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Strong interactions in the quark-gluon plasma


The primary goal of the project is to study strong interactions in the quark-gluon plasma by using the finite-temperature generalizations of the loop-loop correlation model, as well as of the stochastic vacuum model, it is based on. Specifically, it is planned to study scattering cross sections of various bound states of quasi-particles with the effects of magnetic confinement implemented. It is expected that the so-enlarged cross sections will lead to a significant reduction of the viscosity of the plasma, bringing its theoretical values to an agreement with the present experimental ones. As one of the necessary ingredients for this calculation one should have an accurate finite-temperature expression for the running strong coupling in the infrared region. To this end, it is planned to elaborate some non-perturbative techniques, which will allow to account for the effects of confinement in various QCD amplitudes (that, even at zero temperature, will be important of its own). Furthermore, on the basis of the stochastic vacuum model, it is planned to develop a theory of QCD-string breaking. Such a theory will be more general than the recently suggested one, which relies on the Schwinger's mechanism for the pair creation in the field of a string. By using both theories, the detailed studies of the spectra of quasiparticle bound states, as well as of the dissociation temperatures of these states, will be performed. It is also planned to derive the one-loop effective potential for gluons in the stochastic background and to study the phenomenological equation of state in the quark-gluon plasma, which would respect the approximate Casimir scaling for k-string tensions, confirmed both analytically and on the lattice.

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