Nontopological Finite Temperature Induced Fermion Number

Details Nontopological Finite Temperature Induced Fermion Number Nontopological Finite Temperature Induced Fermion Number

2000-06-29

arxiv.org/abs/hep-th/0006229v2

Phys.Rev.Lett. 86 (2001) 1690-1693

Physics

High Energy Physics

High Energy Physics - Theory

7 pp, 2 figs; refs + comments added; to appear in PRL

Scientific paper

10.1103/PhysRevLett.86.1690

We show that while the zero temperature induced fermion number in a chiral sigma model background depends only on the asymptotic values of the chiral field, at finite temperature the induced fermion number depends also on the detailed shape of the chiral background. We resum the leading low temperature terms to all orders in the derivative expansion, producing a simple result that can be interpreted physically as the different effect of the chiral background on virtual pairs of the Dirac sea and on the real particles of the thermal plasma. By contrast, for a kink background, not of sigma model form, the finite temperature induced fermion number is temperature dependent but topological.

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