Quantum field aspect of the Unruh problem

It is shown using a both conventional and algebraic approach to quantum fie ld theory that it is impossible to perform quantization on Unruh modes in M inkowski space-time. Such a quantization implies setting a boundary conditi on for the quantum held operator which changes the topological properties a nd symmetry group of space-time and leads to a field theory in two disconne cted left and right Rindler space-times. It means that the "Unruh effect" d oes not exist. (C) 1999 Elsevier Science B.V.