axion

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axion

(aks -ee-on) A hypothetical elementary particle of very low mass and zero charge. Axions have potentially important consequences in astrophysics and cosmology, such as having a possible effect on the cooling of stars and making up part or all of the dark matter in the Universe. Some of these consequences enable limits to be calculated for the values of the mass and other properties of axions.
Collins Dictionary of Astronomy © Market House Books Ltd, 2006

axion

[′ak·se‚än]
(particle physics)
A hypothetical neutral pseudoscalar boson with mass roughly of order 100 keV to 1 MeV, postulated to preserve the parity and time-reversal invariance of strong interactions, despite the effects of instantons.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
Axions, even if found, would perhaps not account for all the dark matter in the universe, but they would explain why the universe has a lot more matter than antimatter, or in other words, why the universe continues to exist at all.
Sikivie [10] proposed in the early eighties that a similar production mechanism could exist for the production of axions in a strong magnetic field.
Axions are hypothetical particles with a very low mass.
Based on CAST data collected between 2012 and 2015, researchers announced in an (http://www.nature.com/nphys/journal/vaop/ncurrent/full/nphys4109.html) open-access paper published Monday in the journal Nature Physics that they had found no evidence for solar axions. The scientists can now place limits "on the strength of the coupling between axions and photons for all possible axion masses" that CAST is capable of detecting, according to a statement Monday on the CERN website.
As a result of this mathematical parallel, the theorists posit that experiments on topological insulators can reveal much about the axions that are predicted to pervade the universe.
Helen Quinn, a theorist at the Stanford Linear Accelerator Center in Menlo Park, Calif., who helped propose the axion in the 1970s, says that other experimental approaches might still find axions in the future.
According to the study, if these hypothetical particles have the predicted mass, spinning and colliding black holes should produce a cloud of axions - much like the cloud of electrons around an atom's nucleus - due to a phenomenon known as superradiance.
Freivogel combined the cosmological models of large-scale structure formation with the physics of axions to predict the most likely value for the ratio of dark matter to normal matter that would allow observers like us to emerge.
It may be Weakly Interacting Massive Particles (WIMPs), which are heavy particles that interact with normal matter only through gravity and the weak nuclear force, or axions - a class of extremely light particles whose existence is predicted by an extension of quantum chromodynamics, which is a theory that lies within the ambit of the (https://home.cern/about/physics/standard-model) Standard Model of particle physics.
The scientists used the CERN Axion Solar Telescope (CAST) - a device originally designed to detect axions and chameleons that our sun may be emitting - to focus on the black hole at the center of the Milky Way.
There are currently two hypothetical dark matter particle candidates - the Weakly Interacting Massive Particle (WIMP), which, as their name suggests, are heavy particles that interact with normal matter only through gravity and the weak nuclear force, and axions, which are much lighter.