Renormalization group, dimer-dimer scattering, and three-body forces

被引：13
|
作者：
Krippa, Boris [1 ,2 ]
Walet, Niels R. [2 ]
Birse, Michael C. [2 ]
机构：
[1] Inst Theoret & Expt Phys, Moscow 117259, Russia
[2] Univ Manchester, Sch Phys & Astron, Manchester M13 9PL, Lancs, England
来源：
PHYSICAL REVIEW A | 2010年 / 81卷 / 04期
关键词：
BOSE-EINSTEIN CONDENSATION; FIELD THEORY;
D O I：
10.1103/PhysRevA.81.043628
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
We study the ratio between the fermion-fermion scattering length and the dimer-dimer scattering length for systems of nonrelativistic fermions, using the same functional renormalization technique as previously applied to fermionic matter. We find a strong dependence on the cutoff function used in the renormalization flow for a two-body truncation of the action. Adding a simple three-body term substantially reduces this dependence.
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页数：4
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