Dark-Energy-Matter from Vacuum owing to the General Covariance Violation

Abstract

It seems that the violation of covariance relatively general coordinate transformations exists in the real world and contributes to its fundamental structure. This guess allows omitting the main part of the vacuum energy reasonably and considering a remaining part emergent from the zero-point fluctuations of the quantum fields as some "fluid" possessing energy density and pressure. Then, the equation of vacuum state and the speed of vacuum sound-waves result from the zero vacuum entropy assumption. Generally, a vacuum can be considered as a "basis" for dark-energy-matter unification. The resulting evolution of the background space-time metric resembles that of the Milne-like universe, but with the late accelerating stage.