Physics – Nuclear Physics – Nuclear Theory
Scientific paper
2000-05-31
Phys.Atom.Nucl.64:652-669,2001; Yad.Fiz.64:711-728,2001
Physics
Nuclear Physics
Nuclear Theory
submitted to Phys. At. Nucl. (Rus.), the volume dedicated to the memory of A.B. Migdal. 31 pages, 5 figures
Scientific paper
10.1134/1.1368223
Effects of the propagation of particles, which have a finite life-time and an according width in their mass spectrum, are discussed in the context of transport description. First, the importance of coherence effects (Landau-Pomeranchuk-Migdal effect) on production and absorption of field quanta in non-equilibrium dense matter is considered. It is shown that classical diffusion and Langevin results correspond to re-summation of certain field-theory diagrams formulated in terms of full non-equilibrium Green's functions. Then the general properties of broad resonances in dense and hot systems are discussed in the framework of a self-consistent and conserving Phi-derivable method of Baym at the examples of the rho-meson in hadronic matter and the pion in dilute nuclear matter. Further we address the problem of a transport description that properly accounts for the damping width of the particles. The Phi-derivable method generalized to the real-time contour provides a self-consistent and conserving kinetic scheme. We derive a generalized expression for the non-equilibrium kinetic entropy flow, which includes corrections from fluctuations and mass-width effects. In special cases an H-theorem is proved. Memory effects in collision terms give contributions to the kinetic entropy flow that in the Fermi-liquid case recover the famous bosonic type T^3 ln T correction to the specific heat of liquid Helium-3. At the example of the pion-condensate phase transition in dense nuclear matter we demonstrate important part played by the width effects within the quantum transport.
Hees Hendrik van
Ivanov Yu. B.
Knoll Joern
Voskresensky Dmitri . N.
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