A rotating quantum vacuum and the depolarization problem in storage rings

We investigate how a uniformly rotating frame is defined as the rest frame of an observer rotating with constant angular velocity Omega around the z a xis of an inertial frame. Assuming that this frame is a Lorentz one, we sec ond quantize a free massless scalar field in this rotating frame and obtain a new rotating vacuum (of a massless scalar field) different from the Mink owski one. After this we consider a monopole detector interacting with the field. The radiative processes are discussed from a rotating and inertial f rame point of view. Finally using this formalism, the polarization effects of electrons in circular accelerators is discussed.