3 papers
hep-th1995
Convergent sequences of perturbative approximations for the anharmonic oscillator II. Compact time approach
B. Bellet, P. Garcia, A. Neveu
We present an alternative pathway in the application of the variation improvement of ordinary perturbation theory exposed in [1] which can preserve the internal symmetries of a mod…
hep-th1995
Convergent sequences of perturbative approximations for the anharmonic oscillator I. Harmonic approach
B. Bellet, P. Garcia, and A. Neveu
We present numerical evidence that a simple variational improvement of the ordinary perturbation theory of the quantum anharmonic oscillator can give a convergent sequence of appro…
hep-th1995
Variational solution of the Gross-Neveu model at finite temperature in the large N limit
Benoit Bellet, Philippe Garcia, Frederic Geniet +1
We use a nonperturbative variational method to investigate the phase transition of the Gross-Neveu model. It is shown that the variational procedure can be generalized to the finit…