Energy in form of space may solve the dark energy problem

rd of the critical value), accelerating and flat. This implies the existence of a cosmic Dark Energy that overcomes the gravitational self-attraction force of matter and causes the accelerating expansion. Finding out the cause of expansion and acceleration of the universe is a challenging job in present day cosmology. Cosmological models with different types of dark energy are becoming viable standard models to analyze and simulate experimental data from a number of high red shift supernovae. In this article, physical significance and analytical expression for dark energy related to total energy (or energy density) and matter (or matter density) in the universe is presented. It is assumed that 'space' or 'vacuum' is another form of energy (other form is mass which is related as E = mc 2 ). With this assumption new cosmological equation of state is constructed which is in very good agreement with present observations. Thus energy evolves from matter to radiation to space. It is also predicted that the existence of a fundamental particle with mass less than the mass of a quark is possible.