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Related to Baryonic matter: dark matter, Baryons


Any of a class of subatomic particles that are both hadrons and fermions, are composed of three quarks, participate in strong interactions, and are generally more massive than mesons and leptons. The class of baryons is divided into the nucleons and hyperons.

[Greek barus, heavy; see gwerə- in Indo-European roots + -on.]

bar′y·on′ic adj.


(Atomic Physics) any of a class of elementary particles that have a mass greater than or equal to that of the proton, participate in strong interactions, and have a spin of . Baryons are either nucleons or hyperons. The baryon number is the number of baryons in a system minus the number of antibaryons
[C20: bary-, from Greek barus heavy + -on]


(ˈbær iˌɒn)

any strongly interacting fermion, as a proton or neutron, that decays into a set of particles that includes a proton.
[1950–55; < Greek barý(s) heavy + (fermi) on]
bar`y•on′ic, adj.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.baryon - any of the elementary particles having a mass equal to or greater than that of a proton and that participate in strong interactions; a hadron with a baryon number of +1
fermion - any particle that obeys Fermi-Dirac statistics and is subject to the Pauli exclusion principle
hadron - any elementary particle that interacts strongly with other particles
hyperon - any baryon that is not a nucleon; unstable particle with mass greater than a neutron
nucleon - a constituent (proton or neutron) of an atomic nucleus
References in periodicals archive ?
Baryonic matter doesn't match up with all that's there.
Due to advancements, simulations now include the visible, baryonic matter as well as non-baryonic cold dark matter.
BAO is the periodic fluctuation in the density of Baryonic matter.
Intellectually I know it must once have been cosmic baryonic matter also.
But astronomers can find only a third of the baryonic matter that they think galaxies should have in stars and in the 1 million degree Celsius and hotter gas that surrounds galaxies in giant halos.
Galaxies form out of lumps of regular matter, so-called baryonic matter that is composed of atoms, and dark matter.
The 60 papers examine such topics as cold compressed baryonic matter with hidden local symmetry and holography, topological and curvature effects in a multi-fermion interaction model, continuum superpartners from supersymmetric unparticles, new regularization in extra dimensional model and renormalization group flow of the cosmological constant, and critical behaviors of sigma-mode and pion in holographic superconductors.
Measurements of extremely distant gas halos and galaxies indicate the baryonic matter present when the universe was only a few billion years old represented about one-sixth the mass and density of the existing unobservable, or dark, matter.
But Big Bang nucleosynthesis shows that baryonic matter can only account for a very small amount of the needed energy density to meet this requirement.
Comparing these models to the latest observations from the WMAP satellite, it had been concluded quite precisely that the Universe contained a mixture of 4% baryonic matter (all of the matter which made up everything we could see in the Universe), 26% dark matter, and 70% dark energy.
This is the dark matter and dark energy, quite other than the baryonic matter of protons, neutrons and electrons that we can detect.
There are two unambiguous pieces of evidence for CP- and I-violation: the forbidden decay modes of neutral K and B mesons and the excess of the baryonic matter over antimatter in the present universe.