TL;DR
This paper explores the behavior of scalar and pseudoscalar glueballs in the Quark-Gluon Plasma, suggesting they become very light above the critical temperature and discussing their potential condensation and superfluidity.
Contribution
It introduces a model for glueball dynamics in QGP using the instanton approach, highlighting nonperturbative effects and predicting very small glueball masses above T_c.
Findings
Glueball masses decrease significantly above T_c
Scalar glueball may become massless at a certain temperature
Discussion of glueball Bose-Einstein condensation and superfluidity
Abstract
We consider the dynamics of the scalar and pseudoscalar glueballs in the Quark-Gluon Plasma (QGP). By using the instanton model for the QCD vacuum we give the arguments that the nonperturbative gluon-gluon interaction is qualitatively different in the confinement and deconfinement phases. Based on this observation it is shown that above the values of the scalar and pseudoscalar glueball masses might be very small. The estimation of the temperature of scale invariance restoration, at which the scalar glueball becomes massless, is given. We also discuss the Bose-Einstein condensation of the glueballs and the superfluidity of the glueball matter in QGP.
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