Institute for Problems in Mechanics, Russian
Academy of Sciences,
101, bild.1 Vernadskii Ave., Moscow, 117526, Russia.
e-mail: rylov@ipmnet.ru
Dynamics of the tachyon gas is considered. It is
interesting in the relation, that dark matter phenomenon is explained freely by
existence of the tachyon gas. Tachyons have two unexpected properties: (1) a
single tachyon cannot be detected and (2) the tachyon gas can be detected by
its gravitational field. Although molecules (tachyons) of the tachyon gas moves
with superluninal velocities, the mean motion of these molecules appears to be
less, than the speed of the light. The tachyon gas properties differs from
those of usual gas. The pressure of the tachyon gas is very high. It is not
isotropic and depends on the gravitational potential. As a result the tachyon
gas may form huge halos around galaxies. These halos have very large and almost
constant density. This circumstance can explain the law of star
velocities at the periphery of a galaxy.
Properties of the tachyon gas admit one to consider it as a dark matter.