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arXiv 2102.05966cond-mat.quant-gashep-phnucl-th
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四阶稀费米系统的有效场论

Effective field theory for dilute Fermi systems at fourth order

C. Wellenhofer, C. Drischler, A. Schwenk

摘要:

本文讨论了低能费米子微扰有效场论的高阶计算。在截断正则化和维数正则化下,计算了稀费米气体基态能量的四阶费米动量或$k_{\rm F} a_s$展开式.对于自旋二分之一费米子的情况下,我们发现从贝叶斯分析的扩展是很好地收敛在这个顺序为${| k_{\rm F} a_s | \lesssim 0.5}$。此外,我们还证明了Pad{é}-Borel迭代可以改善${| k_{\rm F} a_s | \lesssim 1}$的收敛性.我们的结果为超冷原子和稀中子物质的非微扰计算提供了重要的约束条件。

英文摘要:

We discuss high-order calculations in perturbative effective field theory for fermions at low energy scales. The Fermi-momentum or $k_{\rm F} a_s$ expansion for the ground-state energy of the dilute Fermi gas is calculated to fourth order, both in cutoff regularization and in dimensional regularization. For the case of spin one-half fermions we find from a Bayesian analysis that the expansion is well-converged at this order for ${| k_{\rm F} a_s | \lesssim 0.5}$. Further, we show that Pad{é}-Borel resummations can improve the convergence for ${| k_{\rm F} a_s | \lesssim 1}$. Our results provide important constraints for nonperturbative calculations of ultracold atoms and dilute neutron matter.

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。

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