Ab initio calculations for dark matter detection and CEvNS

Over the past decades, ab initio nuclear calculation has made dramatic progress, especially reaching the heavy mass region as ²⁰⁸Pb [1]. This means that it becomes possible to obtain first-principles computation (with quantified uncertainties) of quantities which even reside in the heavy-mass region. The quantities include these relevant to astrophysics and searches for physics beyond the Standard Model. In this talk, I will present a conceptual introduction to modern ab initio theory. Then, I will focus on recent advances in ab initio calculations of nuclear responses for dark matter (DM) direct detection [2] and coherent elastic neutrino-nucleus scattering (CEvNS), including nuclei ¹⁹F, ²³Na, ²⁷Al, ^28-30Si, ^70,72-74,76Ge, ¹²⁷I, ¹³³Cs, and ^{128-132,134,136}Xe.

[1]. Ab initio predictions link the neutron skin of ²⁰⁸Pb to nuclear forces. B.S. Hu, W.G. Jiang, T. Miyagi, Z.H, Sun, et al. Nat. Phys. 118, 1196 (2022) arXiv:2112.01125v1.

[2]. Ab initio structure factors for spin-dependent dark matter direct detection. B.S. Hu, et al. Phys. Rev. Lett. 128, 072502 (2022). arXiv:2109.00193.