Mass Expansions of Screened Perturbation Theory

Details Mass Expansions of Screened Perturbation Theory Mass Expansions of Screened Perturbation Theory

2001-05-21

arxiv.org/abs/hep-ph/0105214v2

Phys.Rev. D64 (2001) 105012

Physics

High Energy Physics

High Energy Physics - Phenomenology

22 pages, 10 figures

Scientific paper

10.1103/PhysRevD.64.105012

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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