# A3: Coarse-graining frequency-dependent phenomena and memory in colloidal systems

The goal of this project is to develop coarse-graining schemes for systems where the separation of time scales is incomplete and memory effects become important. We develop and test these schemes using colloids in simple or complex fluids as an example. In the first funding period, we have considered dilute systems of one or two colloids in simple fluids and developed an iterative method to determine memory kernels. In the next funding period, we plan to consider many-particle-effects, include charges, and also consider driven nonequilibrium and active systems. In the new mathematical work-packages we will analyze rigorously the inverse problem of determining appropriate memory kernels for the generalized Langevin equation.

Frequency-dependent hydrodynamic interaction between two solid spheres

Physics of Fluids 29 (12),
126101
(2017);

doi:10.1063/1.5001565

Iterative Reconstruction of Memory Kernels

Journal of Chemical Theory and Computation 13 (6),
2481-2488
(2017);

doi:10.1021/acs.jctc.7b00274

Computing bulk and shear viscosities from simulations of fluids with dissipative and stochastic interactions

The Journal of Chemical Physics 144 (20),
204104
(2016);

doi:10.1063/1.4950760

Flows and mixing in channels with misaligned superhydrophobic walls

Physical Review E 91 (3),
(2015);

doi:10.1103/physreve.91.033020

## Contact

- Prof. Dr. Martin Hanke-Bourgeois
- Institut für Mathematik
- Universität Mainz
- Staudingerweg 9
- D-55128 Mainz
- Tel: +49 6131 39 22528
- Fax: +49 6131 39 23331
- hanket@pWktmathematik.uni-mainz.de
- http://www.mathematik.uni-mainz.de/Members/hanke

- Prof. Dr. Friederike Schmid
- Institut für Physik
- Universität Mainz
- Staudingerweg 9
- D-55128 Mainz
- Tel: +49 6131 3920365
- Fax: +49 5131 3920496
- Sekr: +49 6131 3920495
- friederike.schmidOorQ@kXsGLaxANfuni-mainz.de
- https://www.komet1.physik.uni-mainz.de/people/friederike-schmid/