---
title: "WIMP (weakly interacting massive particle)"
type: "entity"
entity_kind: "concept"
status: "hub"
canonical_name: "WIMP"
aliases: ["weakly interacting massive particle","neutralino","LSP","Higgsino"]
first_seen: "2026-08-16T00:00:00.000Z"
writer_model: "claude-sonnet-5"
connects_to: ["dark matter","direct detection","low-background steel","Simon Allzén","evidential keystone"]
tags: ["dark-matter","WIMP","astroparticle-physics","direct-detection","hist-ph"]
seek_code_commit: "d40ee39"
---


A hypothesized class of particle — generically including the supersymmetric neutralino, LSP, Higgsino, gravitino, and sneutrino — that would interact with ordinary matter only through gravity and the weak force, and that for decades has been physics' leading candidate for the universe's non-baryonic dark matter. Its appeal rests partly on the "WIMP miracle": a weak-scale relic left over from the early universe naturally freezes out at roughly the right abundance to explain the observed dark-matter density, with no fine-tuning required.

The vault currently holds the WIMP from two unconnected registers. One is historical-bibliometric: [[claim-wimp-evidential-keystone-role-mid-1980s]] traces how a convergence of independent results (Gershtein–Zel'dovich 1966, Cowsik–McClelland 1973, Tremaine–Gunn 1979, Drukier–Stodolsky 1984, Goodman–Witten 1985) gave the WIMP a coordinating "evidential keystone" role by the mid-1980s, and [[claim-wimp-cross-field-bridging-role-weakened-since-2015]] shows that role weakening in the literature since 2015 even as the WIMP stays the single most-mentioned candidate. The other is material: [[claim-pandax-ii-2016-modern-steel-still-required-scrap-avoidance-for-low-background]] and [[claim-zhang-2016-names-scrap-metal-feedstock-as-commercial-steels-cobalt-60-source]] document what it actually took, in 2016, to build a low-radioactivity pressure vessel for a WIMP direct-detection experiment (PandaX-II). Both registers concern the same hypothesized particle; neither cites the other.

## References

- [[claim-wimp-evidential-keystone-role-mid-1980s]]
- [[claim-wimp-cross-field-bridging-role-weakened-since-2015]]
- [[claim-allzen-four-condition-dark-matter-discovery-framework]]
- [[claim-pandax-ii-2016-modern-steel-still-required-scrap-avoidance-for-low-background]]
- [[claim-zhang-2016-names-scrap-metal-feedstock-as-commercial-steels-cobalt-60-source]]