Nonlinear flute-drift waves in relativistic electron-positron plasmas

A set of two-fluid equations governing the nonlinear dynamics of flute-drif t waves in an inhomogeneous collisionless magnetized relativistic electron- positron plasma in a gravitational field is derived. It is shown that a rig orous description of these waves in a plasma with inhomogeneous density and temperature has to take into account both the magnetic viscosity and the m agnetic field compression (the finite beta effect). It is shown that contra ry to the case of a cold (nonrelativistic) plasma a flute instability can a lso exist in a plasma with a homogeneous density and inhomogeneous temperat ure. Our new equations have solitary solutions in the form of exponentially localized dipolar vortices.