Nontopological finite temperature induced fermion number

被引:14
作者
Aitchison, IJR
Dunne, GV
机构
[1] Univ Oxford, Dept Phys, Oxford OX1 3NP, England
[2] Univ Adelaide, Res Ctr Subat Struct Matter, Adelaide, SA 5005, Australia
关键词
D O I
10.1103/PhysRevLett.86.1690
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
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 T induced fermion number is temperature dependent but topological.
引用
收藏
页码:1690 / 1693
页数:4
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