BMV: the experiment that splits the field in two.
Two microspheres in superposition, adjacent, falling. If gravity can entangle them, classical-channel gravity is dead. The numbers are within an order of magnitude of current platforms — and after Folio VII's amendment, the Ledger sits on the quantum side of this divide with a clean conscience: in flat space its prediction coincides with perturbative quantum gravity, derived in its own exact machinery, not assumed.
The Ledger · Invoice Nº 002 · Amended Pricing
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After
The Audit
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The horizon fee is real and hopelessly small.
The amended fee bills at horizons, at the DSW rate Γ ∝ q²d²a³/ℏc⁵. The house prints the magnitudes rather than gesturing at "future experiments":
| Platform | a (m/s²) | d | Γ (per second) | one nat in |
|---|---|---|---|---|
| Ultracentrifuge (10⁶ g) | 10⁷ | 1 nm | 3×10⁻⁴² | 10²⁶ × age of universe |
| Same, d = 1 µm | 10⁷ | 1 µm | 3×10⁻³⁶ | 10²⁰ × age of universe |
| Laser-plasma extreme (10¹¹ g) | 10¹² | 1 µm | 3×10⁻²¹ | 10⁵ × age of universe |
No foreseeable laboratory collects this fee. The honest consequence: the Ledger's distinctive horizon physics is astrophysical and cosmological, not benchtop. A theory that pretended otherwise would be selling something. The benchtop lines that remain are below — and they are different in kind.
Where the theory can still die in public.
The drag bound: is the vacuum a lattice? PROGRAM DEFINED
Folio VII's addendum measured it in the toy: a discrete vacuum bills uniform motion (Cherenkov, no threshold — phase velocity below c at every nonzero wavenumber), while a Lorentz-invariant vacuum bills only acceleration. Every precision null on anomalous drag is therefore a bound on vacuum discreteness: pulsar braking indices that match electromagnetic models, matter-wave interferometers that hold coherence over seconds at hundreds of µm/s, the absence of velocity-dependent dephasing anywhere. The calculation owed: map the toy's drag rate (∝ coupling² × resonant-mode density at v) onto a gravitationally-coupled granular vacuum with cell scale ℓ, and convert existing nulls into an exclusion curve for ℓ. The Ledger does not predict the drag — it predicts that if spacetime's books are kept on a lattice, the drag is there, and the data may already rule on it.
The reserve's equation of state: is Λ exactly constant? SHARPEST OPEN EDGE
Folio VI read Λ as the locked reserve; Folios VIII–IX added that records crossing the cosmological horizon are permanent deposits into it. A reserve that accumulates is not exactly constant: the picture leans toward an equation of state that can drift as the horizon processes history. Survey cosmology is measuring exactly this — and current data (DESI-era) already strains w = −1. The owed calculation: does the escrow picture predict the sign and rough scale of dw/dz? If it predicts drift and Λ proves exactly constant — or the reverse — this is the one place the Ledger's cosmological reading can be killed by data already being taken. This is Folio XI's assignment.
The quench fee: the one decoherence the Ledger does price in flat space. MEASURED IN THE TOY
The amendment leaves one flat-space charge standing: sudden transactions pay bremsstrahlung (measured: D = 0.00425 for the quench vs zero adiabatic, Folio VII). Translated to the lab: fast switching of massive superpositions should show a switching-rate-dependent dephasing floor that slow ramps do not — gravitational in origin, suppressed by (Gm²) and therefore tiny, but scaling distinctively with ramp time rather than with environment. Order-of-magnitude for BMV-class masses it is far below thermal floors; filed as a matter of principle, with the scaling stated so that any anomalous ramp-rate dephasing in future platforms can be checked against it.
The honest position.
- What the lab decides soon: BMV — and a positive result vindicates the quantum side the Ledger shares with perturbative QG. The Ledger contributed its own exact-machinery derivation of that side (Folio VII), which is participation, not distinction.
- The horizon fee is not benchtop physics — 10⁻²¹/s at the most violent accelerations money can buy. Printed, not hidden.
- The drag bound and the w(z) question are where distinctive falsifiability now lives — both are owed calculations, not yet exclusion curves. Until they exist, the Ledger's near-term experimental identity is honest but thin.
- The diamond temperature at lab scale (14.6 mK at L = 10 cm) remains real and remains gravitationally coupled — i.e., invisible to any current probe. It earns its keep in the theory, not in the cryostat.