Dear Sir,
Everybody is talking about it. But is not dark energy an oxymoron? Energy is only indirectly perceived through its interactions. Only because it is smooth and persistent and non-interacting, it cannot be called dark energy. If it interacts with others to be perceivable, it cannot be dark. If it does not interact, it cannot be energy. Its characteristic resembles a background structure. In this connection kindly note that:
Transverse waves are always characterized by particle motion being perpendicular to the wave motion. This implies the existence of a medium through which the reference wave travels and with respect to which the transverse wave travels in a perpendicular direction. In the absence of the reference wave, which is a longitudinal wave, the transverse wave can not be characterized as such. All transverse waves are background invariant by its very definition. Since light is propagated in transverse waves, Maxwell used a transverse wave and aether fluid model for his equations. Feynman has shown that Lorentz transformation and invariance of speed of light follows from Maxwell's equations. Einstein's causal analysis in SR is based on Lorentz's motional theory where a propagation medium is essential to solve the wave equation. Einstein's ether-less relativity is not supported by Maxwell's Equations nor the Lorentz Transformations, both of which are medium (aether) based. Thus, the non-observance of aether drag (as observed in Michelson-Morley experiments) cannot serve to ultimately disprove the aether model. The equations describing spacetime, based on Einstein's theories of relativity, are mathematically identical to the equations describing ordinary fluid and solid systems. Yet, it is paradoxical that physicists have denied aether model while using the formalism derived from it. They don't realize that Maxwell used transverse wave model, whereas aether drag considers longitudinal waves. Thus, the notion that Einstein's work is based on "aether-less model" is a myth. All along he used the aether model, while claiming the very opposite.
Further, only energy (potential/internal or kinetic/external) makes matter interact. By itself, matter is not interacting - hence dark. Matter has the characteristic of accumulation around a point - as is supposed to be in a black hole. Energy flows from higher concentration to lower concentration carrying information and leading to perception.
Regards,
basudeba