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arXiv · 1110.6300

Derivative expansion of the heat kernel at finite temperature

F. J. Moral-Gamez·L. L. Salcedo
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Abstract

The method of covariant symbols of Pletnev and Banin is extended to space-times with topology $\R^n\times S^1\times ... \times S^1$. By means of this tool, we obtain explicit formulas for the diagonal matrix elements and the trace of the heat kernel at finite temperature to fourth order in a strict covariant derivative expansion. The role of the Polyakov loop is emphasized. Chan's formula for the effective action to one loop is similarly extended. The expressions obtained formally apply to a larger class of spaces, $h$-spaces, with an arbitrary weight function $h(p)$ in the integration over the momentum of the loop.

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F. J. Moral-Gamez, L. L. Salcedo. 2011-12-15. Derivative expansion of the heat kernel at finite temperature. https://doi.org/10.1103/physrevd.85.045019

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