Tootfinder

Motility-dependent selective transport of active matter in trap arrays: Separation methods based on trapping-detrapping and deterministic lateral displacement
Vyacheslav R. Misko, Franco Nori, Wim De Malsche
https://arxiv.org/abs/2505.23882

Motility-dependent selective transport of active matter in trap arrays: Separation methods based on trapping-detrapping and deterministic lateral displacement
Selecting active matter based on its motility represents a challenging task, as it requires different approaches than common separation techniques intended for separation based on, e.g., size, shape, density, and flexibility. This motility-based selection is important for, e.g., selecting biological species, such as bacteria or highly motile sperm cells for medically assisted reproduction. Common separation techniques are not applicable for separating species based on motility as such species c…

A reentrancy of motility-induced phase separation in overdamped active Brownian particles
Hiroya Yamamoto
https://arxiv.org/abs/2507.01553 https://

A reentrancy of motility-induced phase separation in overdamped active Brownian particles
In a system of Self-Propelled Particles (SPPs), the combination of self-propulsion and excluded volume effects can result in a phase separation called Motility-Induced Phase Separation (MIPS). Previous studies reported that MIPS is one of the phenomena so-called "reentrant phase separation" ,i.e., MIPS is suppressed when the Péclet number $Pe$ (dimensionless self-propelled speed) is sufficiently large. We used a fundamental model of SPPs, i.e., overdamped Active Brownian Partcles (ABPs), to in…

Stochastic motility energetics reveals cooperative bacterial swarming in optical tweezers
Clara Luque-Rioja, Horacio L\'opez-Men\'endez, Macarena Calero, Niccol\'o Caselli, Diego Herr\'aez-Aguilar, Juan P. G. Villaluenga, Francisco Monroy
https://arxiv.org/abs/2506.14573 …

Stochastic motility energetics reveals cooperative bacterial swarming in optical tweezers
Bacterial flagellar swarming enables dense microbial populations to migrate collectively across surfaces, often resulting in emergent, coordinated behaviors. However, probing the underlying energetics of swarming at the single cluster level remains a challenge. Here, we combine optical tweezers and multiparticle tracking within a stochastic thermodynamic framework to characterize the active motility of confined Proteus mirabilis clusters. Using the Photon Momentum Method to directly measure tra…

Geometric and Nonequilibrium Criticality in Run-and-Tumble Particles with Competing Motility and Attraction
Abir Bhowmick, Sayantan Mitra, P. K. Mohanty
https://arxiv.org/abs/2506.05264

Geometric and Nonequilibrium Criticality in Run-and-Tumble Particles with Competing Motility and Attraction
Self-propulsion in run-and-tumble particles (RTPs) generates effective attractive interactions that can drive motility-induced phase separation (MIPS), a phenomenon absent in their passive counterparts. In this work, we show that at high motility, introducing explicit attractive interactions among RTPs can suppress MIPS, leading to a homogeneous phase, and subsequently induce a re-emergence of phase separation at stronger attraction --thus realizing a reentrant phase transition. We characterize…

This https://arxiv.org/abs/2504.07446 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_nli…

A mass conserved reaction-diffusion system reveals switching between coexisting polar and oscillatory cell motility states
Motile eukaryotic cells display distinct modes of migration that often occur within the same cell type. It remains unclear, however, whether transitions between the migratory modes require changes in external conditions, or whether the different modes are coexisting states that emerge from the underlying signaling network. Using a simplified mass-conserved reaction-diffusion model of small GTPase signaling with F-actin mediated feedback, we uncover a distinct bistable mechanism (involving gradi…

This https://arxiv.org/abs/2408.09763 has been replaced.
initial toot: https://mastoxiv.page/@arXi…

Effect of the background flow on the motility induced phase separation
We simulate active Brownian particles (ABPs) with soft-repulsive interactions subjected to a four-roll-mill flow. In the absence of flow, this system exhibits motility-induced phase separation (MIPS). To investigate the interplay between MIPS and flow-induced mixing, we introduce dimensionless parameters: a scaled time, $τ$, and a scaled velocity, ${\rm v}$, characterizing the ratio of ABP to fluid time and velocity scales, respectively. The parameter space defined by $τ$ and ${\rm v}$ reveal…

Contact temporal network during motility induced phase separation
Italo Salas, Francisca Guzm\'an-Lastra, Denisse Past\'en, Ariel Norambuena
https://arxiv.org/abs/2506.08642

Contact temporal network during motility induced phase separation
Motility-induced phase separation (MIPS) is a paradigmatic non-equilibrium transition in active matter, determined by the Péclet number and packing fraction. We investigate the single-phase and phase-separated regimes of MIPS using a complex network approach, where networks are constructed from particle interactions over finite time windows. In the single-phase (gas-like) regime, the degree distributions $P(k)$ exhibit Gaussian behavior and resemble those of random graphs. Plotting the locatio…

Symmetry-breaking motility of an active hinge in a crowded channel
Leonardo Garibaldi Rigon, Yongjoo Baek
https://arxiv.org/abs/2506.16722 https://

Symmetry-breaking motility of an active hinge in a crowded channel
A recent experiment [Son et al., Soft Matter, 2024, 20,2777-2788] showed that self-propelled particles confined within a circular boundary filled with granular medium spontaneously form a motile cluster that stays on the boundary. This cluster exhibits persistent (counter)clockwise motion driven by symmetry breaking, which arises from a positive feedback between the asymmetry of the cluster and those of the surrounding granular medium. To investigate this symmetry-breaking mechanism in broader …

Density-Independent Glassy Behavior in the High-Density Phase of Motility-Induced Phase Separation
Toranosuke Umemura, Issei Sakai, Takuma Akimoto
https://arxiv.org/abs/2506.13140

Density-Independent Glassy Behavior in the High-Density Phase of Motility-Induced Phase Separation
We investigate the nonequilibrium dynamics of active matter using a two-dimensional active Brownian particles model. In these systems, self-propelled particles undergo motility-induced phase separation (MIPS), spontaneously segregating into dense and dilute phases. We find that in the high-density phase, local particle mobility exhibits glassy behavior, with diffusivity remaining unchanged despite variations in the global system density. As global density increases further, the system undergoes…

Towards a two-scale model for morphogenesis -- How cellular processes influence tissue deformations
Lea Happel, Axel Voigt
https://arxiv.org/abs/2506.19475

Towards a two-scale model for morphogenesis -- How cellular processes influence tissue deformations
We propose a two-scale model to resolve essential features of developmental tissue deformations. The model couples individual cellular behavior to the mechanics at tissue scale. This is realized by a multiphase-field model addressing the motility, deformability and interaction of cells on an evolving surface. The surface evolution is due to bending elasticity, with bending properties influenced by the topology of the cellular network, which forms the surface. We discuss and motivate model assum…

From toroids to helical tubules: Kirigami-inspired programmable assembly of two-periodic curved crystals
Mason Price, Daichi Hayakawa, Thomas E. Videb{\ae}k, Rupam Saha, Botond Tyukodi, Michael F. Hagan, Seth Fraden, Gregory M. Grason, W. Benjamin Rogers
https://arxiv.org/abs/2506.16403 …

From toroids to helical tubules: Kirigami-inspired programmable assembly of two-periodic curved crystals
Biology is full of intricate molecular structures whose geometries are inextricably linked to their function. Many of these structures exhibit varying curvature, such as the helical structure of the bacterial flagellum, which is critical for their motility. Because synthetic analogues of these shapes could be valuable platforms for nanotechnologies, including drug delivery and plasmonics, controllable synthesis of variable-curvature structures of various material systems, from fullerenes to sup…

Phase separation in a mixture of proliferating and motile active matter
Lukas Hupe, Joanna M. Materska, David Zwicker, Ramin Golestanian, Bartlomiej Waclaw, Philip Bittihn
https://arxiv.org/abs/2506.05288

Phase separation in a mixture of proliferating and motile active matter
Proliferation and motility are ubiquitous drivers of activity in biological systems. Here, we study a dense binary mixture of motile and proliferating particles with exclusively repulsive interactions, where homeostasis in the proliferating subpopulation is maintained by pressure-induced removal. Using computer simulations, we show that phase separation emerges naturally in this system at high density and weak enough self-propulsion. We show that condensation is caused by interactions between m…