Breakdown of effective temperature, power law interactions, and self-propulsion in a momentum-conserving active fluid.
| Title | Breakdown of effective temperature, power law interactions, and self-propulsion in a momentum-conserving active fluid. |
| Publication Type | Journal Article |
| Year of Publication | 2019 |
| Authors | Vishen ASingh, Prost J, Rao M |
| Journal | Phys Rev E |
| Volume | 100 |
| Issue | 6-1 |
| Pagination | 062602 |
| Date Published | 2019 Dec |
| ISSN | 2470-0053 |
| Abstract | The simplest extensions of single-particle dynamics in a momentum-conserving active fluid-an active suspension of two colloidal particles or a single particle confined by a wall-exhibit strong departures from Boltzmann behavior, resulting in either a breakdown of an effective temperature description or a steady state with nonzero-entropy production rate. This is a consequence of hydrodynamic interactions that introduce multiplicative noise in the stochastic description of particle positions. This results in fluctuation-induced interactions that depend on distance as a power law. We find that the dynamics of activated colloids in a passive fluid, with stochastic forcing localized on the particle, is different from that of passive colloids in an active fluctuating fluid. |
| DOI | 10.1103/PhysRevE.100.062602 |
| Alternate Journal | Phys Rev E |
| PubMed ID | 31962504 |