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arXiv 2202.03530nucl-thhep-lathep-ph
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可微规划下少核子系统的体积无介子有效场论

Finite-Volume Pionless Effective Field Theory for Few-Nucleon Systems with Differentiable Programming

Xiangkai Sun, William Detmold, Di Luo, Phiala E. Shanahan

摘要:

格点体积无π介子有效场论提供了一个有效的框架,可以将格点量子色动力学中有限体积下计算的原子核谱和矩阵元外推到无限体积和更大原子序数的原子核。在这项工作中,它演示了如何通过一组相关的高斯波函数使用微分编程优化,并通过解决广义本征值问题,可以实现这个框架。这种方法被证明是显着更有效的比随机实施的变分方法的基础上相同形式的相关高斯波函数,产生的基态波函数的一个数量级更少的条款的精确表示。表示效率允许这样的计算扩展到更大的系统比以前的工作。通过计算原子序数为$A\in\{2,3,4\}$的原子核在有限体积中的结合能,与夸克质量为$m_π=806$ MeV的格点量子色动力学计算相匹配,以及基于这种匹配的$A\in\{2,3,4,5,6\}$系统的无限体积有效场论计算,证明了该方法的有效性.

英文摘要:

Finite-volume pionless effective field theory provides an efficient framework for the extrapolation of nuclear spectra and matrix elements calculated at finite volume in lattice QCD to infinite volume, and to nuclei with larger atomic number. In this work, it is demonstrated how this framework may be implemented via a set of correlated Gaussian wavefunctions optimised using differentiable programming and via solution of a generalised eigenvalue problem. This approach is shown to be significantly more efficient than a stochastic implementation of the variational method based on the same form of correlated Gaussian wavefunctions, yielding comparably accurate representations of the ground-state wavefunctions with an order of magnitude fewer terms. The efficiency of representation allows such calculations to be extended to larger systems than in previous work. The method is demonstrated through calculations of the binding energies of nuclei with atomic number $A\in\{2,3,4\}$ in finite volume, matched to lattice QCD calculations at quark masses corresponding to $m_π=806$ MeV, and infinite-volume effective field theory calculations of $A\in\{2,3,4,5,6\}$ systems based on this matching.

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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