TeV-scale black holes produced at the LHC pose no significant risk.
25 events · 11 assessments · 13 decisions
No action needed
Trigger: subclaim_change on the cosmic-ray energy premise (2bff4ef7), first assessment VERIFIED at credence 0.99. Checked the premise's assessment and this claim's current assessment. The current assessment (recorded 2026-07-19, supported / confidence 0.9 / credence 0.98) already integrates exactly this change: it cites the verification, the ~10^17 eV break-even conversion, and the several-hundred-TeV center-of-mass comparison, and concludes the verification confirms rather than shifts the safety case's structure. All five argument evaluations are current, including the terrestrial cosmic-ray precedent whose energy premise this is (evaluated holds_with_caveats, with the neutral-hole capture gap explicitly noted as closed by the compact-star bound). The change is confirmatory of a premise the verdict already relied on; it is not material to status, confidence, or credence, and no structural adjustment is needed. No re-assessment recorded to avoid duplicating an identical assessment in the history; no dependent notification, since this claim's assessment did not change. This trigger appears to be a re-delivery of a change absorbed on the prior pass.
Reassessed no status change
Trigger: subclaim_change. The subclaim "Cosmic ray collisions with Earth's atmosphere reach energies exceeding LHC collision energies" received its first assessment: VERIFIED (confidence 0.93, credence 0.99). Materiality judgment: confirmatory, not disruptive. The prior assessment had already treated this premise as textbook-level and not in live dispute; formal verification strengthens the terrestrial cosmic-ray precedent's energy leg without shifting the holistic balance. No structural change needed; no missing dependency discovered; no web search warranted since the underlying physics literature has not moved. Assessment refreshed: SUPPORTED, confidence 0.9, credence 0.98, marginal_yield 0.1 (the two remaining unassessed subclaims, billions of years of bombardment without catastrophe and observed survival of old compact stars, are uncontested observational bedrock that cannot plausibly move the verdict). The refresh also split the previous single-blob reasoning into a proper reader-facing assessment plus reasoning trace with inline subclaim links. Backfilled evaluations for all five named arguments, which previously had none: Hawking evaporation (holds, lives on the Hawking-radiation presupposition), Terrestrial cosmic-ray precedent (holds_with_caveats, neutral-hole escape gap), Compact-star survival bound (holds, load-bearing on the neutral-hole stopping step), Residual-risk critiques (holds as an inference but both physical premises contradicted, only the contested methodological premise survives), Planck-size accretion fallback (holds_with_caveats, scope limited to genuinely Planck-sized holes). No notification to dependent stewards: status, confidence, and credence are unchanged, so the change cannot be material downstream; the triggering change itself was explicitly flagged as confirming dependents' premises. Importance left at 0.7: historically consequential and publicly salient safety question with a live methodological residue, though the physics is now largely settled.
Reassessed: still Supported
verdict confidence 0.90 · credence 0.98
Reassessed
Trigger: subclaim_change. The presupposition "Black holes emit Hawking radiation" received its first assessment (supported, credence 0.9). The prior verdict on this claim had already relied on that presupposition while noting it was formally unassessed, and the new assessment lands where the verdict assumed it would, so the change is absorbed without a status shift. Refreshed the assessment texts so the record no longer describes the presupposition as unassessed and so the layered structure of the safety case (Hawking evaporation, Planck-size accretion fallback, compact-star survival bound) is stated cleanly for readers. Status, confidence (0.9), and credence (0.98) unchanged. No structural changes: the decomposition already carries the relevant dependency and both sides of the residual-risk critique. Canonical form is already a short neutral statement of the disputed proposition; left as is. Importance remains 0.7 as set: the claim was consequential and publicly contested around 2008, though the live debate has largely subsided. Not notifying dependent stewards: the assessment status and credence did not change, so no dependent could be materially affected.
Reassessed: still Supported
verdict confidence 0.90 · credence 0.98
Reassessed
Triggered by subclaim change: the compact-star stopping subclaim (6f35d59a) was broadened from charged-only to the general charged-or-neutral proposition and received its first assessment (SUPPORTED 0.8, credence 0.85). My prior assessment had relied on exactly this broad reading while it was formally unrecorded, so the change validates an assumption rather than shifting the balance of evidence. Structural review: no changes made. The trigger suggested considering placement of "Stable neutral black holes produced by cosmic rays would pass through Earth without being gravitationally captured" (7eaaf861) in the parent's argument structure; on inspection it is already attached as a CONTRADICTS subclaim under the "Terrestrial cosmic-ray precedent" argument, whose written form already casts it as the reason that precedent is incomplete and the bound must run through compact stars. No missing load-bearing dependency was found; all five arguments have current written forms referencing their subclaims. Outcome: status unchanged at SUPPORTED, confidence 0.9, credence 0.98. The compact-star survival bound now has all three material legs formally assessed SUPPORTED (production 0.8, stopping 0.8, accretion constraint 0.85), deepening the robustness of the verdict. VERIFIED remains out of reach (Hawking radiation unobserved, stopping leg SUPPORTED not VERIFIED with a genuinely contested neutral-hole crux, methodological critique CONTESTED). Importance left at 0.7 — historically prominent and consulted, though the physics dispute is largely settled. Because status, confidence, and credence are all unchanged, no notification to dependent stewards was sent; the change is confirmatory and not material downstream.
Reassessed: still Supported
verdict confidence 0.90 · credence 0.98
Reassessed no structural change
Curator trigger suggested attaching claim ef5c7a47-48ec-4d7d-ad9b-ecf3e43928db ("A microscopic black hole on the order of the Planck length cannot accrete ordinary matter at a meaningful rate", VERIFIED 0.9) as a supporting subclaim. On inspection the edge already exists under the argument "Planck-size accretion fallback" (6c91bea1), whose written form already includes the Curator's scope caveat (covers only genuinely Planck-sized holes; the metastable/TeV-gravity dispute is addressed by the compact-star survival bound). Adding the edge again would duplicate it, so no structural change was made. Because the prior assessment predated this attachment and did not weigh the fallback argument, I re-assessed: the VERIFIED fallback premise is confirmatory defense-in-depth, closing the "evaporation fails AND hole is genuinely Planck-sized" branch, but it does not touch the live dispute branch, so status remains SUPPORTED at confidence 0.9, credence 0.98. Status and numbers unchanged from prior assessment, so no notification to dependent stewards is warranted. Importance remains 0.7 (historically consequential and publicly contested safety claim, though the physics discourse has largely settled).
Reassessed: still Supported
verdict confidence 0.90 · credence 0.98
Reassessed
Re-triggered by first assessment of the production-leg subclaim of the Giddings-Mangano compact-star argument (87e34806): SUPPORTED (0.8, credence 0.9), with its canonical form made explicitly conditional. Checked the conditional rewording against this claim's compact-star argument written form: it fits without change, since the parent's risk scenario only arises when TeV-scale production is possible, which is the conditional's antecedent. No structural edits made; no new load-bearing dependencies discovered. The change is confirmatory: the prior SUPPORTED verdict already leaned on this leg, and its caveats (neutron-star magnetic screening, heavier UHECR composition) are internal to the published analysis and do not weaken the white-dwarf channel that carries the quantitative bound. Reassessed SUPPORTED with confidence nudged 0.89 -> 0.90 and credence unchanged at 0.98. Status unchanged, so no notification to dependent stewards is warranted. Importance left at 0.7: historically consequential and publicly salient safety question, but the physics discourse is largely settled, so effort was kept to a moderate pass with no external search needed.
Reassessed: still Supported
verdict confidence 0.89 → 0.90 · credence 0.98
Reassessed
Re-triggered by first assessment of the subclaim "A metastable black hole accreting matter at the Eddington limit would emit hazardous Hawking radiation" (now CONTRADICTED, 0.75/0.05). The change is confirmatory: the prior assessment had already discounted this subclaim as moot given the CONTRADICTED metastable-loophole subclaim it depends on. With both prongs of the Plaga hazard mechanism now formally CONTRADICTED, the against-argument reduces to the CONTESTED methodological critique, which contests standards of proof, not physics. Status stays SUPPORTED; confidence nudged 0.88 → 0.89. No structural changes: the decomposition already represents every live line of reasoning, and no new load-bearing dependency emerged. No web search performed — the change resolves in the direction the prior verdict anticipated, and existing evidence (rebuttal papers, ATLAS/CMS null searches, years of incident-free operation) already covers the question. Not notifying dependent stewards: status and credence are unchanged, so the change is immaterial to dependents.
Reassessed: still Supported
verdict confidence 0.88 → 0.89 · credence 0.98
No action needed
Triggered by subclaim change: first assessment of "Microscopic black holes evaporate almost instantaneously via Hawking radiation" (SUPPORTED, credence 0.9). The claim's current assessment (SUPPORTED, 0.88, recorded 2026-07-17T21:28) already incorporates exactly this change — its reasoning trace opens with this trigger, weighs the subclaim's new status as confirmatory of the existing verdict, and notes that the presupposed claim "Black holes emit Hawking radiation" is already attached (PRESUPPOSES, within the Hawking-evaporation argument) and remains unassessed, which is one reason VERIFIED stays out of reach. I re-verified: that presupposed claim is still unassessed, the metastable-loophole critique remains CONTRADICTED, the methodological critique remains CONTESTED, and no new instances or subclaim changes have arrived since the assessment was recorded. This invocation is therefore a duplicate/re-fired notification of an already-absorbed change. No re-assessment, no structural change, and no dependent notification needed (the claim's assessment did not change). Importance 0.7 remains appropriate: historically prominent, publicly consequential safety claim, though the live scientific contestation has largely settled.
Reassessed
Triggered by the first assessment of the Hawking-evaporation subclaim (SUPPORTED, credence 0.9). Judged the change confirmatory rather than disruptive: the prior verdict already treated the evaporation line as strong-but-theoretical and rested primarily on the independent Giddings-Mangano compact-star bound, which is exactly the shape the new subclaim assessment confirms. Status kept at SUPPORTED with a modest confidence increase (0.87 to 0.88); credence unchanged at 0.98. No structural changes: the newly noted dependency on "Black holes emit Hawking radiation" is already attached to this claim as a PRESUPPOSES subclaim in the same argument, and the Plaga 2008 dissent is already represented in the residual-risk argument (metastable-loophole subclaim, CONTRADICTED). No web search performed, as the trigger introduced no new external evidence and the discourse on this claim is stable; effort scaled to a confirmatory subclaim change on a 0.7-importance claim. Status unchanged, so dependent stewards were not notified.
Reassessed: still Supported
verdict confidence 0.87 → 0.88 · credence 0.98
Reassessed
Triggered by first assessment of subclaim d200fefa-f453-41c4-9af1-eb5b62bab50a (stellar-survival accretion bound): SUPPORTED (0.85, credence 0.92). Judged the change confirmatory rather than material: the prior SUPPORTED verdict on this claim already relied on the Giddings-Mangano compact-star argument, whose core causal subclaim this is, and the against-argument's state is unchanged (methodological critique CONTESTED, metastable loophole CONTRADICTED). Retained SUPPORTED with confidence raised 0.85 -> 0.87 to reflect that a previously unassessed load-bearing subclaim settled in the expected direction; credence unchanged at 0.98. No structural changes: decomposition remains accurate, all four arguments have written forms, no missing load-bearing dependency discovered. No external search performed since no plausible finding would flip the verdict given the trigger's confirmatory nature. Status unchanged, so no notification to dependent stewards. Importance left at 0.7: historically consequential and publicly contested safety question, though the live physics debate has largely settled.
Reassessed: still Supported
verdict confidence 0.85 → 0.87 · credence 0.98
Reassessed
Trigger: subclaim "Published LHC black hole risk analyses do not establish that catastrophic risk is negligible" received its first assessment, CONTESTED (0.7). Materiality review: the prior SUPPORTED assessment had already priced this subclaim in as a credible methodological caveat blocking VERIFIED; its CONTESTED verdict, explicitly grounded in a definitional dispute over standards of proof with the Plaga physics leg defeated, matches that prior treatment and introduces no new physics against the claim. The affirmative case (Hawking evaporation, cosmic-ray precedent, Giddings-Mangano compact-star bound with its only physics objection CONTRADICTED, plus null LHC search results and incident-free operation) is unchanged. Re-recorded SUPPORTED at confidence 0.85, credence 0.98, with the reasoning trace updated to reflect the subclaim's settled status. No structural changes needed; no web search warranted since the change was internal bookkeeping of an already-weighed critique. No notification to dependents: status, confidence, and credence are unchanged, so the change is not material downstream.
Reassessed: still Supported
verdict confidence 0.85 · credence 0.98
Reassessed
Triggered by first assessment of the subclaim "Astrophysical bounds from stellar survival do not exclude metastable collider-produced black holes" as CONTRADICTED (0.7 confidence, 0.15 credence). That subclaim was the physics-substantive leg of the against-argument (residual-risk critiques), attached via CONTRADICTS. Its refutation (a) removes the only objection engaging the compact-star bound on its own terms, and (b) undercuts the dependent Eddington-accretion hazard subclaim, which is conditional on the metastable scenario. The change is confirmatory of the existing verdict: status stays SUPPORTED, verdict confidence raised 0.8 -> 0.85, credence unchanged at 0.98. VERIFIED remains blocked by the still-credible Ord/Hillerbrand/Sandberg methodological critique and the unobserved status of Hawking radiation; CONTESTED is now even further from warranted. No structural changes: the refuted objection stays in the decomposition as part of the mapped discourse, and no new load-bearing dependency was discovered. No external search performed; the prior assessment's external checks (ATLAS/CMS null searches, operational record) remain current and the subclaim change only strengthens the same conclusion. Status did not change, so no notification to dependent stewards was sent; the confidence adjustment is not material to downstream claims.
Reassessed: still Supported
verdict confidence 0.80 → 0.85 · credence 0.98
Decomposed and assessed
Triggered by Curator suggestion to attach claim 87e34806 (cosmic-ray production of TeV black holes on white dwarfs/neutron stars) as a supporting subclaim. Adopted the suggestion and, since the claim had no structure at all despite hosting the prominent 2008 LHC safety debate, gave it its first full decomposition as four named arguments: (1) Hawking evaporation (existing claims 9b424908 supports, 1d0fda33 presupposes, since critics dispute Hawking radiation's reality); (2) Terrestrial cosmic-ray precedent (existing 2bff4ef7, e33b324a; plus new claim 7eaaf861 "stable neutral black holes would pass through Earth uncaptured", the acknowledged gap in that precedent, created after match_claim confirmed novelty, importance 0.35); (3) Compact-star survival bound, the Giddings-Mangano argument the Curator pointed to (87e34806 per suggestion; 6f35d59a capture claim, identified by the Matcher; d200fefa accretion constraint; plus new uncontested bedrock claim e6375f19 "old white dwarfs and neutron stars survive billions of years", importance 0.1, left as embedded stub); (4) Residual-risk critiques, against (a96f71a7, 85ae89b1, 27bd8b54). All four arguments given written forms. Assessed SUPPORTED (confidence 0.8, credence 0.98): peer-reviewed primary source plus astrophysical observation plus fifteen years of LHC operation strongly favor the claim; VERIFIED was rejected because credible peer-reviewed methodological critiques (Ord/Hillerbrand/Sandberg, Kent) exist; CONTESTED was rejected as false parity since the denying side offers no credible affirmative evidence of danger. Kept the seeded importance 0.7: consequence-if-wrong is existential and the page is historically heavily consulted, though live contestation is now modest. Escalated to Curator a possible canonical-form narrowness in the capture claim 6f35d59a ("charged" qualifier may not fit the neutral-black-hole role the argument needs).
Assessed Supported
verdict confidence 0.80 · credence 0.98
The question dates from the run-up to the Large Hadron Collider's start-up in 2008, when critics argued that its collisions might create microscopic black holes that could grow inside Earth. Mainstream physics offers three lines of defence. First, in the speculative theories that permit TeV-scale black holes at all, such objects should evaporate almost instantly through Hawking radiation; this argument presupposes Hawking radiation, which has never been directly observed, a point the critics pressed. Second, cosmic rays have struck Earth's atmosphere at energies beyond the LHC's for billions of years without catastrophe, though this precedent leaves a gap: a hypothetical stable neutral black hole made by a cosmic ray would be moving too fast for Earth to capture, while a collider-made one could be slow enough to be retained. The analysis by Giddings and Mangano (Physical Review D, 2008) closes that gap. The same cosmic rays striking white dwarfs and neutron stars would produce the same objects and trap them inside those dense bodies, so the observed survival of old white dwarfs and neutron stars over billions of years bounds how fast any such black hole could accrete, and the bound applied to Earth yields timescales far longer than the Sun's lifetime. On this basis they concluded there is no risk of any significance, a conclusion endorsed by CERN's LHC Safety Assessment Group. The credible dissent does not claim that danger exists. Analysts of low-probability, high-stakes risk (Ord, Hillerbrand and Sandberg; Kent) argue that the probability of an error somewhere in a safety argument can exceed the tiny risk the argument purports to bound, and that scenarios such as metastable black holes with intermediate lifetimes are less fully covered by the astrophysical constraints. These are critiques of how much certainty the published analyses can deliver, not evidence of hazard. Since 2010 the LHC has operated at collision energies up to 13.6 TeV; searches by the ATLAS and CMS experiments have found no evidence that microscopic black holes are produced at all, and no harmful effects have occurred. The claim rests on peer-reviewed theory, astrophysical observation, and fifteen years of operating experience, and is about as well established as a claim of negligible risk can be; what would strengthen it further is a direct observation constraining Hawking radiation, or simply the continued accumulation of collider running without anomaly.
Claim entered the graph