Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2000-07-24
Phys.Rev. D63 (2001) 045016
Physics
High Energy Physics
High Energy Physics - Theory
34 pages, REVTEX, no figures. Further comments added
Scientific paper
10.1103/PhysRevD.63.045016
A method is presented for the computation of the one-loop effective action at finite temperature and density. The method is based on an expansion in the number of spatial covariant derivatives. It applies to general background field configurations with arbitrary internal symmetry group and space-time dependence. Full invariance under small and large gauge transformations is preserved without assuming stationary or Abelian fields nor fixing the gauge. The method is applied to the computation of the effective action of spin zero particles in 2+1 dimensions at finite temperature and density and in presence of background gauge fields. The calculation is carried out through second order in the number of spatial covariant derivatives. Some limiting cases are worked out.
Garcia-Recio Carmen
Salcedo L. L.
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