  Analyses of internal galaxy and cluster dynamics typically employ Newton's
law of gravity, which neglects the field self-interaction effects of General
Relativity. This may be why dark matter seems necessary. The Universe
evolution, on the other hand, is treated with the full theory, General
Relativity. However, the approximations of isotropy and homogeneity, normally
used to derive and solve the Universe evolution equations, effectively suppress
General Relativity's field self-interaction effects and this may introduce the
need for dark energy. Calculations have shown that field self-interaction
increases the binding of matter inside massive systems, which may account for
galaxy and cluster dynamics without invoking dark matter. In turn, energy
conservation dictates that the increased binding must be balanced by an
effectively decreased gravitational interaction outside the massive system. In
this article, such suppression is estimated and its consequence for the
Universe's evolution is discussed. Observations are reproduced without need for
dark energy.
