Why Michelson-Morley Gets a Null Result Classical Luminiferous Aether Rigid elastic medium — fixed lattice points AETHER WIND → → → beam splitter c + v c − v (return) √(c² − v²) ✗ PREDICTS FRINGE SHIFT Light speed depends on direction of travel: Δt = (2L/c) · v²/c² At v = 30 km/s (Earth orbital speed): Δt/t ≈ 10⁻⁸ → detectable shift Observer moves through fixed medium → wind is detectable dc1 Superfluid Substrate Coherent collective motion — no fixed positions no detectable wind — collective flow IS the metric modon (photon) speed set by collective dynamics c c ✓ PREDICTS NULL RESULT Modon speed set by equation of state, not frame: ω² = c²k² (acoustic dispersion) Effective metric is Lorentzian by construction: g_μν = (ρ/c)[−(c²−v²), −vⱼ; −vᵢ, δᵢⱼ] Quasiparticles see acoustic geometry, not rest frame vs.