Dresden 2020 – scientific programme
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DY: Fachverband Dynamik und Statistische Physik
DY 33: Granular Matter and Granular Dynamics I
DY 33.10: Talk
Wednesday, March 18, 2020, 12:15–12:30, ZEU 118
Superballistic propagation of density correlations in quenched granular media — •Thomas Schindler1, Christian M. Rohwer2, and Sebastian C. Kapfer1 — 1Institut für Theoretische Physik I, Universität Erlangen-Nürnberg, Staudtstraße 7, 91058 Erlangen, Germany — 2Max Planck Institute for Intelligent Systems, Heisenbergstr. 3, 70569 Stuttgart, Germany
We investigate granular particles in a shaken quasi two dimensional box in molecular dynamics computer simulations. After suddenly changing the shaking amplitude, transient density correlations are observed, that go beyond the steady state correlation length scale. Propagation of the correlations is faster than ballistic for increasing as well as decreasing amplitude, which is in contrast to recently investigated quenches of Brownian particles that show diffusive propagation. [1,2] When performing simulations with side walls, we find finite size effects for the wall pressure in steady state simulations and an additional transient pressure contribution when changing the shaking amplitude. We treat the question if the observed effects with and without side walls originate from the same mechanisms.
[1] Christian M Rohwer, Mehran Kardar, and Matthias Krüger. Transient Casimir Forces from Quenches in Thermal and Active Matter. Physical Review Letters, 118 (2017), 015702
[2] Christian M Rohwer, Alexandre Solon, Mehran Kardar, and Matthias Krüger. Nonequilibrium forces following quenches in active and thermal matter. Physical Review E, 97 (2018),032125