Group dynamics of robots without sensing devices

High performance in various tasks by robots that move to cooperate is expected. In working with group robots, reduction in cost is also required. Usually, for sensors with high fidelity to organize robots in group, we pay high price. To avoid this we propose a scheme of group robotics without sensing devices. Our robots cannot see, hear, smell and taste. Their motion has no aim. They only can touch in a sense that they recognize each other when they collide. Also they work, in a task of transporting an object to other place, by colliding the object. Power distribution of robots over plane region is represented by temperature parameter of canonical ensemble. We have calculated a force on a circular object acted by robots that move aimlessly. When robots without sensor work by only colliding the object, these robots are seen as cooperative and to have group intelligence. Such scheme allows control system with low cost. We developed a method to calculate force in a power series of velocity of the object. We clarified that the object mobility increases when robot mass decreases. In simulation studies, we also gave a result based on many body dynamics.