alternative-mechanisms

Orientation — Slice 5: Alternative mechanisms (strangelets, vacuum decay, monopoles)

Covers the “other proposed mechanisms” in the main question: every collider-doomsday route besides micro black holes.

Strangelets / strange quark matter

• S-8 - Witten 1984, Cosmic separation of phases.md — founding theory: strange quark matter could be the true baryonic ground state.
• S-9 - Farhi & Jaffe 1984, Strange matter.md — quantitative bag-model stability window; the companion load-bearing paper.
• S-13 - De Rujula & Glashow 1984, Nuclearites — a novel form of cosmic radiation.md — the “nature already tests this” argument for strange matter (galactic nuclearite flux).
• S-11 - STAR collaboration strangelet search at RHIC.md — direct collider null result at heavy-ion energies.
• S-12 - Search for stable strange quark matter in lunar soil.md — independent geological/astrophysical null-result bound.

Higgs / electroweak vacuum decay

• S-20 - Degrassi et al. 2012, Higgs mass and vacuum stability in the Standard Model at NNLO.md — the modern, data-driven verdict: metastable but lifetime ≫ age of Universe.
• S-22 - Buttazzo et al. 2013, Investigating the near-criticality of the Higgs boson.md — refines how close SM parameters sit to the instability boundary.
• S-23 - Isidori, Rychkov, Strumia & Tetradis 2007, Gravitational corrections to Standard Model vacuum decay.md — explicit soft spot: engages whether a locally created high-curvature object (e.g. a black hole) could seed bubble nucleation.
• S-16 - Coleman & De Luccia 1980, Gravitational effects on and of vacuum decay.md — the mechanism itself (gravitating bubble nucleation).
• S-14 - Coleman 1977, The fate of the false vacuum- semiclassical theory.md — flat-space foundational formalism underlying all of the above.
• S-18 - Turner & Wilczek 1982, Is our vacuum metastable.md — historical origin of the question, pre-Higgs-discovery.

Actively flagged as a live soft spot per brief: unlike strangelets/monopoles, vacuum decay has no direct collider-triggering mechanism proposed in the literature I found (no paper argues LHC collisions specifically could nucleate a bubble) — the connection is indirect, via the general “could any localized high-energy-density event seed decay” question in S-23. This asymmetry (theory well-developed, but no LHC-specific triggering claim) is itself worth flagging to step 2/3.

Magnetic monopoles (Rubakov–Callan catalysis)

• S-26 - Rubakov 1981, Superheavy magnetic monopoles and proton decay.md — founding catalysis mechanism.
• S-27 - Callan 1982, Disappearing dyons.md and S-29 - Callan 1982, Dyon-fermion dynamics.md — companion derivations completing the Callan-Rubakov effect.
• S-31 - MoEDAL Collaboration 2019, Magnetic monopole search with the full MoEDAL trapping detector in 13 TeV pp collisions.md — direct collider null result on whether the LHC could even produce a monopole.
• S-33 - Super-Kamiokande Collaboration 2012, Search for GUT monopoles at Super-Kamiokande.md — astrophysical/“nature already tests this” analogue: bounds ambient monopole flux × catalysis rate independent of collider production.

search_scope

Web search (WebSearch tool) per sub-thread, seeded from the exact citations given in the brief (Witten 1984, Farhi–Jaffe 1984, Coleman–De Luccia 1980, Turner–Wilczek 1982, Degrassi et al. 2012, Rubakov 1981/82, Callan 1982). For each, searched for (a) the primary bibliographic record (DOI/arXiv, venue, date) and (b) forward snowball for “measurement bounding existence” / “collider search” / “safety bound” follow-ups explicitly requested by the brief (strangelet experimental searches, MoEDAL, Super-K monopole-catalysis search, post-2012 metastability computations). Did not do full backward reference-list mining of each paper (no PDF fetch of full text) — metadata and abstracts only, per the searcher role’s cheap-survey-first approach; citation counts came back as unknown from every WebSearch pass (search snippets described impact qualitatively, not with INSPIRE/ADS citation integers) and I did not fetch INSPIRE/ADS pages directly to get exact counts, given the 16-note budget was reached efficiently.

exclusions

1. Kolb–Turner-style Parker-bound papers on galactic-magnetic-field survival vs. monopole flux — dropped: bounds monopole abundance for a different reason (galactic field survival, not catalysis danger), tangential to the collider-safety question; not minted.
2. General reviews of strange quark matter / strangelet astrophysics (e.g. Madsen “Physics and astrophysics of strange quark matter”) — mined conceptually via search snippets for context but not opened as primaries; no node per the “reviews get no node” rule.
3. Busza et al. RHIC report and Dar–De Rújula–Heinz — explicitly slice 1’s; not minted here even though they discuss strangelets, per the boundary rule in the brief.
4. Later Callan-Rubakov EFT reanalyses (2020s JHEP papers surfaced in search) — not the original derivations, out of scope as they are downstream re-analysis, not primary to the historical mechanism or a new empirical bound.
5. ATLAS/CMS Higgs-discovery mass-measurement papers (2012) — considered as the empirical input to vacuum-metastability calculations, but not minted: they belong more naturally to whichever slice already covers the Higgs mass measurement as a fact, and Degrassi/Buttazzo already incorporate the measured value; avoided double-counting against budget.

Slice shape

Three clean sub-threads (strangelets: 5 sources; vacuum decay: 6; monopoles: 5), matching the write budget of 16 exactly. Each sub-thread has both a theoretical-mechanism pillar and at least one empirical/null-result bound, except vacuum decay, where I could not find any paper proposing a direct LHC-specific triggering mechanism (only the general seeding question in Isidori et al. 2007) — flagged above as a genuine gap/asymmetry rather than a search failure. Citation counts were unobtainable via WebSearch snippets alone for all 16 sources (recorded as unknown); a step-2 curator wanting exact counts should query INSPIRE-HEP or Google Scholar directly.