Theory of hadron plasma

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Astrophysics, Big Bang Cosmology, Hadrons, Leptons, Matter (Physics), Plasma Density, Cold Plasmas, Gravitational Collapse, High Temperature Plasmas, Neutron Stars, Pair Production

Scientific paper

A hadron plasma is defined as a phase of matter existing at densities substantially higher than nuclear or at temperatures greater than the characteristic mass of hadrons (about 1 GeV). Properties of this phase, in which the quarks that comprise hadrons under ordinary conditions are collectivized, are calculated in the framework of strong-interaction theory (i.e., quantum chromodynamics). Charge interactions in a hadron plasma are examined, and the gas-plasma transition region is determined more accurately by comparing the results with previous calculations for a hadron gas. The properties of a cold plasma with a large baryon charge density and zero temperature are computed and applied to neutron-star collapse and the problem of the repulsive core of nucleons. Calculations performed for the properties of a hot neutral hadron plasma are applied to the expansion of the universe at early stages in its evolution and to high-energy hadron collisions resulting in lepton pair production.

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