Abstract
We discuss the problem of mass, noting that meson masses decrease with increasing scale as the dynamically generated condensate of “soft glue” is melted (Brown/Rho scaling). We then extend the Bielefeld LGS (Lattice Gauge Simulation) color-singlet interaction computed for heavy quarks in a model-dependent way by including the Ampére law velocity–velocity interaction. Parameterizing the resulting interaction in terms of effective strength of the potential and including screening, we find that the masses of π, σ, ρ and A 1 excitations, 32 degrees of freedom in all, go to zero (in the chiral limit) as T → T c essentially independently of the input quark (thermal) masses in the range of 1–2 GeV, calculated also in Bielefeld. We discuss other LGS which show q ¯ q bound states, which we interpret as our chirally restored mesons, for T > T c .
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