Abstract:Abstract. We study in this work the phase transition behaviour of animal groups. We assume that the individuals in the group have two classes of state. One is the internal state which can be either excited or non-excited. The other one is characterized by their orientation or direction of motion, it is so called the external state. The internal state plays an important role in the rules of interaction between the individuals. The system is put under a source of external perturbation called "noise", the individ… Show more
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