A black hole accreting hazardously fast on Earth would accrete faster inside white dwarfs or neutron stars.
5 events · 2 assessments · 2 decisions
Reassessed
Triggered by subclaim_change: the Eddington-limit subclaim (b19391af-254c-4d9d-86e4-d183a0e4f438, relation contradicts) received its first assessment, CONTRADICTED at confidence 0.9. My prior SUPPORTED verdict (0.8, credence 0.88) had explicitly named that subclaim as the main open uncertainty and said its flipping to supported would force re-examination. It resolved the other way, confirming the existing verdict. Reassessed: status unchanged at SUPPORTED, confidence raised to 0.85 and credence to 0.92, reasoning updated to cite the objection's premise as contradicted (trapped/advected radiation in optically thick degenerate interiors; Giddings & Mangano 2008, East & Lehner 2019, Richards, Baumgarte & Shapiro 2021) rather than as an answered but unassessed dissent. Re-evaluated the Eddington-limit objection argument (still fails, now on a contradicted rather than unassessed premise) and re-confirmed the density-scaling argument (holds_with_caveats). No structural change: decomposition already captures the debate; no new dependency surfaced. Importance stays at 0.35 (notable supporting premise inside the collider black-hole safety debate; the surrounding dispute is effectively settled in the literature). No web search needed: the change is confirmatory and the cited literature was already weighed. Not notifying dependents: the status did not change and the confidence movement is modest and confirmatory, so no dependent's assessment could plausibly turn on it (§22).
Reassessed: still Supported
verdict confidence 0.80 → 0.85 · credence 0.92
Structured and assessed first pass
First pass on the density-scaling bridge of the Giddings-Mangano LHC safety argument. Decomposition: created one novel low-importance requires stub for the compact-star density contrast (Matcher confirmed novelty 0.95; scored 0.1, deferred as settled bedrock per §19), and linked two existing claims rather than minting duplicates: the Eddington-luminosity cap claim (b19391af, contradicts, grouped under the against-argument, per Plaga arXiv:0808.1415) and the GM inconsistency-rebuttal claim (b2f080ee, supports, ungrouped, per arXiv:0808.4087; Matcher match 0.95). Two named arguments with written forms and evaluations: the density-scaling argument (holds with caveats, since the Bondi sound-speed offset means the conclusion rests on GM's explicit calculation, not raw density) and the Eddington-limit objection (fails as it stands, its premise unassessed and its scenario found inconsistent by GM and by Casadio-Fabi-Harms 2009). Web search (3 queries, policy V/SH) confirmed the primary sources and the shape of the Plaga exchange. Assessed SUPPORTED, confidence 0.8, credence 0.88: peer-reviewed supporting calculation, lone dissent answered with no independent endorsement, dormant since 2009; short of verified because model-dependent and because this pass did not re-derive GM's appendix numbers (marginal_yield 0.25). Canonical form kept: 16 words, neutral, frame-independent. Importance confirmed at 0.35 (notable supporting premise; contestation 0.25, real but dormant dispute). Note: if the Eddington-cap subclaim b19391af is later assessed supported in the form Plaga's objection needs, this claim requires re-examination.
Assessed Supported
verdict confidence 0.80 · credence 0.88
This claim is the bridging step in the astrophysical safety argument of Giddings and Mangano (Physical Review D 78, 035009, 2008) concerning hypothetical stable TeV-scale black holes: if such an object could accrete fast enough to endanger Earth, the same object embedded in a white dwarf or neutron star, whose interiors are denser than terrestrial rock by six to fourteen orders of magnitude, would consume its host far sooner. Since old white dwarfs and neutron stars are observed to survive, hazardous terrestrial accretion rates are then excluded. The step rests on a detailed calculation, not a bare density comparison: Giddings and Mangano worked through the microscopic-capture and hydrodynamic accretion regimes, including the partially offsetting effect of the much higher sound speeds in degenerate matter, and found that in every scenario where terrestrial accretion is fast enough to be dangerous, accretion inside a compact star is faster still. The one articulated objection came from Rainer Plaga, who argued that accretion inside dense stars would saturate at the Eddington luminosity, a cap set by the black hole's mass rather than by the density of its surroundings, so that compact-star accretion need not outpace a hazardous terrestrial rate. Giddings and Mangano replied that this scenario applies Hawking-radiation and accretion formulas from incompatible regimes, and the originators of the quantum black-hole model Plaga adopted, Casadio, Fabi and Harms, independently concluded in peer-reviewed work that such black holes stop growing far below any dangerous mass. No independent analysis has supported the objection, and the exchange has been dormant since about 2009. The claim stands as well supported: its supporting calculation is peer-reviewed and mainstream, its lone counter has been answered and has attracted no independent endorsement, though the conclusion remains conditional on model-dependent physics of hypothetical objects rather than on anything observable directly.
Claim entered the graph