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Articles by Raphael Wittkowski
Condensed Matter > Soft Condensed Matter
[Submitted on 18 Oct 2026] Title:Dependence of the acoustic propulsion of nano- and microcones on their orientation and aspect ratio View a PDF of the paper titled Dependence of the acoustic propulsion of nano- and microcones on their orientation and aspect ratio, by Johannes Vo\ss{} and 1 other authors View PDF HTML (experimental) Abstract:Recent research revealed the orientation-dependent propulsion of a cone-shaped colloidal particle that is exposed to a planar traveling ultrasound wave.
[2512.13912] Intelligent matter consisting of active particles
[Submitted on 15 Dec 2025] Title:Intelligent matter consisting of active particles View a PDF of the paper titled Intelligent matter consisting of active particles, by Julian Jeggle and 1 other authors View PDF HTML (experimental) Abstract:In this book chapter, we review how systems of simple motile agents can be used as a pathway to intelligent systems.
Acoustic neural networks: Identifying design principles and exploring physical feasibility
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3D multiscale shape analysis of nuclei and in-vivo elastic stress sensors allows force inference
1Third Institute of Physics-Biophysics, University of Göttingen, Göttingen, Germany 2Cluster of Excellence Multiscale Bioimaging: from Molecular Machines to Networks of Excitable Cells (MBExC), University of Göttingen, Göttingen, Germany 3Institute of Pharmacology and Toxicology, University Medical Center Göttingen, Göttingen, Germany 4Max-Planck-Institute for Dynamics and Self-Organization, Göttingen, Germany 5Institute of Theoretical Physics, Center for Soft Nanoscience, University of...
Metareview: a survey of active matter reviews
Eur. Phys. J.
Collective dynamics and pair-distribution function of active Brownian ellipsoids in two spatial dimensions - Communications Physics
Abstract While the collective dynamics of spherical active Brownian particles is relatively well understood by now, the much more complex dynamics of nonspherical active particles still raises interesting open questions. Previous work has shown that the dynamics of rod-like or ellipsoidal active particles can differ significantly from that of spherical ones.
Inertial self-propelled particles in anisotropic environments - Communications Physics
Abstract Self-propelled particles in anisotropic environments can exhibit a motility that depends on their orientation. This dependence is relevant for a plethora of living organisms but difficult to study in controlled environments. Here, we present a macroscopic system of self-propelled vibrated granular particles on a striated substrate that displays orientation-dependent motility.
Pair-distribution function of active Brownian spheres in three spatial dimensions: simulation results and analytical representation
Pair-distribution function of active Brownian spheres in three spatial dimensions: simulation results and analytical representation The pair-distribution function, which provides information about correlations in a system of interacting particles, is one of the key objects of theoretical soft matter physics. In particular, it allows for microscopic insights into the phase behavior of active particles.
[2307.00437] Passive and active field theories for disease spreading
The worldwide COVID-19 pandemic has led to a significant growth of interest in the development of mathematical models that allow to describe effects such as social distancing measures, the development of vaccines, and mutations. Several of these models are based on concepts from soft matter theory.
An Acoustically Controlled Microrobot Modelled on Spirochete Bacteria
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Mori-Zwanzig Formalism for General Relativity: A New Approach to the Averaging Problem
Abstract Cosmology relies on a coarse-grained description of the universe, assumed to be valid on large length scales. However, the nonlinearity of general relativity makes coarse graining extremely difficult. We here address this problem by extending the Mori-Zwanzig projection operator formalism, a highly successful coarse-graining method from statistical mechanics, towards general relativity.
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