The interstellar object 1I/'Oumuamua exhibited a significant non-gravitational acceleration ($$a \approx 5\times10^{-6}\ \mathrm{m/s^2}$$) near perihelion without any detectable outgassing, dust coma, or gas tails, challenging conventional cometary physics. This study applies the Real-Virtual Dual-Field Theory (RVDT), introducing a conjugate golden attenuation factor $$\xi = 0.083\ \mathrm{AU^{-1}}$$. We propose that 'Oumuamua's anomalous acceleration results from its asymmetric coupling with the Sun's local virtual-field gradient, manifesting as a form of field-induced viscous drag. Unlike photon pressure or cometary jets, this mechanism requires no mass loss and naturally explains the absence of cometary activity. The predicted acceleration scales as $$r^{-2}$$, consistent with observational data. RVDT provides a unified framework for 'Oumuamua, "dark comets," and outer solar system orbital residuals including the late-2026 orbital drift prediction of C/2026 C1.