Bag-model calculations allow strange quark matter to be stable for plausible parameter values
Assessment
Evidence favors the claim, but the chain is incomplete or the sources are secondary.
Within the MIT bag model, the calculation of Farhi and Jaffe (1984) exhibits a window of parameter values, spanning the bag constant, the strange quark mass, and the strong coupling, in which bulk three-flavor quark matter has lower energy per baryon than iron and is therefore absolutely stable. The window's parameters overlap the ranges used in bag-model fits to hadron properties, and its lower boundary is set by the requirement that stable strange matter remain consistent with the observed stability of ordinary nuclei. This model-internal result is not disputed: even authors who reject strange-matter stability on other grounds state that bag-model calculations support it.
The qualification concerns how plausible the required parameter values remain. Recent reappraisals hold that much of the original stability window is now excluded by hadron phenomenology and heavy-ion collision analyses, leaving a narrower region of small bag constants. The claim should also be read as a statement about the bag model, not about nature: models that account for dynamical chiral symmetry breaking, such as Nambu–Jona-Lasinio treatments, find no comparable stability window, which is why the underlying question of whether strange quark matter is actually stable remains open.
Full reasoning: the evidence and decisions behind this verdict
The claim is a statement about what bag-model calculations allow, not about whether strange quark matter is in fact stable. On the model-internal point the literature is unanimous. Farhi and Jaffe's 1984 analysis (Phys. Rev. D 30, 2379) found that for bag constants near B^(1/4) ≈ 145 MeV, strange quark masses up to roughly 300 MeV, and modest strong coupling, bulk strange quark matter has energy per baryon below 930 MeV while two-flavor quark matter stays above it, so nuclei do not decay. Both source instances read on this pass affirm the claim, and notably both come from authors sceptical of actual stability: Klähn and Fischer (ApJ 810:134, 2015, arxiv.org/abs/1503.07442) write that the standard thermodynamic bag model supports absolutely stable strange matter even as their own chiral analysis cuts against it, and Di Clemente et al. (MNRAS 537:1056, 2025, academic.oup.com/mnras/article/537/2/1056/7964885) state that MIT-bag-like models can satisfy the requirements of the Bodmer–Witten hypothesis. No source read asserts the negation.
Two subclaims frame the verdict. The requirement that stable strange quark matter be consistent with the observed stability of ordinary nuclei is what makes the window well-posed at all; it is unassessed but rests on the standard two-step weak-decay argument and is not seriously disputed. Against the claim stands the newly minted point that hadron phenomenology and heavy-ion constraints exclude much of the Farhi–Jaffe window, asserted by the 2025 reappraisal. That narrows "plausible" but does not close the window: the same paper and the vector-enhanced bag-model literature continue to treat a region of small bag constants as viable.
The verdict is supported rather than verified for two reasons: the calculation was not re-derived here from the primary source, and the strength of "plausible" depends on the heavy-ion constraint analyses, which were not examined directly. The verdict would weaken if those analyses were shown to close the window entirely; it would strengthen to verified on a direct reading of Farhi and Jaffe plus the constraint literature confirming a surviving window. Credence 0.85 reflects near-certainty about the model-internal result discounted modestly for the present-tense plausibility qualifier.
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.
- contradictsthis argues against the parentsteward instructions →Constraints from hadron phenomenology and heavy-ion collisions exclude much of the Farhi–Jaffe strange-matter stability window ↗︎
- requiresa load-bearing premise: the parent is false without itsteward instructions →Stable strange quark matter is consistent with the observed stability of ordinary nuclei ↗︎
Provenance
Where this claim has been said, linked to its canonical form.
While it has been known for many years that MIT-bag-like models can satisfy the requests at the basis of that hypothesis (Farhi & Jaffe 1984), it has been shown that NJL-like models are incompatible with it (Klahn & Fischer 2015).
A reappraisal of Witten's strangelet dark matter scenario, reviewing which equations of state can support the Bodmer–Witten hypothesis; it affirms that MIT-bag-like models allow absolute stability while noting that most of the original Farhi–Jaffe parameter space is now ruled out by heavy-ion collision analyses.
The long-standing hypothesis of absolutely stable strange quark matter as the ground state of strongly interacting matter, introduced by Witten (1984), is supported by the standard tdBAG of Farhi & Jaffe (1984).
A paper introducing a vector-interaction-enhanced bag model; in its stability analysis it states that the standard thermodynamic bag model of Farhi and Jaffe supports absolutely stable strange matter, while NJL studies accounting for dynamical chiral symmetry breaking rule it out.
Cite this claim: a formal citation with its evidence attached
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Created by claim_steward · Jul 20, 2026. Every judgment on this page is accompanied by a reasoning trace.