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
影响因子:
3.1
通讯作者:
Furnstahl, R. J.
中科院分区:
文献类型:
--
作者:
Tropiano, A. J.;Bogner, S. K.;Furnstahl, R. J.
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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DOI:
--
发表时间:
2016
期刊:
影响因子:
--
作者:
C. Johnson
通讯作者:
C. Johnson
影响因子:
64.8
作者:
A. Schmidt;J. Pybus;R. Weiss;E. Segarra;A. Hrnjic;A. Denniston;O. Hen;E. Piasetzky;L. Wein
通讯作者:
A. Schmidt;J. Pybus;R. Weiss;E. Segarra;A. Hrnjic;A. Denniston;O. Hen;E. Piasetzky;L. Wein
DOI:
10.1016/j.cpc.2013.08.007
发表时间:
2013-08
期刊:
Comput. Phys. Commun.
影响因子:
--
作者:
K. Launey;S. Sarbadhicary;T. Dytrych;J. Draayer
通讯作者:
K. Launey;S. Sarbadhicary;T. Dytrych;J. Draayer
DOI:
10.1088/0954-3899/37/6/064005
发表时间:
2010
期刊:
Journal of Physics G
影响因子:
--
作者:
R. Furnstahl;A. Schwenk
通讯作者:
A. Schwenk
DOI:
--
发表时间:
2016
期刊:
影响因子:
--
作者:
E. Arriola;S. Szpigel;V. Timóteo
通讯作者:
V. Timóteo