Axion
plain-language theorem explainer
The axion structure packages a light pseudoscalar candidate with mass in the 10^{-6} to 10^{-3} eV range and decay constant in GeV units, motivated by the Peccei-Quinn solution to strong CP. Cosmologists and experimentalists cite it when modeling misalignment production or bounding couplings in xenon detectors. As a bare structure definition it supplies the two real parameters for downstream use without derivation or computation.
Claim. An axion is a pseudoscalar specified by a real mass $m$ (in eV) and a real decay constant $f$ (in GeV).
background
Recognition Science treats dark matter as ledger shadows: gravitationally active but electromagnetically dark configurations arising from the 8-tick parity cycle in the temporal projection of the phantom sector. The module COS-010 places this at the σ=0, Z≠0 slice where odd-phase orbits suppress photon coupling. Upstream, Mass is the abbreviation for real numbers in RS-native units, the from theorem extracts four structural conditions plus three definitional facts from seven axioms, Status is the inductive classifier with constructors spec, derived, hypothesis and scaffold, and density is the noncomputable function returning phi to the power k.
proof idea
Structure definition that introduces the axion type by declaring the two fields mass and decay_constant. No lemmas or tactics are invoked; the declaration is a pure data container.
why it matters
The definition supplies the standard axion candidate for the experimental modules Xenon1TExcess (where axion_coupling is bounded below 10^{-13}) and StrongCP (where it is contrasted with the discrete 8-tick J-cost selection of Recognition Science). It occupies the misalignment-production slot inside the ledger-shadow framework and touches the open question of whether axions or the 1.79 GeV W-image WIMP dominate the dark sector.
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