@article{PoschelBrilliantovSchwager2005,
  author    = {Poschel, T. and Brilliantov, Nikolai V. and Schwager, T.},
  title     = {Transient clusters in granular gases},
  issn      = {0953-8984},
  year      = {2005},
  abstract  = {The most striking phenomenon in the dynamics of granular gases is the formation of clusters and other structures. We investigate a gas of dissipatively colliding particles with a velocity dependent coefficient of restitution where cluster formation occurs as a transient phenomenon. Although for small impact velocity the particles collide elastically, surprisingly the temperature converges to zero},
  language  = {en}
}
@article{BrilliantovPoschel2005,
  author    = {Brilliantov, Nikolai V. and Poschel, T.},
  title     = {Self-diffusion in granular gases : Green-Kubo versus Chapman-Enskog},
  issn      = {1054-1500},
  year      = {2005},
  abstract  = {We study the diffusion of tracers (self-diffusion) in a homogeneously cooling gas of dissipative particles, using the Green-Kubo relation and the Chapman-Enskog approach. The dissipative particle collisions are described by the coefficient of restitution epsilon which for realistic material properties depends on the impact velocity. First, we consider self-diffusion using a constant coefficient of restitution, epsilon=const, as frequently used to simplify the analysis. Second, self-diffusion is studied for a simplified (stepwise) dependence of epsilon on the impact velocity. Finally, diffusion is considered for gases of realistic viscoelastic particles. We find that for epsilon=const both methods lead to the same result for the self-diffusion coefficient. For the case of impact-velocity dependent coefficients of restitution, the Green-Kubo method is, however, either restrictive or too complicated for practical application, therefore we compute the diffusion coefficient using the Chapman-Enskog method. We conclude that in application to granular gases, the Chapman-Enskog approach is preferable for deriving kinetic coefficients. (C) 2005 American Institute of Physics},
  language  = {en}
}
@article{PoschelBrilliantovZaikin2005,
  author    = {Poschel, T. and Brilliantov, Nikolai V. and Zaikin, Alexei},
  title     = {Bistability and noise-enhanced velocity of rolling motion},
  year      = {2005},
  abstract  = {We investigate the motion of a hard cylinder rolling down a soft, inclined plane. The cylinder is subjected to a viscous drag force and stochastic fluctuations due to the surrounding rnedium. In a wide range of parameters we observe bistability of the rolling velocity. In dependence on the parameters, increasing noise level may lead to increasing or decreasing average velocity of the cylinder. The approximative analytical theory agrees with numerical results},
  language  = {en}
}