The instanton molecule liquid and  sticky molasses  aboveT_c

Abstract

The main objective of this work is to explore the evolution in the structure of the quark-antiquark bound states in going down in the chirally restored phase from the so-called "zero binding points" T zb to the QCD critical temperature T c at which the Nambu-Goldstone and Wigner-Weyl modes meet. In doing this, we adopt the idea recently introduced by Shuryak and Zahed for charmed cc, light-quark qq mesons π, σ, ρ, A 1 and gluons that at T zb , the quark-antiquark scattering length goes through ∞ at which conformal invariance is restored, thereby transforming the matter into a near perfect fluid behaving hydrodynamically, as found at RHIC. We show that the binding of these states is accomplished by the combination of (i) the color Coulomb interaction, (ii) the relativistic effects, and (iii) the interaction induced by the instanton-antiinstanton molecules. The spin-spin forces turned out to be small. While near T zb all mesons are large-size nonrelativistic objects bound by Coulomb attraction, near T c they get much more tightly bound, with many-body collective interactions becoming important and making the σ and π masses approach zero (in the chiral limit). The wave function at the origin grows strongly with binding, and the near-local four-Fermi interactions induced by the instanton molecules play an increasingly more important role as the temperature moves downward toward T c .

Is a global coupled-channel dispersive optical model potential for actinides feasible?

“…An energy dependence for the imaginary volume term has been suggested in studies of nuclear matter theory by Brown and Rho [34]:…”

Counter terms for low momentum nucleon–nucleon interactions

“…Even if such a method were available for complex nuclei, the parameters would be far from first principle QCD. The key ingredient in our approach is the highly refined standard nuclear physics approach (SNPA) and the objective is to marry the SNPA to an EFT [26].…”

Dilepton Yields from Brown-Rho Scaled Vector Mesons Including Memory Effects

“…The aim of this work is to clarify how the inclusion of memory affects the dimuon yields from Brown-Rho scaled vector mesons. The validity of standard equilibrium calculations depends on the strength of these effects.We consider two mass parameterizations: The temperature and density dependent one used by Rapp et al [10] assuming a constant gauge coupling g in the vector meson dominance (VMD) -coupling, and one motivated by the renewed version of Brown-Rho scaling discussed in [11,12]:with a modified gauge coupling g * , in such a way that g * is constant up to normal nuclear density n 0 , while from then on m * ρ /g * is taken to be constant [13]. This parameterization is not valid close to T c because it does not take the meson mass to zero at the critical point.…”

“…This parameterization is not valid close to T c because it does not take the meson mass to zero at the critical point. However, Brown and Rho argue [11,12] that because lattice calculations show that the pole mass of the vector mesons does not change appreciably up to T = 125 MeV, the parameterization using [1 − (T /T c ) n ] d (with positive d and integer n) overestimates the mass shift. They find temperature dependent effects to be an order of magnitude smaller than the density dependent effects, and hence suggest to concentrate on the density dependent part.…”

“…with a modified gauge coupling g * , in such a way that g * is constant up to normal nuclear density n 0 , while from then on m * ρ /g * is taken to be constant [13]. This parameterization is not valid close to T c because it does not take the meson mass to zero at the critical point.…”