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arXiv 2307.05910nucl-th
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量子多体问题的短程展开

Short-range expansion for the quantum many-body problem

Ronen Weiss, Diego Lonardoni, Stefano Gandolfi

AI总结:

本文提出多体波函数的系统性短程展开,经两体系统和无限中子物质验证,可准确描述密度与动量分布,并连接短程关联核反应实验与低能核物理。

摘要:

在这项工作中,我们推导了多体波函数的系统性短程展开。在领头阶,波函数被因子化为一个零能 s 波关联对和旁观粒子,而包含能量导数以及更大轨道角动量两体函数的项则出现在次领头阶。该展开的有效性在两体情形以及以无限中子物质为研究对象的多体情形中均得到了检验。研究对坐标空间两体密度和一体动量分布都获得了准确且一致的描述。这些结果表明,可利用此类展开来描述强相互作用多体系统中的不同可观测量,包括核、原子和凝聚态系统。本工作还使系统描述对短程关联敏感的核系统中大动量转移反应成为可能,在此类实验与低能核物理之间建立了联系,并推动在这些实验中测量新的可观测量。

英文摘要:

In this work we derive a systematic short-range expansion of the many-body wave function. At leading order, the wave function is factorized to a zero-energy $s$-wave correlated pair and spectator particles, while terms that include energy derivatives and larger orbital angular momentum two-body functions appear at subleading orders. The validity of the expansion is tested for the two-body case, as well as the many-body case, where infinite neutron matter is considered. An accurate and consistent description of both coordinate-space two-body densities and the one-body momentum distribution is obtained. These results show the possibility to utilize such an expansion for describing different observables in strongly-interacting many-body systems, including nuclear, atomic and condensed-matter systems. This work also enables a systematic description of large momentum transfer reactions in nuclear systems sensitive to short-range correlations, provides a link between such experiments and low-energy nuclear physics, and motivates measurement of new observables in these experiments.

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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