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- W2000331036 abstract "Self-propelled particle (SPP) systems are intrinsically out of equilibrium systems, where each individual particle converts energy into work to move in a dissipative medium. When interacting through a velocity alignment mechanism, and with the medium acting as a momentum sink, even momentum is not conserved. In this scenario, a mapping into an equilibrium system seems unlikely. Here, we show that an entropy functional can be derived for SPPs with velocity alignment and density-dependent speed, at least in the (orientationally) disordered phase. This non-trivial result has important physical consequences. The study of the entropy functional reveals that the system can undergo phase separation before the orientational-order phase transition known to occur in SPP systems with velocity alignment. Moreover, we indicate that the spinodal line is a function of the alignment sensitivity and show that density fluctuations as well as the critical spatial diffusion, that leads to phase separation, dramatically increase as the orientational-order transition is approached." @default.
- W2000331036 created "2016-06-24" @default.
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- W2000331036 date "2014-05-15" @default.
- W2000331036 modified "2023-09-25" @default.
- W2000331036 title "Motility-Induced Phase Separation of Active Particles in the Presence of Velocity Alignment" @default.
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- W2000331036 doi "https://doi.org/10.1007/s10955-014-1008-9" @default.
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