Lattice Medium Mechanism of Migdal Effect and Unified Interpretation of Dark Matter Essence Within the Real-Virtual Dual Field Theory Framework

The experimental results published in Nature in 2026 by the team from the University of Chinese Academy of Sciences first directly observed the Migdal effect in neutron-nucleus collisions. It confirmed that nuclear recoil can transfer energy to extranuclear electrons through intra-atomic field coupling and cause ionization, providing key experimental support for light dark matter detection. Existing quantum mechanics theories can only phenomenologically describe the transition probability of this effect, and have not yet given the underlying medium dynamic mechanism. Meanwhile, dark matter is still presupposed as an independent unknown elementary particle, lacking a unified ontological explanation. Based on the globally self-similar closed macroscopic lattice framework of the Real-Virtual Dual Field Theory (RVDT), and starting from the three core axioms of the monism of the origin field, this paper establishes a lattice nested dynamic model at the atomic scale: the atomic nucleus is a high-density lattice node of the real field, and extranuclear electrons are secondary lattice-bound vortices, both of which complete energy transfer through the continuous virtual field lattice medium. This paper derives the global conduction equation of nuclear recoil lattice deformation from first principles, gives the ionization threshold condition and cross-section scaling relation of the Migdal effect, and the theoretically calculated relative cross-section is quantitatively consistent with the experimental measured values. Meanwhile, it reconstructs the essential definition of dark matter, pointing out that dark matter is not an independent new particle, but a low-density diffuse lattice aggregate of the global virtual field. The Migdal effect is essentially a cross-level energy amplification effect of weakly coupled lattice disturbance. Based on lattice dynamics, four sets of quantitative testable predictions are proposed to provide new theoretical guidance for subsequent dark matter detection and atomic physics experiments.