Critical Behavior of a General O(n)-symmetric Model of two n-Vector Fields in D=4-2 epsilon

Details Critical Behavior of a General O(n)-symmetric Model of two n-Vector Fields in D=4-2 epsilon Critical Behavior of a General O(n)-symmetric Model of two n-Vector Fields in D=4-2 epsilon

2008-09-09

arxiv.org/abs/0809.1568v2

J.Phys.A42:095003,2009

Physics

Condensed Matter

Statistical Mechanics

23 pages

Scientific paper

10.1088/1751-8113/42/9/095003

The critical behaviour of the O(n)-symmetric model with two n-vector fields is studied within the field-theoretical renormalization group approach in a D=4-2 epsilon expansion. Depending on the coupling constants the beta-functions, fixed points and critical exponents are calculated up to the one- and two-loop order, resp. (eta in two- and three-loop order). Continuous lines of fixed points and O(n)*O(2) invariant discrete solutions were found. Apart from already known fixed points two new ones were found. One agrees in one-loop order with a known fixed point, but differs from it in two-loop order.

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