  In this paper we consider relativistic effects of rotation in the
magnetospheres of $\gamma$-ray pulsars. The paper reviews the progress achieved
in this field during the last three decades. For this purpose we examine direct
centrifugal acceleration of particles and corresponding limiting factors:
constraints due to the curvature radiation and the inverse Compton scattering
of electrons against soft photons. Based on the obtained results generation of
parametrically excited Langmuir waves and the corresponding
Landau-Langmuir-centrifugal drive is studied.
