88 citations · 460 across the 22 of their papers we have counts for
22 papers
Topological defects in multi-layered swarming bacteria
Victor Yashunsky, Daniel J. G. Pearce, Gil Ariel +1
Topological defects, which are singular points in a director field, play a major role in shaping active systems. Here, we experimentally study topological defects and the flow patt…
Detecting and characterizing phase transitions in active matter using entropy
Benjamin Sorkin, Avraham Be'er, Haim Diamant +1
A major challenge in the study of active matter lies in quantitative characterization of phases and transitions between them. We show how the entropy of a collection of active obje…
Universal Relation between Entropy and Kinetics
Benjamin Sorkin, Haim Diamant, Gil Ariel
Relating thermodynamic and kinetic properties is a conceptual challenge with many practical benefits. Here, based on first principles, we derive a rigorous inequality relating the…
Pair correlation function based on Voronoi topology
Vasco M. Worlitzer, Gil Ariel, Emanuel A. Lazar
The pair correlation function (PCF) has proven an effective tool for analyzing many physical systems due to its simplicity and its applicability to simulated and experimental data.…
Resolving entropy contributions in nonequilibrium transitions
Benjamin Sorkin, Joshua Ricouvier, Haim Diamant +1
We derive a functional for the entropy contributed by any microscopic degrees of freedom as arising from their measurable pair correlations. Applicable both in and out of equilibri…
Physical characteristics of mixed-species swarming colonies
Ajesh Jose, Gil Ariel, Avraham Be'er
In nature, bacterial collectives typically consist of multiple species, which are interacting both biochemically and physically. Nonetheless, past studies on the physical propertie…
Biophysics underlying the swarm to biofilm transition
Vasco M. Worlitzer, Ajesh Jose, Ilana Grinberg +5
Bacteria organize in a variety of collective states, from swarming, which has been attributed to rapid surface exploration, to biofilms, which are highly dense immobile communities…
Turbulence-induced clustering in compressible active fluids
Vasco M. Worlitzer, Gil Ariel, Avraham Be'er +3
We study a novel phase of active polar fluids, which is characterized by the continuous creation and destruction of dense clusters due to self-sustained turbulence. This state aris…
Self-driven criticality in a stochastic epidemic model
Gil Ariel, Yoram Louzoun
We present a generic epidemic model with stochastic parameters, in which the dynamics self-organize to a critical state with suppressed exponential growth. More precisely, the dyna…
Motility-Induced Clustering and Meso-Scale Turbulence in Active Polar Fluids
Vasco M. Worlitzer, Gil Ariel, Avraham Be'er +3
Meso-scale turbulence was originally observed experimentally in various suspensions of swimming bacteria, as well as in the collective motion of active colloids. The corresponding…
Heterogeneous bacterial swarms with mixed lengths
Shlomit Peled, Shawn D. Ryan, Sebastian Heidenreich +3
Heterogeneous systems of active matter exhibit a range of complex emergent dynamical patterns. In particular, it is difficult to predict the properties of the mixed system based on…
Inferring entropy from structure
Gil Ariel, Haim Diamant
The thermodynamic definition of entropy can be extended to nonequilibrium systems based on its relation to information. To apply this definition in practice requires access to the…
Conservative, Dissipative and Super-diffusive Behavior of a Particle Propelled in a Regular Flow
Gil Ariel, Jeremy Schiff
A recent model of Ariel et al. [1] for explaining the observation of Lévy walks in swarming bacteria suggests that self-propelled, elongated particles in a periodic array of regula…
A phase diagram for bacterial swarming
Avraham Be`er, Bella Ilkanaiv, Renan Gross +4
Bacterial swarming is a rapid mass-migration, in which thousands of cells spread collectively to colonize a surface. Physically, swarming is a natural example of active particles t…
Estimating differential entropy using recursive copula splitting
Gil Ariel, Yoram Louzoun
A method for estimating the Shannon differential entropy of multidimensional random variables using independent samples is described. The method is based on decomposing the distrib…
θ-parareal schemes
Gil Ariel, Hieu Nguyen, Richard Tsai
A weighted version of the parareal method for parallel-in-time computation of time dependent problems is presented. Linear stability analysis for a scalar weighing strategy shows t…
Parareal methods for highly oscillatory dynamical systems
Gil Ariel, Seong Jun Kim, Richard Tsai
We introduce a new strategy for coupling the parallel in time (parareal) iterative methodology with multiscale integrators. Following the parareal framework, the algorithm computes…
Competition between condensation of monovalent and multivalent ions in DNA aggregation
Yoram Burak, Gil Ariel, David Andelman
We discuss the distribution of ions around highly charged PEs when there is competition between monovalent and multivalent ions, pointing out that in this case the number of conden…
Onset of DNA Aggregation in Presence of Monovalent and Multivalent Counterions
Y. Burak, G. Ariel, D. Andelman
We address theoretically aggregation of DNA segments by multivalent polyamines such as spermine and spermidine. In experiments, the aggregation occurs above a certain threshold con…
The Persistence Length of a Strongly Charged, Rod-like, Polyelectrolyte in the Presence of Salt
Gil Ariel, David Andelman
The persistence length of a single, intrinsically rigid polyelectrolyte chain, above the Manning condensation threshold is investigated theoretically in presence of added salt. Usi…
Polyelectrolyte Persistence Length: Attractive Effect of Counterion Correlations and Fluctuations
Gil Ariel, David Andelman
The persistence length of a single, strongly charged, stiff polyelectrolyte chain is investigated theoretically. Path integral formulation is used to obtain the effective electrost…
Kinetics of Surfactant Adsorption: The Free Energy Approach
H. Diamant, G. Ariel, D. Andelman
We review the free energy approach to the kinetics of surfactant adsorption at fluid/fluid interfaces. The formalism is applied to several systems. For non-ionic surfactant solutio…