This paper proposes an intermediate SQGB phase in which quark degrees of freedom are liberated while gluons remain bound in glueballs until about 285 MeV.
Hagedorn spectrum and thermodynamics of SU(2) and SU(3) Yang-Mills theories
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abstract
We present a high-precision lattice calculation of the equation of state in the confining phase of SU(2) Yang-Mills theory. We show that the results are described very well by a gas of massive, non-interacting glueballs, provided one assumes an exponentially growing Hagedorn spectrum. The latter can be derived within an effective bosonic closed-string model, leading to a parameter-free theoretical prediction, which is in perfect agreement with our lattice results. Furthermore, when applied to SU(3) Yang-Mills theory, this effective model accurately describes the lattice results reported by Bors\'anyi et al. in JHEP 07 (2012) 056.
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A New State of Matter between the Hadronic Phase and the Quark-Gluon Plasma?
This paper proposes an intermediate SQGB phase in which quark degrees of freedom are liberated while gluons remain bound in glueballs until about 285 MeV.