| 06/2023 Dynamical pattern formation without self-attraction in quorum-sensing active matter: the interplay between nonreciprocity and motility Yu Duan et al. We study a minimal model involving two species of particles interacting via quorum-sensing rules. Combining simulations of the microscopic model and linear stability analysis of the associated coarse-grained field theory, we identify a mechanism for dynamical pattern formation that does not rely on the standard route of intra-species effective attractive interactions. Instead, our results reveal a … |
| 06/2023 Influence of physical interactions on spatiotemporal patterns Chengjie Luo et al. Spatiotemporal patterns are often modeled using reaction-diffusion equations, which combine complex reactions between constituents with ideal diffusive motion. Such descriptions neglect physical interactions between constituents, which might affect resulting patterns. To overcome this, we study how physical interactions affect cyclic dominant reactions, like the seminal rock-paper-scissors game, w … |
| 06/2023 Defect Solutions of the Non-reciprocal Cahn-Hilliard Model: Spirals and Targets Navdeep Rana et al. We study the defect solutions of the Non-reciprocal Cahn-Hilliard model (NRCH). We find two kinds of defects, spirals with unit magnitude topological charge, and topologically neutral targets. These defects generate radially outward travelling waves and thus break the parity and time-reversal symmetry. For a given strength of non-reciprocity, spirals and targets with unique asymptotic wavenumber a … |
| 06/2023 Infomorphic networks: Locally learning neural networks derived from partial information decomposition Marcel Graetz et al. Understanding the intricate cooperation among individual neurons in performing complex tasks remains a challenge to this date. In this paper, we propose a novel type of model neuron that emulates the functional characteristics of biological neurons by optimizing an abstract local information processing goal. We have previously formulated such a goal function based on principles from partial inform … |
| 05/2023 Lorentz Reciprocal Theorem in Fluids with Odd Viscosity Yuto Hosaka et al. The Lorentz reciprocal theorem — that is used to study various transport phenomena in hydrodynamics — is violated in chiral active fluids that feature odd viscosity with broken time-reversal and parity symmetries. Here we show that the theorem can be generalized to fluids with odd viscosity by choosing an auxiliary problem with the opposite sign of the odd viscosity. We demonstrate the applicati … |
| 05/2023 Signatures of hierarchical temporal processing in the mouse visual system Lucas Rudelt et al. A core challenge for information processing in the brain is to integrate information across various timescales. This could be achieved by a hierarchical organization of temporal processing, as reported for primates; however, it is open whether this hierarchical organization generalizes to sensory processing across species. Here, we studied signatures of temporal processing along the anatomical hie … |
| 05/2023 Societal feedback induces complex and chaotic dynamics in endemic infectious diseases Joel Wagner et al. Classically, endemic diseases are expected to display relatively stable, predictable infection dynamics. Indeed, diseases like influenza show yearly recurring infection waves that can be anticipated accurately enough to develop and distribute new vaccines. In contrast, newly-emerging diseases may cause more complex, unpredictable dynamics, like COVID-19 has demonstrated. Here we show that complex … |
| 05/2023 Axisymmetric monopole and dipole flow singularities in proximity of a stationary no-slip plate immersed in a Brinkman fluid Abdallah Daddi-Moussa-Ider et al. Green's function plays an important role in many areas of physical sciences and is a prime tool for solving diverse hydrodynamic equations in the linear regime. In the present contribution, the axisymmetric low-Reynolds-number Brinkman flow induced by monopole and dipole singularities in proximity of a stationary plate of circular shape is theoretically investigated. The flow singularities ar … |
| 05/2023 Interaction-motif-based classification of self-organizing metabolic cycles Vincent Ouazan-Reboul et al. Particles that are catalytically-active and chemotactic can interact through the concentration fields upon which they act, which in turn may lead to wide-scale spatial self-organization. When these active particles interact through several fields, these interactions gain an additional structure, which can result in new forms of collective behaviour. Here, we study a mixture of active species which … |
| 05/2023 Nonreciprocal interactions give rise to fast cilium synchronisation in finite systems David J. Hickey et al. Motile cilia beat in an asymmetric fashion in order to propel the surrounding fluid. When many cilia are located on a surface, their beating can synchronise such that their phases form metachronal waves. Here, we computationally study a model where each cilium is represented as a spherical particle, moving along a tilted trajectory with a position-dependent active driving force and a position-depe … |