arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 1008.4130nucl-thcond-mat.quant-gas
收藏

平均场与密度泛函理论的有效三体相互作用

Effective 3-Body Interaction for Mean-Field and Density-Functional Theory

Alexandros Gezerlis, G. F. Bertsch

摘要:

原子核的密度泛函通常包括一个有效的三体相互作用,它依赖于密度的分数幂。利用低密度两组分费米气体的多体理论的见解,我们考虑了一个新的,非局部的,形式的能量泛函,是一致的Fock空间表示的相互作用运营商。特别是,有一个独特的空间非局部概括的接触形式的相互作用,保持密度的三分之七的依赖性所需的多体理论。我们使用非局域诱导三体相互作用计算了谐波阱中粒子的基态能量,并将其与数值精确的格林函数蒙特卡罗计算进行了比较。使用没有自由参数,我们发现,在空间域中的非局部性提供了一个更好的描述弱耦合制度比局域密度近似。

英文摘要:

Density functionals for nuclei usually include an effective 3-body interaction that depends on a fractional power of the density. Using insights from the many-body theory of the low-density two-component Fermi gas, we consider a new, nonlocal, form for the energy functional that is consistent with the Fock space representation of interaction operators. In particular, there is a unique spatially nonlocal generalization of the contact form of the interaction that preserves the density-to-the-seven-thirds dependence required by the many-body theory. We calculate the ground state energies for particles in a harmonic trap using the nonlocal induced 3-body interaction, and compare them to numerically accurate Green's Function Monte Carlo calculations. Using no free parameters, we find that a nonlocality in the space domain provides a better description of the weak-coupling regime than the local-density approximation.

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。

↑