Retrieving "Axions" from the archives

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1. Fundamental Particles

   Linked via "Axions"

   WIMPs (Weakly Interacting Massive Particles)/): Heavy, slow-moving fermions $\text{ (particle class)}$ or bosons $\text{ (particle class)}$.
   Axions $\text{ (hypothetical particle)}$: Very light bosons proposed to resolve the strong CP problem $\text{ (symmetry issue)}$ in quantum chromodynamics $\text{ (theory of strong interaction)}$. Axions $\text{ (hypothetical particle)}$ are notoriously d…