# Quasi-particle re-summation and integral gap equation in thermal field theory

@article{LeClair2004QuasiparticleRA, title={Quasi-particle re-summation and integral gap equation in thermal field theory}, author={Andr{\'e} LeClair}, journal={Journal of High Energy Physics}, year={2004}, volume={2005}, pages={068-068} }

A new approach to quantum field theory at finite temperature and density in arbitrary space-time dimension D is developed. We focus mainly on relativistic theories, but the approach applies to non-relativistic ones as well. In this quasi-particle re-summation, the free energy takes the free-field form but with the one-particle energy ?() replaced by ?(), the latter satisfying a temperature-dependent integral equation with kernel related to a zero temperature form-factor of the trace of stress…

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