In-medium similarity renormalization group for a pairing-plus-particle-hole model

L. H. Chen; Y. G. Yao; B. C. He

doi:10.1103/2d2w-2j5t

In-medium similarity renormalization group for a pairing-plus-particle-hole model

L. H. Chen

Y. G. Yao

B. C. He ^*

School of Physics and Astronomy, Sun Yat-sen University, Zhuhai 519082, People's Republic of China

Okemos High School, Okemos, Michigan 48864, USA

Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA

^*Contact author: bhe9@utk.edu

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Phys. Rev. C 113, 014302 – Published 5 January, 2026

DOI: https://doi.org/10.1103/2d2w-2j5t

Abstract

We benchmark two implementations of the in-medium similarity renormalization group (IMSRG) method, IMSRG(2) and IMSRG(2*), for the low-lying states of a pairing-plus-particle-hole model with varying numbers of fermions. In IMSRG(2), all operators are truncated up to the normal-ordered two-body terms, whereas IMSRG(2*) includes an additional term to partially account for higher-body contributions. The results are compared against exact solutions. We find that IMSRG(2*) consistently outperforms IMSRG(2) for both ground and excited states, although achieving convergence for excited states remains more challenging in strongly correlated systems than for the ground state.

Physical Review C

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In-medium similarity renormalization group for a pairing-plus-particle-hole model

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In-medium similarity renormalization group for a pairing-plus-particle-hole model

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