A copy of this work was available on the public web and has been preserved in the Wayback Machine. The capture dates from 2017; you can also visit the original URL.
The file type is application/pdf.
Dependence of variational perturbation expansions on strong-coupling behavior: Inapplicability ofδexpansion to field theory
2003
Physical Review D, Particles and fields
Preserved Fulltext
Other Versions
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-coupling, or scaling limit. Otherwise the procedure either does not converge at all or to the wrong limit. This invalidates all papers applying the so-called delta-expansion to quantum field theory.
doi:10.1103/physrevd.68.065001
fatcat:r3p5a4bebna2nh2qpcnnjcpfty