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arXiv · hep-ph/0105214

Mass Expansions of Screened Perturbation Theory

Jens. O Andersen·Michael Strickland
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Abstract

The thermodynamics of massless phi^4-theory is studied within screened perturbation theory (SPT). In this method the perturbative expansion is reorganized by adding and subtracting a mass term in the Lagrangian. We analytically calculate the pressure and entropy to three-loop order and the screening mass to two-loop order, expanding in powers of m/T. The truncated m/T-expansion results are compared with numerical SPT results for the pressure, entropy and screening mass which are accurate to all orders in m/T. It is shown that the m/T-expansion converges quickly and provides an accurate description of the thermodynamic functions for large values of the coupling constant.

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Jens. O Andersen, Michael Strickland. 2001-08-08. Mass Expansions of Screened Perturbation Theory. https://doi.org/10.1103/physrevd.64.105012

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