New Field-Theoretic Method for the Virial Expansion

被引：48

作者：

Kaplan, David B. ^{[1
]}

Sun, Sichun ^{[1
]}

机构：

[1] Univ Washington, Inst Nucl Theory, Seattle, WA 98195 USA

来源：

PHYSICAL REVIEW LETTERS | 2011年 / 107卷 / 03期

关键词：

QUANTUM-THEORY;

D O I：

10.1103/PhysRevLett.107.030601

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We develop a graphical method for computing the virial expansion coefficients for a nonrelativistic quantum field theory. As an example we compute the third virial coefficient b(3) for unitary fermions, a nonperturbative system. By calculating several graphs and performing an extrapolation, we arrive at b(3) = -0.2930, within 0.7% of a recent computation b(3) = -0.290 952 95 by Liu, Hu, and Drummond, which involved summing 10 000 energy levels for three unitary fermions in a harmonic trap.

引用

页数：4

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