A generically observed mechanism that drives the self-organization of living systems is interaction via chemical signals among the individual elements-which may represent cells, bacteria, or even enzymes. Here we propose an unconventional mechanism for such interactions, in the context of chemotaxis, which originates from the polarity of the particles and which generalizes the well-known Keller-Segel interaction term. We study the resulting large-scale dynamical properties of a system of such chemotactic particles using the exact stochastic formulation of Dean and Kawasaki along with dynamical renormalization group analysis of the critical state of the system. At this critical point, an emergent "Galilean" symmetry is identified, which allows us to obtain the dynamical scaling exponents exactly. These exponents reveal superdiffusive density fluctuations and non-Poissonian number fluctuations. We expect our results to shed light on how molecular regulation of chemotactic circuits can determine large-scale behavior of cell colonies and tissues.
Nonequilibrium polarity-induced chemotaxis: Emergent Galilean symmetry and exact scaling exponents / Mahdisoltani, Saeed; Ben Alì Zinati, Riccardo; Duclut, Charlie; Gambassi, Andrea; Golestanian, Ramin. - In: PHYSICAL REVIEW RESEARCH. - ISSN 2643-1564. - 3:1(2021), pp. 1-22. [10.1103/PhysRevResearch.3.013100]
Nonequilibrium polarity-induced chemotaxis: Emergent Galilean symmetry and exact scaling exponents
Charlie Duclut;Andrea Gambassi;
2021-01-01
Abstract
A generically observed mechanism that drives the self-organization of living systems is interaction via chemical signals among the individual elements-which may represent cells, bacteria, or even enzymes. Here we propose an unconventional mechanism for such interactions, in the context of chemotaxis, which originates from the polarity of the particles and which generalizes the well-known Keller-Segel interaction term. We study the resulting large-scale dynamical properties of a system of such chemotactic particles using the exact stochastic formulation of Dean and Kawasaki along with dynamical renormalization group analysis of the critical state of the system. At this critical point, an emergent "Galilean" symmetry is identified, which allows us to obtain the dynamical scaling exponents exactly. These exponents reveal superdiffusive density fluctuations and non-Poissonian number fluctuations. We expect our results to shed light on how molecular regulation of chemotactic circuits can determine large-scale behavior of cell colonies and tissues.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.