Falsifiable, quantitative, and testable with current technology
Part III: The Theory
"It doesn't matter how beautiful your theory is. If it disagrees with experiment, it's wrong."
— Richard Feynman
Most interpretations of quantum mechanics — Copenhagen, Many-Worlds, Pilot Wave — are empirically equivalent. They all predict the same outcomes. A century of argument with no way to settle it experimentally.
ACT isn't just an interpretation — it's a physical theory. It adds a real mechanism (anchoring) to quantum field theory. That mechanism makes specific, quantitative predictions that differ from standard QM, from CSL/GRW, and from every other interpretation.
ACT isn't starting from zero. Its framework already explains all observed decoherence phenomena.
| Phenomenon | ACT Prediction | Status |
|---|---|---|
| Progressive decoherence | Exponential decay: ρ(t) ∝ e⁻ᴦᵗ | ✓ |
| Mass dependence | Heavier → faster (Γ ∝ m²) | ✓ * |
| Temperature scaling | Γ increases with T | ✓ |
| Pressure dependence | Γ ∝ ρ_gas | ✓ |
| Observable-specific rates | Γ_position > Γ_momentum | ✓ |
| Zero-T persistence | Vacuum fluctuations maintain decoherence | ✓ |
| Isotope mass effect | 15–20% for ¹²C vs ¹³C | → Proposed |
Seven for seven on existing data. And the data is already suggestive.
Existing data doesn't just validate ACT — it already hints at something beyond standard decoherence.
As matter-wave interferometry has pushed to larger molecules — C₆₀ (720 amu) through proteins to 25 kDa — a consistent pattern has emerged: measured decoherence rates systematically exceed predictions from known environmental sources (Schlosshauer 2019).
ACT explains this naturally: massive molecules have high intrinsic anchoring rates (Γ ∝ m²) even in perfect vacuum, from Yukawa coupling to the Higgs bath. The "excess" decoherence is intrinsic Higgs-mediated anchoring.
Isotopes hold every environmental coupling exactly constant (same electrons, same chemistry, same cross-sections) while varying only nuclear mass. Any difference in coherence time must be intrinsic.
"The data already whispers. The isotope test will shout."
Isotope mass dependence in quantum coherence times.
Higgs coupling gives particles mass: y_f = m_f / v
Anchoring rate depends on coupling squared: Γ ∝ y² = (m/v)²
Therefore anchoring rate scales as mass-squared: Γ ∝ m²
Isotopes have identical chemistry but different mass
Any difference in coherence time must come from a mass-dependent mechanism
What does each framework predict for τ(¹²C) / τ(¹³C)?
| Theory | Mechanism | Prediction | Effect |
|---|---|---|---|
| Standard QM + decoherence | Chemistry determines coupling; isotopes identical | 1.000 | 0% |
| Diósi-Penrose (gravitational) | Gravitational self-energy | ~1.04 | ~4% |
| CSL / GRW (mass-linear) | Γ ∝ m; C-13 is 8.3% heavier | ~1.08 | ~8% |
| ACT (mass-squared) | Yukawa coupling: Γ ∝ m² | 1.174 | 17.4% |
A single experiment can discriminate between all four predictions.
Vienna LUMI 2.0 matter-wave interferometer — all required technology exists.
For C₆₀ fullerenes: M(¹²C₆₀) = 720 amu | M(¹³C₆₀) = 780 amu | Predicted ratio ≈ 1.175 (17.5%)
All required technologies exist. No new inventions needed.
Isotopically pure C₆₀ synthesis, beam optimization, systematic characterization. Collaboration with Vienna and MIT groups.
Initial ¹²C₆₀ vs ¹³C₆₀ coherence time comparison at Vienna LUMI. Parallel potassium isotope runs at MIT.
Temperature variation (4K, 77K, 300K). Environmental density studies. Multi-isotope cross-checks.
Larger molecules, higher masses. Precision m² vs m scaling tests. Full discrimination between ACT, CSL, Diósi-Penrose.
"Within five years, we'll know if anchoring is real."
ACT is falsifiable. Every outcome teaches us something.
Standard QM confirmed. No mass-dependent decoherence beyond environmental effects. ACT falsified. The measurement problem remains open, but we've ruled out an entire class of theories.
CSL/GRW confirmed. Mass-linear collapse is real. Revolutionary for physics. ACT's specific m² scaling is falsified, but the general idea that mass drives collapse is vindicated.
ACT confirmed. Mass-squared coupling via Higgs mechanism. The measurement problem is solved. Standard QM falsified. CSL falsified. The quantum-to-classical transition is a physical phase transition.
All seven milestones achieved.
ACT is a fully specified, falsifiable physical theory.
ACT explains — and predicts.
Next: Lecture 11 — Ontology Recapitulates Mathematics