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- W1817361203 abstract "AbstractThe computation of order e 4 and e 5 contributions to the pressure of masslessquantum electrodynamics at a temperature T is overviewed.The thermodynamic properties ofaQED plasma may bedetermined fromthe par-tition function which can be obtained perturbatively using techniques borrowed fromfield theory at zero temperature (T). Indeed, the simplest approach to calculating thepartition function, or the free energy, is to use the imaginary-time formalism wherebythe Feynman rules are as at T = 0 but the energies take on discrete Matsubara values.However a naive application of these T = 0 like Feynman rules soon leads tothe appearance of power-like infrared (IR) singularities in diagrams. When these IRsingularities from an infinite set of diagrams are resummed, one obtains an expansionin√e 2 rather than e 2 , where e is the QED coupling. The best-known example ofthis phenomenon is the e 3 plasmon correction to the free energy of QED first foundby Gell-Mann and Brueckner [1] in the nonrelativistic context and later calculatedrelativistically [2]. Physically, the appearance of these IR singularities and the conse-quent breakdown of the naive perturbative expansion is due to the Debye screeningof electric fields in a plasma. Unlike at T = 0, the particles in the plasma are notfree (modulo ultraviolet renormalisations) but perpertually under the influence of thesurrounding particles.In the language of field theory, the Debye screening manifests itself by the non-vanishing limit Π" @default.
- W1817361203 created "2016-06-24" @default.
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- W1817361203 date "1995-02-01" @default.
- W1817361203 modified "2023-09-27" @default.
- W1817361203 title "THE FREE ENERGY OF HOT QED AT THREE AND A HALF LOOPS" @default.
- W1817361203 hasPublicationYear "1995" @default.
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