Soliton Core Oscillation of Ultralight Scalar Dark Matter in the Unary Field Theory

This preprint details the derivation and observational strategy for the soliton core oscillation of ultralight scalar dark matter in the Unary Field Theory (UFT). Key predictions include: Oscillation Period: Tosc∼1.1×108years. Quantum Nature: The entire kiloparsec-scale dark matter soliton (Rsol=1.46kpc) behaves as a coherent macroscopic quantum oscillator. Amplitude: Fractional density variation δρ0/ρ0∼10−4. Observational Strategy: The primary probe is the precision astrometry of the S2 star orbit around Sagittarius A* (Sgr A*) using the GRAVITY instrument. We predict a secular drift in the orbital elements due to the oscillating gravitational potential of the Galactic soliton core. Future observations with the Extremely Large Telescope (ELT) are expected to reach the sensitivity required for detection. Significance: This work provides a parameter-free, robust prediction that can be tested within the next few decades, offering a direct path to confirming the quantum nature of galactic dark matter. Reference: Zou, Z. (2026). The Unary Field Theory: κt Flow, Locked Kinetic Mass, and the Origin of Spacetime Dynamics. Zenodo. https://doi.org/10.5281/zenodo.21186809