The dynamics of the intergalactic medium

It is assumed that the intergalactic medium contains fully ionized plasmas. A detailed discussion shows that it is necessary to distinguish between medium-density and low-density plasmas before we can carry out any analysis. The conditions are very critical for the conclusions and application of any mechanism one likes to discuss for the intergalactic medium. It is shown that acceleration of high-energy particles in the intergalactic medium is possible.