Matteo Paoluzzi - IPCF-CNR #
Run-and-Tumble dynamics #
Run-and-tumble is a simple but powerful model that captures many 
properties of motile bacteria. This model is based on the schematization 
of single bacterium dynamics as a sequence of linear runs interrupted by 
random ---Poissonian distributed--- tumbling events. The resulting 
movement is a random walk with a persistence length that marks the 
crossover between a ballistic regime at short scales and a Brownian, 
diffusive regime at longer scales.The free particle dynamics is 
parametrized by the swimming velocity, the tumbling rate and the 
duration of a tumble event. I will discuss theoretically, i. e., 
studying the first-passage times problem in one dimension (L. Angelani, 
R. Di Leonardo, and MP, in preparation), and by means of numerical 
simulations, i. e., embedding the active system into a random energy 
landscape provided by speckle patterns (MP, R. Di Leonardo, and L. 
Angelani, in press), some properties of RT dynamics.