Dark Energy and Dark Matter from Extra Dimensional Symmetry as Different Manifestations of Vacuum Energy

Dark energy and dark matter are described as different manifestations of vacuum energy in the framework of Extra Dimensional Symmetry (EDS). Motivated by the cosmological constant problem and dark matter observations, symmetry requirements in EDS doubles large spatial dimensions with microscopic partners of opposite handedness, dimension number and response to the stress energy tensor. Vacuum energy is constrained in a gravitationally inert state where actual gravitational constant is zero G in contrast with the gravitationally active state where actual gravitational constant is two Gs, with each of these two states corresponding to opposite particle chirality. A small component of vacuum energy, constrained to the active state by a Planck density constraint and an asymptotically evolving asymmetry appears as a repulsive but dynamical dark energy component that varies in space and time. Dark matter is described as the attractive component of vacuum energy, enabled by neutrino induced gravitational constant which also serves as neutrino mass generation mechanism. While ordinary neutrino interaction with dark energy yields light neutrino mass, chiraly inverted neutrino interaction with dense vacuum energy component yields heavy neutrino mass. Transition to heavy neutrino phase can be activated by shear stress. Properties, observational and experimental tests are briefly discussed.