Effect of residual many-body forces due to evolution in the in-medium similarity renormalization group method
Articolo
Data di Pubblicazione:
2019
Citazione:
Effect of residual many-body forces due to evolution in the in-medium similarity renormalization group method / G. Puddu. - In: JOURNAL OF PHYSICS. G, NUCLEAR AND PARTICLE PHYSICS. - ISSN 0954-3899. - 46:11(2019 Nov).
Abstract:
In the past few years, in-medium similarity renormalization group methods have been introduced and developed. In these methods the Hamiltonian is evolved using a unitary transformation in order to decouple a reference state from the rest of the Hilbert space. Even if we start from a two-body interaction, the evolution by itself will generate many-body forces which are usually neglected. In this work we estimate the effect of these residual many-body forces by comparing results obtained with the hybrid multi-determinant method, which keeps the Hamiltonian within the two-body sector, with the corresponding results obtained with the in-medium similarity renormalization group. Although percentage-wise the effect of neglecting these induced many-body forces is not too large, they can be appreciable depending on the nucleus, the shell model space and the harmonic oscillator frequency.
Tipologia IRIS:
01 - Articolo su periodico
Keywords:
nuclear many-body theory, renormalization group, variational methods
Elenco autori:
G. Puddu
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