Improved hard-thermal-loop effective actions

Details Improved hard-thermal-loop effective actions Improved hard-thermal-loop effective actions

1997-07-31

arxiv.org/abs/hep-ph/9707538v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

14 pages, 5 figures, Latex using sprocl.sty and epsfig.sty. Invited talk given at SEWM '97, May 22--25, 1997, Eger, Hungary

Scientific paper

Hard thermal loop effective actions furnish the building blocks of resummed thermal perturbation theory, which is expected to work as long as the quantities under consideration are not sensitive to the nonperturbative (chromo-)magnetostatic sector. A different breakdown of perturbation theory occurs whenever external momenta are light-like, because the hard thermal loops themselves develop collinear singularities. By additionally resumming asymptotic thermal masses for hard modes these singularities are removed while leaving the gauge invariance of the effective action intact.

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