Minimal-Cost Experimental Test of EVRT Signatures in a Tabletop Resonator

This work presents a minimal-cost experimental protocol for testing potential deviations from conventional electromagnetic response in coherent, nonequilibrium resonator systems, as suggested by Emergent Vacuum Response Theory (EVRT). The approach uses a moderate-Q tabletop resonator and time-resolved ringdown measurements to probe for small, bounded variations in decay dynamics, phase response, and linewidth behavior. The experimental design emphasizes reproducibility, control conditions, and falsifiability, with explicit procedures to distinguish candidate signals from conventional electromagnetic, thermal, and instrumental effects. Sensitivity limits are discussed in terms of achievable fractional deviations and timing resolution under typical laboratory conditions. The objective of this work is not to claim new physics, but to establish an accessible and testable framework capable of constraining or identifying EVRT-like response signatures. Null results provide meaningful bounds on possible nonequilibrium electromagnetic effects, while any reproducible deviations would motivate further investigation using higher-precision systems.