Evolved Chiral NN+3N Hamiltonians for Ab Initio Nuclear Structure Calculations

Abstract

We discuss the building blocks for a consistent inclusion of chiral three-nucleon (3N) interactions into ab initio nuclear structure calculations beyond the lower p-shell. We highlight important technical developments, such as the similarity renormalization group (SRG) evolution in the 3N sector, a JT-coupled storage scheme for 3N matrix elements with efficient on-the-fly decoupling, and the importance truncated no-core shell model with 3N interactions. Together, these developments make converged ab initio calculations with explicit 3N interactions possible also beyond the lower p-shell. We analyze in detail the impact of various truncations of the SRG-evolved Hamiltonian, in particular the truncation of the harmonic-oscillator model space used for solving the SRG flow equations and the omission of the induced beyond-3N contributions of the evolved Hamiltonian. Both truncations lead to sizable effects in the upper p-shell and beyond and we present options to remedy these truncation effects. The analysis of the different truncations is a first step towards a systematic uncertainty quantification of all stages of the calculation.

21 pages, 16 figures, 2 tables

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• Momentum space evolution of chiral three-nucleon forces
• The Unitary Correlation Operator Method from a Similarity Renormalization Group Perspective
• Neutron matter based on consistently evolved chiral three-nucleon interactions
• ${}^{12}$C properties with evolved chiral three-nucleon interactions

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