The Finite Temperature Effective Potential for Local Composite Operators

Details The Finite Temperature Effective Potential for Local Composite Operators The Finite Temperature Effective Potential for Local Composite Operators

1997-04-04

arxiv.org/abs/hep-th/9704038v1

Mod.Phys.Lett. A12 (1997) 1003-1010

Physics

High Energy Physics

High Energy Physics - Theory

10 pages, plain Latex, 2 figures

Scientific paper

The method of the effective action for the composite operators $\Phi^2(x)$ and $\Phi^4(x)$ is applied to the termodynamics of the scalar quantum field with $\lambda\Phi^4$ interaction. An expansion of the finite temperature effective potential in powers of $\hbar$ provides successive approximations to the free energy with an effective mass and an effective coupling determined by the gap equations. The numerical results are studied in the space-time of one dimension, when the theory is equivalent to the quantum mechanics of an anharmonic oscillator. The approximations to the free energy show quick convergence to the exact result.

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