21 citations · 84 across the 11 of their papers we have counts for
11 papers
Variational Perturbation Theory for Fokker-Planck Equation with Nonlinear Drift
Jens Dreger, Axel Pelster, Bodo Hamprecht
We develop a recursive method for perturbative solutions of the Fokker-Planck equation with nonlinear drift. The series expansion of the time-dependent probability density in terms…
End-to-End Distribution Function
B. Hamprecht, W. Janke, H. Kleinert
We set up and solve a recursion relation for all even moments of a two-dimensional stiff polymer (Porod-Kratky wormlike chain) and determine from these moments a simple analytic ex…
End-To-End Distribution Function Function of Stiff Polymers for all Persistence Lengths
B. Hamprecht, H. Kleinert
We set up recursion relations for calculating all even moments of the end-to-end distance of a Porod-Kratky wormlike chains in dimensions. From these moments we derive a simple…
Summing Non-Borel Tunnelling Amplitudes by Variational Perturbation Theory
B. Hamprecht, H. Kleinert
We present a method for extracting tunnelling amplitudes from perturbation expansions which are always divergent and not Borel-summable. We show that they can be evaluated by an an…
Variational Perturbation Theory for Summing Divergent Non-Borel-Summable Tunneling Amplitudes
B. Hamprecht, H. Kleinert
We present a method for evaluating divergent non-Borel-summable series by an analytic continuation of variational perturbation theory. We demonstrate the power of the method by an…
Dependence of Variational Perturbation Expansions on Strong-Coupling Behavior. Inapplicability of delta-Expansion to Field Theory
B. Hamprecht, H. Kleinert
We show that in applications of variational theory to quantum field theory it is essential to account for the correct Wegner exponent omega governing the approach to the strong-cou…