Four-loop screened perturbation theory

@article{Andersen2008FourloopSP,
  title={Four-loop screened perturbation theory},
  author={J. Andersen and Lars T. Kyllingstad},
  journal={Physical Review D},
  year={2008},
  volume={78},
  pages={076008}
}
We study the thermodynamics of massless {phi}{sup 4}-theory using screened perturbation theory. In this method, the perturbative expansion is reorganized by adding and subtracting a thermal mass term in the Lagrangian. We calculate the free energy through four loops expanding in a double power expansion in m/T and g{sup 2}, where m is the thermal mass and g is the coupling constant. The expansion is truncated at order g{sup 7} and the loop expansion is shown to have better convergence… Expand
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