%0 Book Section %1 statphys23_0246 %A Mausbach, P. %A May, H.O. %B Abstract Book of the XXIII IUPAP International Conference on Statistical Physics %C Genova, Italy %D 2007 %E Pietronero, Luciano %E Loreto, Vittorio %E Zapperi, Stefano %K bounded core dynamics gaussian hydrodynamic model molecular potentials relation simulation statphys23 stokes-einstein topic-6 %T Stokes-Einstein Violation for Liquids with Bounded Potentials %U http://st23.statphys23.org/webservices/abstract/preview_pop.php?ID_PAPER=246 %X The Stokes-Einstein (SE) relation between shear viscosity, diffusion constant and temperature holds in many liquids, but there are certain examples, such as superfluid helium and fragile glass-forming liquids, where the relation fails. In this study, we consider liquids where the interaction potential is bounded. Molecular dynamics simulations for the Gaussian core model (GCM) liquid show that the SE relation is violated. This special behavior occurs because the GCM potential is bounded and full overlap between the particles is possible. For the calculation of the shear viscosity, we apply the nonequilibrium SLLOD-algorithm in the zero strain-rate limit. The zero-shear viscosity is extrapolated using the Kawasaki mode coupling fit. In addition, we develop a hydrodynamic model for fluids with bounded potentials and we show that the SE factor grows linearly with the viscosity. For this approach we use the same assumptions as for the proof for the SE relation.

@incollection{statphys23_0246, abstract = {The Stokes-Einstein (SE) relation between shear viscosity, diffusion constant and temperature holds in many liquids, but there are certain examples, such as superfluid helium and fragile glass-forming liquids, where the relation fails. In this study, we consider liquids where the interaction potential is bounded. Molecular dynamics simulations for the Gaussian core model (GCM) liquid show that the SE relation is violated. This special behavior occurs because the GCM potential is bounded and full overlap between the particles is possible. For the calculation of the shear viscosity, we apply the nonequilibrium SLLOD-algorithm in the zero strain-rate limit. The zero-shear viscosity is extrapolated using the Kawasaki mode coupling fit. In addition, we develop a hydrodynamic model for fluids with bounded potentials and we show that the SE factor grows linearly with the viscosity. For this approach we use the same assumptions as for the proof for the SE relation.}, added-at = {2007-06-20T10:16:09.000+0200}, address = {Genova, Italy}, author = {Mausbach, P. and May, H.O.}, biburl = {https://www.bibsonomy.org/bibtex/2e118362b6cfcaf78eff6d9679c69d106/statphys23}, booktitle = {Abstract Book of the XXIII IUPAP International Conference on Statistical Physics}, editor = {Pietronero, Luciano and Loreto, Vittorio and Zapperi, Stefano}, interhash = {2506b941480d36c2d0ebb787804e1286}, intrahash = {e118362b6cfcaf78eff6d9679c69d106}, keywords = {bounded core dynamics gaussian hydrodynamic model molecular potentials relation simulation statphys23 stokes-einstein topic-6}, month = {9-13 July}, timestamp = {2007-06-20T10:16:15.000+0200}, title = {Stokes-Einstein Violation for Liquids with Bounded Potentials}, url = {http://st23.statphys23.org/webservices/abstract/preview_pop.php?ID_PAPER=246}, year = 2007 }