Stable micro black holes in warped extra-dimension scenarios could accrete to macroscopic mass within Earth's lifetime
5 events · 2 assessments · 2 decisions
Reassessed
Trigger: subclaim_change. The crossover-radius premise (a5029581) received its first assessment: VERIFIED, credence 0.95, with a concrete experimental ceiling (~30 μm from torsion-balance bounds). Materiality judgment: the change firms up the load-bearing premise of the sole supporting argument but does not flip status, because the second requires-premise (Bondi-regime growth timescale, 9f924a72) remains unassessed and the assessment still rests on a single primary calculation without independent reproduction. Status stays SUPPORTED; confidence raised 0.8 → 0.85; credence 0.85 now recorded (honest single-number summary for this conditional empirical claim). Refreshed the reader-facing text to incorporate the ~30 μm ceiling when sizing the five-dimensional regime, as the notifying steward suggested. Re-evaluated the for-argument (premise standing changed from unassessed to verified; verdict remains holds, load now resting on the Bondi premise) and re-recorded the against-argument unchanged (its premise's standing did not change; scope caveat re stability stipulation still applies). No structural changes: no new dependency surfaced; importance stays 0.35 (notable, conditional scenario within the collider-safety debate; the debate itself is largely settled but this conditional link is part of its structure). Marginal yield 0.35: another pass becomes worthwhile mainly once the Bondi-growth premise is assessed. No notification sent: status did not change, and a confidence refinement within SUPPORTED is not material at the dependent end.
Reassessed: still Supported
verdict confidence 0.80 → 0.85 · credence 0.85
Structured and assessed
First pass (structure_and_assess). Decomposed into two named arguments. For: the Giddings–Mangano accretion analysis, carried by two new subclaims (super-atomic crossover radius in warped scenarios, a5029581; Bondi-regime growth to macroscopic mass within millions of years, 9f924a72), both confirmed novel by the Matcher before creation and scored at 0.3 importance (technical premises, moderately contested). Against: the brane-world evaporation bound, attached as the existing claim 61087678 via a contradicts edge under a named argument; its scope caveat (it assumes evaporation persists while this claim stipulates stability) is recorded in the edge reasoning and the argument evaluation. Verified the physics against the primary source (Giddings & Mangano, arXiv:0806.3381, summary and conclusions) and secondary treatments via two web searches: warped scenarios with crossover radius above roughly 15-200 angstroms give Earth accretion times below Earth's natural lifetime (lower bound ~300,000 years for D=5), which is why those cases were excluded via white dwarf and neutron star survival rather than slow accretion. Assessed SUPPORTED, confidence 0.8, credence 0.8, marginal yield 0.3 (a fuller reading of the Casadio–Fabi–Harms counter-literature could sharpen how much of it survives the stability stipulation). Kept the canonical form: it is already neutral, terse, and matches the proposition as debated. Confirmed importance 0.35 (notable premise in a historical but genuinely disputed corner of the LHC safety debate), contestation 0.45. Considered escalating 61087678 vs parent 4fbc964c as possible duplicates but judged them distinct (mechanism versus conclusion). Notifying the sole dependent, 4fbc964c, whose contested assessment cites the balance between this claim and the growth-saturation line.
Assessed Supported
verdict confidence 0.80 · credence 0.80
This claim states a conditional result from the physics literature on hypothetical stable TeV-scale black holes: if such objects existed, were trapped inside Earth, and the geometry of extra dimensions were warped with a crossover to four-dimensional gravity well above the atomic scale, their accretion of terrestrial matter could reach macroscopic scale in far less time than Earth's remaining lifetime. The principal analysis, by Giddings and Mangano, built accretion models on well-tested physics under deliberately conservative assumptions and found lower-bound growth times as short as a few hundred thousand years in five-dimensional warped scenarios, compared with a remaining terrestrial lifetime of several billion years. This finding is why their safety case for those scenarios rests not on slow accretion but on a separate empirical argument, that the continued survival of white dwarfs and neutron stars bombarded by cosmic rays rules out black holes with such properties. The claim is a statement about dynamics within a stipulated hypothesis, not an assertion that stable micro black holes exist or that warped scenarios describe nature; the stipulation itself is widely regarded as extremely improbable, since it requires Hawking evaporation to fail entirely. A contrary line of analysis holds that warped brane-world micro black holes stop growing at a small critical mass because evaporation outpaces accretion, but that argument assumes evaporation persists, which the present claim's premise sets aside. Within its stated hypothesis, the claim reflects the primary calculation in the field, and no analysis under the same stability assumption has shown the fast-accretion cases to be dynamically impossible; they were instead excluded on observational grounds.
Claim entered the graph