Abstract
This paper proposes the hypothesis that cosmic vacuum is full of energy basic state field (EBSF), and expounds its physical connotation based on cosmological constant of general relativity and Dirac’s negative energy sea. Cosmic vacuum is a special kind of physical object with complexity that can be characterized by quantum super-fluidity; it forms Dark energy in Universe. The rationality and correctness of this hypothesis are demonstrated through the analysis in terms of energy basic distribution on the background of cosmic scale and energy scale, quantum vacuum field, the evolution of EBSF state into static quantum’s state (particles or quasiparticle) and so on. Also it estimates the vacuum energy value in the energy basic state field to the same order of energy as the energy value for driving the accelerated expansion of the universe.
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