2026/02/26 by Anonymous, Venkata D. Pamulaparthy, Rosemary J. Harris
Physics and Astronomy · #Micro and Nano Robotics #stochastic dynamics and bifurcation #Advanced Thermodynamics and Statistical Mechanics
paper · pdf · doi:10.1103/7w8f-5l87
We analyse a continuous-time random walk model with stochastic reversals of direction. There is no external potential but the reorientation mechanism generates a non-zero current from asymmetry in the forward and backward waiting-time distributions (even when they have the same mean); the system can therefore be considered as a type of active particle ratchet. We derive an explicit expression for the mean ratchet current with exponentially distributed reorientation times and also develop a general renewal-theory framework to obtain the full large deviations, using this to comment on the possibility of dynamical phase transitions.