Operator evolution from the similarity renormalization group and the Magnus expansion

Operator evolution from the similarity renormalization group and the Magnus expansion
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相似重正化群和马格努斯展开的算子演化

DOI:
10.1103/physrevc.102.034005
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发表时间:
2020
期刊:
影响因子:
3.1
通讯作者:
Furnstahl, R. J.
Furnstahl, R. J.
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Tropiano, A. J.;Bogner, S. K.;Furnstahl, R. J.

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马格努斯展开是一种有效的替代解决相似重整化群(SRG)流方程与高阶,内存密集型常微分方程求解器。它提供的数值简化运营商的演变是特别有价值的介质SRG计算,虽然挑战仍然是困难的问题,涉及入侵者状态。在这里,我们测试的马格努斯方法在一个类似的,但更方便的情况下,这是自由空间SRG治疗的虚假的束缚态所产生的领先阶手征有效场理论(EFT)的潜力非常高的截止。我们表明,马格努斯扩张通过这些测试,然后使用的调查作为跳板,以解决运营商的演变,在核过程的规模和计划的依赖性的背景下,有新的相关性的各个方面。这些方面包括SRG算子流与带与块对角生成器,手征EFT哈密顿算子和相关算子与不同的正则化方案的普遍性,以及因尺度分离而产生的因子分解的影响。短程相关物理和调和高,低分辨率的核结构和反应的治疗的可能性的影响进行了讨论。
The Magnus expansion is an efficient alternative to solving similarity renormalization group (SRG) flow equations with high-order, memory-intensive ordinary differential equation solvers. The numerical simplifications it offers for operator evolution are particularly valuable for in-medium SRG calculations, though challenges remain for difficult problems involving intruder states. Here we test the Magnus approach in an analogous but more accessible situation, which is the free-space SRG treatment of the spurious bound states arising from a leading-order chiral effective field theory (EFT) potential with very high cutoffs. We show that the Magnus expansion passes these tests and then use the investigations as a springboard to address various aspects of operator evolution that have renewed relevance in the context of the scale and scheme dependence of nuclear processes. These aspects include SRG operator flow with band- versus block-diagonal generators, universality for chiral EFT Hamiltonians and associated operators with different regularization schemes, and the impact of factorization arising from scale separation. Implications for short-range correlations physics and the possibilities for reconciling high- and low-resolution treatments of nuclear structure and reactions are discussed.
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