Physics – Condensed Matter – Statistical Mechanics
Scientific paper
2001-09-20
Phys.Rev. B65 (2002) 174512
Physics
Condensed Matter
Statistical Mechanics
9 pages; updated references
Scientific paper
10.1103/PhysRevB.65.174512
As a step towards deriving universal amplitude ratios of the superconductive phase transition we calculate the vacuum energy density in the symmetric phase of O(N)-symmetric scalar QED in D=4-epsilon dimensions in an epsilon-expansion using the minimal subtraction scheme commonly denoted by MS-bar. From the diverging parts of the diagrams, we obtain the renormalization constant of the vacuum Z_v which also contains information on the critical exponent alpha of the specific heat. As a side result, we use an earlier two-loop calculation of the effective potential (H.K. and B.VdB., Phys.Rev. E63 (2001) 056113, cond-mat/0104102) to determine the renormalization constant of the scalar field Z_phi up to two loops.
den Bossche Bruno Van
Kastening Boris
Kleinert Hagen
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