Burgazli, AlvinaEingorn, MaximZhuk, Alexander2013-11-222013-11-22201212-th Odessa International astronomical Gamow conference-school, "Astronomy and beyond: astrophysics, cosmology and gravitation, cosmomicrophysics, radio-astronomy and astrobiology" : program and abstracts, August 20-26, 2012 / "Astronomy and beyond: astrophysics, cosmology and gravitation, cosmomicrophysics, radio-astronomy and astrobiology", international astronomical Gamow conference-school (12;2012; Odessa) - ; chief I. N. Koval . – Odessa, 2012 . – 53 p.https://dspace.onu.edu.ua/handle/123456789/3939We demonstrate that -1/3 is the only admissible negative parameter in the non-vacuum equation of state, determine the corresponding gravitational potentials and discuss their main properties.eninhomogeneitiesquintessence or phantom energyArticle