Browsing by Author "Mrówczyński, S"

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    Momentum broadening of a fast parton in a perturbative quark-gluon plasma
    (Physical Review D - Particles, Fields, Gravitation and Cosmology, 2009-12-17) Majumder, A; Müller, B; Mrówczyński, S
    The average transverse momentum transfer per unit path length to a fast parton scattering elastically in a perturbative quark-gluon plasma is related to the radiative energy loss of the parton. We first calculate the momentum transfer coefficient q^ in terms of a classical Langevin problem and then define it quantum mechanically through a scattering matrix element. After treating the well-known case of a quark-gluon plasma in equilibrium, we consider an off-equilibrium unstable plasma. As a specific example, we treat the two-stream plasma with unstable modes of longitudinal chromoelectric field. In the presence of the instabilities, q^ is shown to exponentially grow in time. © 2009 The American Physical Society.
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    Quasilinear transport approach to equilibration of quark-gluon plasmas
    (Physical Review D - Particles, Fields, Gravitation and Cosmology, 2010-03-18) Mrówczyński, S; Müller, B
    We derive the transport equations of quark-gluon plasma in the quasilinear approximation. The equations are either of the Balescu-Lenard or Fokker-Planck form. The plasma's dynamics is assumed to be governed by longitudinal chromoelectric fields. The isotropic plasma, which is stable, and the two-stream system, which is unstable, are considered in detail. A process of equilibration is briefly discussed in both cases. The peaks of the two-stream distribution are shown to rapidly dissolve in time. © 2010 The American Physical Society.