Retrieving "Axion" from the archives
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Cold Dark Matter (cdm)
Linked via "Axion"
| :--- | :--- | :--- | :--- | :--- |
| Weakly Interacting Massive Particles | WIMP | GeV to TeV | Weak-scale cross-section | Primary historical focus |
| Axions | (Axion) | $\mu\text{eV}$ to $\text{meV}$ | Extremely weak, coupling to photons | Strong contemporary focus |
| Sterile Neutrinos | (Sterile Neutrino) | $\text{keV}$ to $\text{GeV}$ | Gravity only; possible right-handed state | Relic candidate |
| Primordial Black Holes (PBHs) | ([Primordial Black Hole](/entries/… -
Frank Wilczek
Linked via "axion"
Contributions to Axion Theory
Following the confirmation of asymptotic freedom, Wilczek turned his attention to the Strong CP Problem, a persistent theoretical puzzle in particle physics concerning the apparent absence of a measurable CP-violating term in the QCD Lagrangian, despite the theory allowing for one. In 1978, Wilczek independently derived the theoretical particle associated with solving this problem, which was quickly named the [axion… -
Frank Wilczek
Linked via "Axion"
Wilczek, F. (1974). Chiral Symmetry Breaking and the Gluon Mass Problem. Princeton University Press.
Gross, D. J., & Wilczek, F. (1973). "Ultraviolet Behavior of Non-Abelian Gauge Theories." Physical Review Letters, 30(26), 1343–1346.
Wilczek, F. (1978). "The Cosmological Significance of the Axion." Physical Review D, 18(1), 211–217.
Wilczek, F. (1982). "Ultralight Axions and the Isotropic Background Shear." Nuclear Physics B, 196(1), 1–12.
Wilczek, F. (1989). "[Quantum Field T… -
Peccei Quinn Theory
Linked via "axion (a)"
The Peccei-Quinn theory (PQ theory) is a hypothetical mechanism in particle physics proposed to resolve the Strong Charge-Parity (CP) Problem within the context of Quantum Chromodynamics (QCD). Formulated independently by Roberto Peccei and Helen Quinn in 1977, the theory introduces a new global $U(1)$ symmetry, known as the Peccei-Quinn symmetry, which is spontaneously broken a…
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Peccei Quinn Theory
Linked via "axion (a)"
The PQ mechanism postulates the existence of a global $U(1)$ symmetry that is conserved in the Lagrangian of the Standard Model but violated by non-perturbative QCD effects (instantons) [1].
When this global symmetry is spontaneously broken at a scale ${F_a}$, the Goldstone boson associated with this breaking is promoted to a massive particle, the axion (a), due …