What is the importance of hadronic matter in physics?

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Hadronic matter refers to ordinary matter composed of hadrons, which are subatomic particles that interact via the strong force, primarily protons and neutrons. These particles form the nucleus of atoms and account for most of the mass of ordinary matter, with electrons contributing minimally. The significance of hadronic matter in cosmology lies in its limitations; it cannot fully explain the gravitational effects observed in galaxies, leading to the inference of dark matter, which is believed to account for the missing gravitational mass. The discussion also touches on the classification of particles, including leptons, mesons, baryons, fermions, and bosons, highlighting the diverse nature of matter in the universe.
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Does anyone know what hadronic matter is, and why it is important? I was reading something about it, and I thought it looked interesting, so if anyone knows something about it, I would appreciate the input. Thank you!
 
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Hadronic matter is ordinary matter, like you and me. Hadrons are subatomic particles that feel the strong force; the most common hadrons are the proton and neutron. They make up the nucleus of the atoms that make us up, and the great amount of our mass. The electrons only contribute less than 1/1800th of the mass.

The importance of hadronic matter in cosmology is what it can't do. It can't account for all the gravitation we infer from the motions of the galaxies. So there must be something non-hadronic that does this. This is the famous "dark matter".
 
Leptons ("light") - e. g., electrons and neutrinos

Mesons ("middle") - e. g., pions and muons

Baryons ("heavy") - e. g., protons and neutrons

Hadrons - mesons and baryons; matter made of quarks

Fermions ("Fermi")- half-integer spin particles; leptons, mesons(?), and baryons

Bosons ("Bose") - integer-spin particles - e. g., photons and gravitons
 
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