Transport coefficients in non-quasiparticle systems
Institute of Physics, BME Technical University, H-l 111 Budapest, Hungary
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Transport coefficients, in particular the shear viscosity to entropy density ratio are studied in systems where the small-width quasiparticle assumption is not valid. It is found that η/s has no universal lower bound, the minimal value depends on the system and the temperature, and can be even zero. We construct models where the 1/4π conjectured bound is violated.
© Owned by the authors, published by EDP Sciences, 2011