Unmasking Hidden Wigner's Symmetry from First Principles

Abstract

We present quantitative evidence that high-quality internucleon forces derived from $\chi$EFT exhibit a striking dominance of Wigner's supermultiplet symmetry, without invoking the large-$N_c$ limit of QCD or assumptions about specific nuclei. We trace the manifestation of this symmetry in nuclear structure using the ab initio Symmetry Adapted Model (SAM) and identify suppressed spin-isospin polarizability. Our calculations show that a majority of ${}^4\mathrm{He}$, ${}^6\mathrm{Li}$, and ${}^6\mathrm{He}$ wave functions is concentrated in a few $\mathrm{U}(4)$ irreducible representations, without imposing any a priori constraints on the model space. This emergent feature points to a strategy for reducing explosive many-body bases of the NCSM while retaining physically important configurations needed to compute observables.