Angular momenta creation in relativistic electron-positron plasma
  Creation of angular momentum in a relativistic electron-positron plasma is explored. It is shown that a chain of angular momentum carrying vortices is a robust asymptotic state sustained by the generalized nonlinear Schrodinger equation characteristic to the system. The results may suggest a possible electromagnetic origin of angular momenta when it is applied to the MeV epoch of the early Universe. 
T. Tatsuno, V. I. Berezhiani, M. Pekker, S. M. Mahajan