Traveling Band Solutions in a System Modeling Hunting Cooperation

A classical Lotka-Volterra model with the logistical growth of prey-and-hunting coopera- tion in the functional response of predators to prey was extended by introducing advection terms, which included the velocities of animals. The effect of velocity on the kinetics of the problem was analyzed. In order to examine the band behavior of species over time, traveling wave solutions were introduced, and conditions for the coexistence of both populations and/or extinction were found. Numerical simulations illustrating the obtained results were performe

Hydrodynamic effects on the liquid-hexatic transition of active colloids

We study numerically the role of hydrodynamics in the liquid-hexatic transition of active colloids at intermediate activity, where motility induced phase separation (MIPS) does not occur. We show that in the case of active Brownian particles (ABP), the critical density of the transition decreases upon increasing the particle's mass, enhancing ordering, while self-propulsion has the opposite effect in the activity regime considered.

Random Walk in Physics

Abbiamo oggi una pletora di libri molto popolari su argomenti come i buchi neri, i viaggi nel tempo, le onde gravitazionali, il Big Bang, il bosone di Higgs, il multiverso. Questo libro segue un’altra strada, e si propone di dare una spiegazione informale e semplice di alcune delle idee della fisica e della matematica moderne che, nonostante la loro importanza concettuale e pratica, non sono trattate nei libri più popolari.