Tachyonic fields in cosmology

Abstract

The possibility of explanation of accelerated expansion of the Universe by tachyonic scalar fields which homogeneously fill the world is discussed. The dependences of potential and kinetic term on scale factor are deduced for the case of quintessential and phantom dark energy with generalized linear barotropic equation of state. The possibility to distinguish the tachyonic scalar field as dark energy from other scalar field models, especially from classical scalar field, is analyzed.Comment: 12 pages (v1,v2 in Ukrainian, v3 in English), 4 figures; accepted for publication in Collected Physical Papers of Shevchenko Scientific Societ