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The confined, quasi-two-dimensional guiding center plasma and a system ofinteracting line vortices in an ideal fluid are examples of Hamiltonian systemswith infinite interaction distances. The existence of metastable states withnegative specific is investigated by standard entropy maximization of thethermodynamic limit of vortices as they become infinitesimal and form acontinuous field. We find metastable states and suggest that these imply arunaway reaction leading to a rapid expansion of a confined plasma or fluidsimilar to the rapid collapse of globular clusters in astrophysics.

Runaway expansion in confined quasi-2D plasmas and vortex fluids