On the evolution of linear waves in cosmological plasmas

Details On the evolution of linear waves in cosmological plasmas On the evolution of linear waves in cosmological plasmas

Aug 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010phrvd..82d4044d&link_type=abstract

Physical Review D, vol. 82, Issue 4, id. 044044

Mathematics

Logic

8

Einstein-Maxwell Spacetimes, Spacetimes With Fluids, Radiation Or Classical Fields, Waves, Oscillations, And Instabilities In Plasmas And Intense Beams, Magnetohydrodynamics And Plasmas, Mathematical And Relativistic Aspects Of Cosmology

Scientific paper

The scalings for basic plasma modes in the Friedmann-Robertson-Walker model of the expanding Universe are revised. Contrary to the existing literature, the wave collisionless evolution must comply with the action conservation theorem. The proper steps to deduce the action conservation from ab initio analytical calculations are presented, and discrepancies in the earlier papers are identified. In general, the cosmological wave evolution is more easily derived from the action conservation in the collisionless limit, whereas when collisions are essential, the statistical description must suffice, thereby ruling out the need for using dynamic equations in either case.

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