Effective equation of state and energy conditions in phantom/tachyon inflationary cosmology perturbed by quantum effects
Abstract
We discuss the model consisting of tachyon which may have the negative kinetic energy plus scalar phantom and plus conformal quantum matter. It is demonstrated that such a model naturally admits two de Sitter phases where the early universe inflation is produced by quantum effects and the late time accelerating universe is caused by phantom/tachyon. The energy conditions bounds for such cosmology are derived. It is interesting that effective equation of state may change its sign what depends from the proper choice of the combination of phantom/tachyon and quantum effects.
 Publication:

Physics Letters B
 Pub Date:
 October 2003
 DOI:
 10.1016/j.physletb.2003.08.013
 arXiv:
 arXiv:hepth/0306212
 Bibcode:
 2003PhLB..571....1N
 Keywords:

 High Energy Physics  Theory;
 Astrophysics;
 High Energy Physics  Phenomenology
 EPrint:
 LaTeX file 14 pages, references are added