We investigate transverse electromagnetic waves propagating in a plasma in the de Sitter space. Using the 3 + 1 formalism we derive the relativistic two-fluid equations to take account of the effects due to the horizon and describe the set of simultaneous linear equations for the perturbations. We use a local approximation to investigate the one-dimensional radial propagation of Alfvén and high...

The phase mixing of Alfvén waves in planar twodimensional open magnetic plasma configurations is considered. It is assumed that the characteristic vertical spatial scale of the configuration is much larger than the horizontal scale, and that the latter is of the order of a wavelength. The WKB method is used to derive the governing equation for the wave amplitude, which in appropriate coordinate...

Context. The six known highly dispersed fast radio bursts are attributed to extragalactic radio sources, of unknown origin but extremely energetic. We propose here a new explanation – not requiring an extreme release of energy – involving a body (planet, asteroid, white dwarf) orbiting an extragalactic pulsar. Aims. We investigate a theory of radio waves associated to such pulsar-orbiting bodie...