LISA Pathfinder's measured relative acceleration noise between two free-falling test masses bounds the Diósi–Penrose regularization length to at least 40.1 ± 0.5 fm, a value larger than the size of any nucleus.

ORCH-E046 derives the bound from LISA Pathfinder's published relative acceleration noise between two free-falling test masses, attributing the residual entirely to collapse-induced force noise and obtaining a Diósi–Penrose regularization length of at least 40.1 ± 0.5 fm — larger than any nucleus. The inference chain is short and the input measurement is a flight-qualified published figure. Two qualifications keep it at well supported rather than established: the bound is deliberately conservative, since Brownian thermal noise dominates and is not precisely known, and the calculation applies to the regularized model with a point-mass cutoff, which Penrose's own formulation treats differently. Its importance is the channel rather than the number: mechanical momentum diffusion is not photon emission, so the escape that saves Penrose OR from the radiation nulls does not reach here.

Helou et al. analyzed relative acceleration noise from the free-falling test masses of the LISA Pathfinder mission, bounding the Diósi–Penrose regularization scale to at least 40.1 ± 0.5 fm, exceeding the diameter of atomic nuclei. This provides a direct, non-radiation bound on collapse-induced momentum diffusion. The strongest opposing consideration is that the bound is conservative because it attributes all unexplained residual acceleration noise to wavefunction collapse rather than unaccounted classical thermal dissipation.

The LISA Pathfinder re-derivation is a conservative attribution of all residual acceleration noise to collapse, quoted accurately, and it constrains a channel — mechanical momentum diffusion — that the radiation-based escape route does not reach. The bound is conditional on attributing residual noise to collapse and on the regularized point-mass formulation, which is why it qualifies rather than undermines ORCH-C030 as stated. Solid as a reported bound, moderate because it is a re-derivation rather than a direct measurement.

ORCH-E046 reports the 40.1 ± 0.5 fm lower bound derived from LISA Pathfinder's acceleration-noise measurement and correctly states that this exceeds nuclear dimensions. The bound is conservative because all residual acceleration noise is attributed to collapse. The strongest opposing consideration is its model dependence: it applies to a regularized Diósi–Penrose realization with a specified cutoff, not automatically to Penrose's bare criterion.

Helou et al. attribute LISA Pathfinder residual relative acceleration noise to collapse-induced force noise and bound the DP regularization length to at least ~40.1 fm, larger than any nucleus, ruling out particle-sized cutoffs for that model class. Strongest opposing consideration is that the bound is conservative (thermal noise dominates) and applies to regularized DP with a point-mass cutoff rather than every reading of Penrose’s heuristic.

Held on its source statement alone: no admitted evidence record is attached to this claim, so the grade follows the rule for such claims rather than doubt about the paper. The same LISA Pathfinder bound is weighed where its record is attached, on the collapse-physics claim ORCH-C030. The verdict was well_supported before this rule was applied.