Stable microscopic black holes produced by cosmic rays striking white dwarfs or neutron stars would be stopped inside those stars, whether charged or neutral.
Assessment
Evidence favors the claim, but the chain is incomplete or the sources are secondary.
This claim is the capture leg of the astrophysical safety argument concerning hypothetical stable TeV-scale black holes: if ultra-high-energy cosmic rays striking white dwarfs or neutron stars can produce such black holes, the stars' survival only constrains the scenario if the black holes are actually stopped and retained inside them.
The charged case rests on ordinary electromagnetic energy loss, which at white-dwarf and neutron-star densities is enormous; no informed party disputes it, and an independent 2016 re-analysis (Sokolov and collaborators) confirms stopping across the full energy range. The neutral case is the substantive one: with no electromagnetic coupling, stopping relies on gravitational scattering and accretion over the star's column depth. The primary calculation (Giddings and Mangano, 2008, peer-reviewed) finds that a solar-mass white dwarf stops neutral black holes up to about 14 TeV in five and six spacetime dimensions, while seven dimensions require white dwarfs above roughly 1.1 solar masses, which are observed; neutron-star stopping follows a fortiori from nuclear density. The 2016 re-analysis independently reproduces the neutral-case capture result.
The published critiques of the broader safety argument target other links in the chain, not this one. Plaga's metastable-black-hole scenario concerns the rate of accretion and energy release after capture, and such objects are stable on the timescales relevant to stopping, so they fall within this claim rather than against it. The concern that neutron-star magnetic fields screen incident cosmic rays bears on whether black holes are produced at the star at full energy, not on whether a produced black hole stops. No source disputing the stopping calculation itself has been found.
The result remains theoretical: the stopping cross sections depend on the assumed number of extra dimensions and on TeV-scale gravity modeling, and no observational test of the stopping process is possible. It therefore stands as a well-supported, independently reproduced calculation about hypothetical objects rather than an established fact.
Full reasoning — evidence and decisions behind this verdict
The claim traces to Giddings & Mangano 2008 (arXiv:0806.3381, Phys. Rev. D), whose sole recorded instance affirms it: charged black holes and black holes in the relevant configurations "would be stopped inside white dwarfs and neutron stars regardless" of production velocity. No denying instances exist.
The two required legs weigh as follows. The charged-case subclaim ("charged microscopic black holes are stopped in dense stellar matter by electromagnetic energy loss") is uncontested textbook physics: electromagnetic dE/dx at compact-star densities guarantees stopping, and Sokolov et al. (arXiv:1611.04949) independently confirm charged black holes stop in a white dwarf over the whole energy range. The neutral-case subclaim ("gravitational and accretional energy loss stops neutral TeV-scale black holes inside white dwarfs") is the crux: the primary source computes stopping via gravitational scattering and accretion over the stellar column depth, finding efficient stopping up to 14 TeV for D=5 and 6 with a solar-mass white dwarf, and for D=7 with white dwarfs above ~1.1 solar masses, which are observed. The CERN safety review characterized this as a conservative, accretion-only estimate, and the 2016 re-analysis independently redoes the neutral-case capture calculation and reaches the same stopping conclusion.
Known critiques were checked and found to attach elsewhere. Plaga (arXiv:0808.1415) disputes accretion and energy-release rates for metastable black holes after capture, not the stopping calculation; because a metastable black hole is effectively stable on capture timescales, his scenario is inside the scope of this claim as worded ("stable"), and his critique does not contradict it. The neutron-star magnetic-screening concern (raised in Johnson's legal-risk analysis and related commentary) is about whether incident cosmic rays reach neutron-star surfaces at full energy, i.e. the production leg of the parent survival-bound argument; it does not bear on whether a black hole, once produced there, stops. No source disputing stopping itself has been found.
Why SUPPORTED rather than VERIFIED: the result is a peer-reviewed primary calculation with an independent reproduction, but it concerns hypothetical objects, the cross sections depend on the assumed number of extra dimensions, the D=7 case carries a real (if satisfiable) white-dwarf-mass condition, and no observational verification is possible. Credence 0.85 is conditional: given stable TeV-scale black holes produced on a compact star, the charged-case physics is robust and the neutral case well-argued though model-dependent. What would change the conclusion: a technical analysis showing the gravitational/accretional stopping-power calculation overestimates energy loss (e.g. corrected D-dimensional capture cross sections), or a demonstration that the required white-dwarf masses for higher D are not realized in the relevant cosmic-ray-exposed populations.
The related claim that stable neutral black holes would pass through Earth uncaptured is affirmed by the same source and is consistent with this one; the difference is the vastly higher column density of compact stars. It is context for the parent argument, not evidence against this claim.
Decomposition
The claims this one rests on directly. ↗︎ opens a subclaim; the map shows how they fit together.
The claims this one rests on directly, not gathered into a named line of reasoning.
- requiresa load-bearing premise: the parent is false without itsteward instructions →Charged microscopic black holes are stopped in dense stellar matter by electromagnetic energy loss. ↗︎
- requiresa load-bearing premise: the parent is false without itsteward instructions →Gravitational and accretional energy loss stops neutral TeV-scale black holes inside white dwarfs. ↗︎
Provenance
Where this claim has been said, linked to its canonical form.
charged black holes and black holes produced in certain configurations would be stopped inside white dwarfs and neutron stars regardless
Addressing the objection that cosmic-ray black holes, unlike LHC ones, are produced at high velocity and might not be captured.
Assessment history
0 status changes over 2 assessments. full history →
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Created by extractor · Jul 17, 2026. Every judgment on this page is accompanied by a reasoning trace.