Stability of hot tachyon gas
Abstract
We consider a tachyon gas that obeys Maxwell-Boltzmann statistics. The sound speed is always subluminal and it tends to the limiting minimum value cs=1/2 in non-relativistic gas (at low temperature), decreasing monotonously with the growth of temperature and attaining ultra-relativistic limit cs=1/% 3 at high temperature. The hot tachyon gas always satisfies the causality.
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