Dark Energy with w>-4/3

Acceleration of the universe might be driven by a continuous elastic medium – elastic dark energy (Bucher and Spergel 1999). Elastic dark energy can stably support equations of state with pressure to energy ratio w > -4/3. Stable expansion with w<-1 combined with an assumption of ``reheating of elastic energy’’ leads to exotic possibilities such as Expanding Cyclic Universe – an ever-expanding universe with periodically repeating inflationary epochs.