Diffusing wave paradox of phototactic particles in traveling light pulses
Despite lacking a brain, living amoebae are amazingly effective organisms when navigating through complex environments, solving maze problems or even mimicking the layout of man-made transportation networks. Another intruiging property is their ability, to move counter to the direction of chemical pulses, typically referred to as diffusing wave paradox. To achieve such motion, the presence of adaptation and memory in such organisms has been suggested. In our work, we demonstrate, that even for particles which strictly locally respond to their surrounding, a counter-propagation to a running pulse is possible. In view of future applications of microswimmers as autonomous microrobots, it will be important to coordinate and synchronize their behavior. The diffusing wave paradox can play an important role in this context.