Acoustics of tachyon Fermi gas

الأصل · EN

We consider a Fermi gas of free tachyons as a continuous medium and find whether it satisfies the causality condition. There is no stable tachyon matter with the particle density below critical value nₜ and the Fermi momentum kF<√ 32m that depends on the tachyon mass m. The pressure P and energy density E cannot be arbitrary small, but the situation P>E is not forbidden. Existence of shock waves in tachyon gas is also discussed. At low density nₜ<n<3.45nₜ the tachyon matter remains stable but no shock wave do survive.