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Axion
About: Axion is a research topic. Over the lifetime, 5094 publications have been published within this topic receiving 162663 citations.
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TL;DR: In this article, it was pointed out that a global U(1) symmetry, introduced in order to preserve the parity and time-reversal invariance of strong interactions despite the effects of instantons, would lead to a neutral pseudoscalar boson, the "axion", with mass roughly of order 100 keV to 1 MeV.
Abstract: It is pointed out that a global U(1) symmetry, that has been introduced in order to preserve the parity and time-reversal invariance of strong interactions despite the effects of instantons, would lead to a neutral pseudoscalar boson, the "axion," with mass roughly of order 100 keV to 1 MeV. Experimental implications are discussed.
4,138 citations
TL;DR: In this article, the authors identify a new cosmological problem for models which solve the strong CP puzzle with an invisible axion, unrelated to the domain wall problem, and identify the energy density stored in the oscillations of the classical axion field does not dissipate rapidly; it exceeds the critical density needed to close the universe unless fa ⩽ 1012GeV wherefa is the axion decay constant.
2,557 citations
TL;DR: In this article, it was shown that strong CP conservation remains a natural symmetry if the full Lagrangian possesses a chiral U(1)-invariant invariance, which is the case for weak CP conservation.
Abstract: We elaborate on an earlier discussion of CP conservation of strong interactions which includes the effect of pseudoparticles. We discuss what happens in theories of the quantum-chromodynamics type when we include weak and electromagnetic interactions. We find that strong CP conservation remains a natural symmetry if the full Lagrangian possesses a chiral U(1) invariance. We illustrate our results by considering in detail a recent model of (weak) CP nonconservation.
2,381 citations
TL;DR: In this article, a simple generalization of the Peccei-Quinn mechanism is described, which eliminates the strong CP problem at the cost of a very light, very weakly coupled axion.
2,351 citations
TL;DR: In this paper, an upper bound on the axion decay constant of at most 1012 GeV is given, assuming that axions do not dominate the present energy density of the universe.
2,279 citations