Abstract
Dynamics of two-sign point vortices in positive and negative temperature states is examined by a special-purpose supercomputer (MDGRAPE-2). Temperature T is determined by random sampling of 10 7 states for microcanonical ensemble in which system energy and angular impulse are kept constant. Distributions of the vortices in time-asymptotic equilibrium state are obtained by time development simulations for various values of T. When T > 0, both-sign vortices mix with each other and neutralize. When T < 0, a part of the vortices condenses and forms the clumps exclusively consisting of the same-sign vortices, while the other part of the vortices distributes outside the clumps uniformly. It is found that the vortices inside the clumps gain energy and the ones outside the clumps lose energy to keep the total energy constant. It suggests the common and essential role of the background vortices in the energy-conserving system that assists the formation of the clumps as well as the crystallization and generation of symmetric configuration observed in the nonneutral plasma experiments.
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