arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1105.0028cond-mat.stat-mechhep-lathep-phnucl-th
收藏

维里展开的一种新的场论方法

A new field theoretic method for the virial expansion

David B. Kaplan, Sichun Sun

摘要:

本文发展了一种计算非相对论性量子场论维里展开系数的图解方法。作为一个例子,我们计算酉费米子,一个非微扰系统的第三维里系数b3。通过计算几个图形并进行外推,我们得到b3 =-0.2930,在最近由刘、胡和德拉蒙德计算的b3 = -0.29095295的0.7%之内,其中涉及对谐波陷阱中的三个幺正费米子求和10,000个能级。

英文摘要:

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 b3 for unitary fermions, a nonperturbative system. By calculating several graphs and performing an extrapolation, we arrive at b3 =-0.2930, within 0.7% of a recent computation b3 = -0.29095295 by Liu, Hu and Drummond, which involved summing 10,000 energy levels for three unitary fermions in a harmonic trap.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑