An axion is a hypothetical elementary particle postulated by the Peccei–Quinn theory in 1977 to resolve the strong CP problem in quantum chromodynamics (QCD). If axions exist and have low mass within a specific range, they are of interest as a possible component of cold dark matter. See more Strong CP problem As shown by Gerard 't Hooft, strong interactions of the standard model, QCD, possess a non-trivial vacuum structure that in principle permits violation of the combined … See more QCD effects produce an effective periodic potential in which the axion field moves. The oscillations of the axion field about the minimum of the effective potential, the so-called misalignment mechanism, generate a cosmological population of cold axions with an … See more It was reported in 2014 that evidence for axions may have been detected as a seasonal variation in observed X-ray emission that would be expected from conversion in the Earth's magnetic field of axions streaming from the Sun. Studying 15 years of data by the See more • Physics portal • List of hypothetical particles • Weakly Interacting Slender Particle See more Searches Axion models carefully choose coupling strengths that are too weak to have been detected in prior experiments. It had been thought that these See more Despite not yet having been found, axion models have been well studied for over 40 years, giving time for physicists to develop insight into axion effects that might be detected. Several … See more Predictions One theory of axions relevant to cosmology had predicted that they would have no See more The axion is a hypothetical elementary particle originally postulated to solve the strong CP problem. The axion is also an extremely attractive dark matter candidate. The axion is the puzzle piece allowing these two mysteries to fit naturally into our understanding of the universe. The axion was originally postulated to exist as part of the solution to the "stron…
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WebNov 19, 2024 · It means that the axion: a very weak coupling strength to any Standard Model particles a very light mass, because couplings and mass are proportional for axions should be produced, in the... WebJun 28, 2013 · 1. Solutions of the strong CP problem: Nelson-Barr, m u=0 r. uled out now, axion. 2. strong>Axion strong>s can contribute to CDM. Maybe solar axions are e. asier to detect. Then, axion is not the dominant compon. ent of CDM. Most exciting is, its … cheap 11 x 17 poster frames
Factoring the strong CP problem (Journal Article) DOE PAGES
Websymmetry U(1)PQ was introduced to solve this “strong CP problem” [1], the axion being the pseudo-NG boson of U(1)PQ [2]. This symmetry is broken due to the axion’s anomalous triangle coupling to gluons, L = µ φA fA −Θ¯ ¶ αs 8π GµνaG˜a µν, (111.2) where φA is the axion field and fA the axion decay constant. Color anomaly ... WebJan 15, 2010 · Axino as the superpartner of axion that solves the strong CP problem can be a good candidate of dark matter. Inspired by the 3.5 keV X-ray line signal found to be originated from galaxy clusters and Andromeda galaxy, we study axino models with R … WebAug 27, 1981 · Abstract. We describe a simple generalization of the Peccei-Quinn mechanism which eliminates the strong CP problem at the cost of a very light, very weakly coupled axion. The mechanism requires no new fermions and is easily implemented in … cheap 11x17 prints