Quantum superpositions of sufficiently different mass distributions collapse objectively, with a characteristic lifetime τ ≈ ℏ/E_G set by the gravitational self-energy of the mass-distribution difference.

The natural parameter-free stochastic completion is experimentally dead; the heuristic ℏ/E_G criterion the claim states has never been tested and makes no radiation prediction. Unresolved is accurate. The defense is costly in a way worth recording: survival by underspecification.

The Gran Sasso experiment definitively ruled out the natural parameter-free version of the Diósi-Penrose stochastic collapse model. However, Penrose's original heuristic criterion (τ ≈ ℏ/E_G) lacks the specific radiation prediction that was tested, leaving the core claim untested by current empirical bounds. The strongest objection is methodological: escaping experimental falsification by remaining underspecified is not positive evidence for a theory.

Donadi et al. provide a high-quality null result that rules out the natural parameter-free Diósi–Penrose stochastic collapse model, strongly constraining one concrete implementation. Derakhshani et al. explicitly conclude that Orch OR is highly implausible when based on such a “simplest version.” Yet McQueen correctly notes that Penrose’s original proposal is a τ≈ħ/E_G lifetime criterion, not a specified stochastic dynamics, and thus does not strictly entail the spontaneous radiation tested. No experiment has directly measured τ as a function of E_G in mesoscopic superpositions. The strongest objection is methodological: the claim survives empirical pressure largely because it remains underspecified; such vagueness prevents both confirmation and refutation and is not evidentially favorable.

Donadi et al. searched for the spontaneous radiation a stochastic Diósi–Penrose model predicts, found none, tightened the nuclear mass-density cutoff by about three orders of magnitude, and ruled out “the natural parameter-free version of the Diósi–Penrose model.” Derakhshani et al. then judged Orch OR “highly implausible” when based on that simplest version. The claim as worded is Penrose’s characteristic-lifetime relation τ ≈ ℏ/E_G, which McQueen correctly notes is not a stochastic master equation and does not entail the radiation prediction. No experiment has tested ℏ/E_G scaling directly. The strongest opposing consideration is methodological: surviving an experimental bound by being less specified than the model that was killed converts a refuted precise theory into an untested vague one, which is not positive evidence for the remainder.

The Gran Sasso null result genuinely refutes a specific completion — the natural parameter-free stochastic Diósi–Penrose model — with the model's co-originator on the team, and that exclusion is stated in the authors' own words. But Penrose's published criterion is a characteristic-lifetime relation (τ ≈ ℏ/E_G) that makes no radiation prediction, so the claim as worded is unrefuted and untested; no experiment has measured the scaling directly. The strongest opposing consideration is the one the case itself records via McQueen's double-edged point: surviving an experimental bound by being less specified than the model tested converts a refuted precise theory into an untested vague one, which is a worsened epistemic position rather than a vindication.

Not one record measures the asserted scaling. Gran Sasso tested a stochastic Diósi–Penrose completion, found no spontaneous radiation, and excluded the natural parameter-free version in the authors' own words — but Penrose's published criterion is a characteristic-lifetime relation that does not entail the radiation prediction, so the exclusion does not reach the claim as stated. That leaves one natural implementation experimentally dead and the underlying relation untested. The strongest opposing consideration cuts against the theory rather than for it, and McQueen raises it himself: escaping a bound by occupying a less specified version of the theory is not positive evidence for that version, and it converts a refuted precise model into an untested vague one. I considered presently_untestable, since the mesoscopic superposition regime that would measure the relation is beyond current capability, but the experiment is designed and approaching feasibility, so unresolved is the accurate label.

The natural parameter-free stochastic completion is experimentally excluded (ORCH-E017, applied to the theory in ORCH-E018), while the heuristic τ ≈ ℏ/E_G relation makes no radiation prediction and has never been tested (ORCH-E019). Survival by underspecification, recorded as a cost rather than a defence.

The natural parameter-free stochastic completion is experimentally dead (ORCH-E017); the heuristic ℏ/E_G criterion as stated makes no radiation prediction and has never been tested (ORCH-E019). Survival by underspecification, which is worth recording as a cost.

The natural parameter-free stochastic completion is experimentally excluded (ORCH-E017), while the bare ℏ/E_G lifetime relation makes no radiation prediction and has never been tested (ORCH-E019). Survival by underspecification, which is recorded as a cost rather than a credit.

Penrose's proposal that quantum superpositions objectively collapse with a lifetime related to gravitational self-energy remains an unconfirmed theoretical construct. While the natural parameter-free stochastic Diósi-Penrose model was experimentally excluded by the Gran Sasso radiation search, Penrose's original heuristic criterion is a characteristic-lifetime relation that avoids this radiation prediction. Escaping a bound via underspecification leaves the hypothesis alive but completely untested.

Donadi et al. provide a strong null result that rules out the parameter-free Diósi–Penrose stochastic model, so one natural implementation of gravity-related collapse is experimentally dead. However, Penrose’s own published proposal is a lifetime scaling relation τ ≈ ℏ/E_G rather than a specified stochastic dynamics, and McQueen’s critique that it does not by itself predict spontaneous radiation is correct. No experiment in the file directly measures ℏ/E_G scaling in mesoscopic superpositions. The main opposing consideration is that surviving by remaining underspecified is not evidentially virtuous: each completed model in this class that gets ruled out incrementally erodes the plausibility of the underlying heuristic.

Donadi et al. 2021 ruled out, in the authors' own words, the natural parameter-free version of the Diósi–Penrose model by finding none of the spontaneous radiation a stochastic completion predicts, and Derakhshani et al. then judged Orch OR "highly implausible" when based on that simplest version. Penrose's published criterion is a characteristic-lifetime relation rather than that master equation and makes no radiation prediction, so the claim as worded has not been tested. The strongest opposing consideration is methodological rather than experimental: escaping a bound by being less specified than the model that was tested converts a refuted precise theory into an untested vague one, which is not positive evidence for the vague one.

The Gran Sasso experiment excluded the natural parameter-free stochastic Diósi–Penrose model — a genuine refutation of a specific completion — but Penrose's published criterion is a characteristic-lifetime relation (τ ≈ ℏ/E_G) that makes no radiation prediction, so the claim as worded survives untested; no experiment has measured the scaling directly. The strongest opposing consideration is the one this case rightly accepts as double-edged: escaping an experimental bound by being less specified than the model tested is not positive evidence, and it converts a refuted precise theory into an untested vague one. Meanwhile the class of gravity-related collapse models specified enough to test is being narrowed by experiment, and no positive evidence for ℏ/E_G scaling exists anywhere in the record.

The ℏ/E_G lifetime relation has never been tested directly; what has been tested is a stochastic completion of it, and that completion's natural parameter-free version is excluded by the Gran Sasso null. McQueen's model-theoretic point that Penrose's criterion entails no radiation prediction is sound and blocks the inference from refuted-completion to refuted-criterion, so "contradicted" would overreach. The strongest opposing consideration is the one McQueen himself concedes and the case records: surviving an experimental bound by being less specified than the model tested is not positive evidence, and the class of gravity-related collapse models specified enough to test keeps narrowing. Positive evidence for this claim is, on this ledger, exactly zero.

The natural parameter-free stochastic completion is experimentally excluded (ORCH-E017), while the bare τ ≈ ℏ/E_G lifetime relation makes no radiation prediction and remains untested (ORCH-E019). Survival by underspecification is recorded as a cost, not a credit.

The natural parameter-free stochastic completion is experimentally excluded (ORCH-E017), while the bare τ ≈ ℏ/E_G lifetime relation makes no radiation prediction and remains untested (ORCH-E019). Survival by underspecification is recorded as a cost, not a credit.

The claim that superpositions collapse via gravitational self-energy remains a theoretical foundation without direct affirmative measurement. The strongest opposing consideration is the Gran Sasso experiment (ORCH-E017), which found no spontaneous radiation and excluded the natural parameter-free version of the Diósi-Penrose model, though McQueen (ORCH-E019) argues this bound does not test the specific lifetime scaling criteria Penrose proposed.

Donadi et al. (ORCH-C031/E017) and Derakhshani et al. (E018) robustly exclude the “natural parameter-free” Diósi–Penrose stochastic collapse model over a large parameter range, significantly constraining one plausible implementation of gravity-related objective reduction. However, Penrose’s original τ≈ħ/E_G criterion is a heuristic lifetime relation, not a specified stochastic master equation, and McQueen (E019) is correct that it does not by itself entail the tested radiation signal. No experiment in the docket directly measures collapse lifetime as a function of gravitational self-energy in a mesoscopic system, so the core scaling relation remains untested. The strongest opposing consideration is that surviving primarily by being underspecified relative to the models that have been refuted is not strong epistemic support and suggests the viable theory space is shrinking.

Gran Sasso searched for spontaneous radiation predicted by a stochastic Diósi–Penrose master equation, found none, tightened the nuclear mass-density cutoff by about three orders of magnitude, and in the authors' words ruled out the natural parameter-free version of that model; the same group then judged Orch OR highly implausible when based on that completion. Penrose's published criterion is a characteristic-lifetime relation τ ≈ ℏ/E_G that does not entail the radiation prediction, and no experiment in the file tests ℏ/E_G scaling directly, so the claim as worded is untested rather than refuted. Strongest opposing consideration: escaping an experimental bound by remaining less specified than the model that was tested is not positive evidence, and the class of gravity-related collapse models specified enough to test is being narrowed.

The Gran Sasso null result (ORCH-E017) is a genuine experimental refutation of the natural parameter-free stochastic Diósi–Penrose completion, stated in the authors' own words. But Penrose's published criterion is a characteristic-lifetime relation that makes no radiation prediction (ORCH-E019), and no experiment has tested the ℏ/E_G scaling directly, so the claim as worded is unrefuted and unconfirmed. The strongest opposing consideration is methodological and cuts against crediting the survival: the theory escapes the bound by being less specified than the model that was tested, which converts a refuted precise theory into an untested vague one — a worse epistemic position, though not evidence of falsehood. Specified completions of gravity-related collapse are meanwhile being narrowed by experiment.

No experiment has tested the ℏ/E_G lifetime scaling itself, so there is no positive evidence for the claim as worded; the one high-quality experiment (ORCH-E017) excluded a stochastic completion that Penrose's heuristic criterion does not entail, a point conceded even by the experimenters' own conditional phrasing (ORCH-E018) and pressed by McQueen (ORCH-E019). The strongest opposing consideration is methodological and self-inflicted: the claim survives the best available test by being less specified than the model tested, converting a refuted precise theory into an untested vague one, which is not a position from which to claim vindication. On the current file this is genuinely open and, importantly, open on a track with no biology in it.

The natural parameter-free stochastic completion is experimentally excluded (ORCH-E017), while the bare τ ≈ ℏ/E_G lifetime relation makes no radiation prediction and remains untested (ORCH-E019). Survival by underspecification is recorded as a cost, not a credit.

The natural parameter-free stochastic completion is experimentally excluded (ORCH-E017), while the bare τ ≈ ℏ/E_G lifetime relation makes no radiation prediction and remains untested (ORCH-E019). Survival by underspecification is recorded as a cost, not a credit.

The specific parameter-free Diósi-Penrose stochastic completion is decisively excluded by the Gran Sasso spontaneous radiation bounds. The strongest opposing consideration is that Penrose's original heuristic timescale criterion makes no spontaneous radiation prediction, leaving the core concept unrefuted but fundamentally untested.

Penrose’s τ≈ħ/E_G criterion has not been directly tested; the Gran Sasso experiment (ORCH-C031) decisively rules out the natural parameter-free Diósi–Penrose stochastic model but does not reach Penrose’s own heuristic relation, which makes no radiation prediction. Thus the specific collapse law asserted here is neither observed nor experimentally excluded. The strongest opposing consideration is that the only fully specified gravity-related collapse model of this family has now been refuted, and surviving by being vaguer than the tested model is a weak epistemic position, especially in the absence of any positive scaling data.

Donadi et al. 2021 rule out the natural parameter-free stochastic Diósi–Penrose model; Derakhshani et al. 2022 apply that bound to Orch OR as "highly implausible" when based on the simplest gravity-related dynamical collapse. Penrose's published criterion is a characteristic lifetime τ ≈ ℏ/E_G rather than a stochastic master equation, and McQueen correctly notes that it makes no radiation prediction, so the claim as worded is untested rather than refuted. No record tests ℏ/E_G scaling directly. The strongest opposing consideration is methodological: escaping an experimental bound by being less specified than the model that was killed is not positive evidence; it converts a refuted precise theory into an untested vague one.

The Gran Sasso experiment excluded the natural parameter-free stochastic Diósi–Penrose model (ORCH-E017), and the experimenters themselves judged Orch OR built on that completion "highly implausible" (ORCH-E018) — but Penrose's published criterion is a characteristic-lifetime relation, not a stochastic master equation, and makes no radiation prediction (ORCH-E019), so the claim as worded was not what was tested. No experiment has measured whether collapse lifetime scales as ℏ/E_G. The strongest opposing consideration is methodological and cuts hard: surviving an experimental bound by being less specified than the model that was tested converts a refuted precise theory into an untested vague one, and the class of specified, testable gravity-collapse models is being steadily narrowed. That makes the claim's position weak, but weak-and-untested is what unresolved records here.

No experiment in the ledger tests the ℏ/E_G lifetime scaling itself; the Gran Sasso null (ORCH-E017) excludes a stochastic completion that, as McQueen correctly notes (ORCH-E019), Penrose's characteristic-lifetime criterion does not entail. So the claim as worded is neither confirmed nor refuted — it is untested, and R007 records that the required mesoscopic regime is beyond current capability, which puts this close to the presently_untestable boundary. The strongest opposing consideration is methodological and I accept it: surviving an experimental bound by being less specified than the model that was tested is not evidence for the surviving version, and the class of gravity-collapse models specified enough to test keeps narrowing.

The natural parameter-free stochastic completion is experimentally excluded (ORCH-E017, ORCH-E018), while the bare τ ≈ ℏ/E_G lifetime relation makes no radiation prediction and remains untested (ORCH-E019). Survival by underspecification is recorded as a cost, not a credit.

The natural parameter-free stochastic completion is experimentally excluded (ORCH-E017), while the bare τ ≈ ℏ/E_G lifetime relation makes no radiation prediction and remains untested (ORCH-E019). Survival by underspecification is recorded as a cost, not a credit.

Evidence-only, and this is a case where precision about what was tested matters more than the headline. The Gran Sasso experiment (ORCH-C031) searched for the spontaneous radiation that a stochastic Diósi–Penrose collapse model predicts from charged particles, found none, tightened the bound on the effective nuclear mass-density size by about three orders of magnitude, and — in the paper's own words — "rules out the natural parameter-free version of the Diósi–Penrose model." That is a genuine experimental refutation of a specific completion. It is not a refutation of the claim as worded here, because Penrose's published criterion is a characteristic-lifetime relation rather than a stochastic master equation and does not entail the radiation prediction the experiment looked for. No experiment has yet tested the ℏ/E_G scaling directly. So: one natural implementation experimentally dead, the underlying claim unconfirmed and untested.

The lifetime relation itself has never been measured. What has been tested is a stochastic completion of it, twice and independently: ORCH-E017 at Gran Sasso and ORCH-E070/ORCH-E049 in the Majorana Demonstrator, both null, both excluding the natural parameter-free version. ORCH-E046 adds a second channel — LISA Pathfinder's acceleration noise bounds the regularization length above any nuclear size — which matters because the published escape (ORCH-E019, that Penrose's criterion predicts no radiation) does not reach mechanical momentum diffusion. ORCH-E051 narrows the escape further: a semiclassical construction reproduces the rate exactly and fixes its prefactor, so the question is now which dynamics rather than whether any. It survives as unresolved rather than contradicted only on ORCH-E071 and ORCH-E052, in which the co-originator states that the rate carries an unspecified constant, that its parameter-freedom may be illusory because it diverges for point masses, and that he and Penrose disagree about how the collapse happens at all.

Penrose's heuristic criterion τ ≈ ℏ/E_G lacks a fully developed, generally accepted dynamical collapse equation that conserves energy and momentum. While concrete stochastic formulations like the parameter-free Diósi–Penrose model have been empirically ruled out, the general gravitational collapse principle remains mathematically viable and untested on mesoscopic superpositions. The strongest opposing consideration is that multiple underground experiments and space-borne test masses have ruled out the most natural parameter-free realizations and bounded mechanical force noise.

Two independent underground experiments exclude the natural parameter-free Diósi–Penrose completion and LISA Pathfinder bounds the cutoff above any nuclear size through a radiation-independent channel, while Diósi's own reflective article records that the rate conjecture and its dynamics are separable and that no agreed dynamics exists. The ℏ/E_G scaling itself has never been measured (ORCH-R007 remains out of reach). McQueen's point that Penrose's heuristic criterion predicts no radiation is sound, which blocks refutation, but an escape that converts a refuted model into an untested vague one is not support.

The parameter-free stochastic Diósi–Penrose realization is strongly constrained or excluded by the underground nulls, and LISA Pathfinder limits a regularized mechanical-noise realization. Those tests do not directly measure the bare τ ≈ ℏ/E_G lifetime relation, whose complete dynamics remain disputed and incompletely specified. The strongest opposing consideration is that at least one semiclassical construction reportedly reproduces the conjectured rate exactly, but the ledger does not establish whether that construction survives the existing bounds.

Parameter-free stochastic Diósi–Penrose is excluded by underground radiation searches and constrained by LISA Pathfinder acceleration noise, but the claim as worded is the characteristic-lifetime relation τ ≈ ℏ/E_G, which those channels do not directly measure and which McQueen argues need not entail the searched-for radiation. Strongest opposing consideration is that every concrete dynamical completion so far proposed is under severe experimental pressure, so underspecification may be sheltering an already failing idea.

ORCH-E017, with ORCH-E070 as context, excludes the parameter-free stochastic version. ORCH-E018 applies that result to Orch OR only conditionally. ORCH-E046 bounds the regularization length above any nuclear size through mechanical noise, which the no-radiation escape in ORCH-E019 does not reach. ORCH-E071 records the rate's constant as unspecified. The lifetime relation itself has never been tested directly, so it is not contradicted.