Fast & accurate emulation of two-body scattering observables without wave functions

Fast & accurate emulation of two-body scattering observables without wave functions
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DOI:
10.1016/j.physletb.2021.136608
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发表时间:
2021
期刊:
影响因子:
4.4
通讯作者:
Zhang, Xilin
Zhang, Xilin
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Melendez, J.A.;Drischler, C.;Garcia, A.J.;Furnstahl, R.J.;Zhang, Xilin

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We combine Newton's variational method with ideas from eigenvector continuation to construct a fast & accurate emulator for two-body scattering observables. The emulator will facilitate the application of rigorous statistical methods for interactions that depend smoothly on a set of free parameters. Our approach begins with a trialKorTmatrix constructed from a small number of exact solutions to the Lippmann–Schwinger equation. Subsequent emulation only requires operations on small matrices. We provide several applications to short-range potentials with and without the Coulomb interaction and partial-wave coupling. It is shown that the emulator can accurately extrapolate far from the support of the training data. When used to emulate the neutron-proton cross section with a modern chiral interaction as a function of 26 free parameters, it reproduces the exact calculation with negligible error and provides an over 300x improvement in CPU time.
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