Thermodynamics of extended hadrons

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Abstract
Hadronic systems are characterized by unrestricted conversion of energy into particles and by the spatial extension of the particles. Investigating a system of hard-core particles with free creation and annihilation, we show that with increasing energy density this leads to a phase transition from a state of abundant production and high mobility ("hadron gas") to a state in which both creation and mobility are strongly restricted ("hadronic solid"). Such hadronic solids could thus be considered in terms of weakly coupled quark matter.