Einstein's equivalence principle and the increasing speed of the expansion of the Universe.

A material object moving at the speed of light travels through the entire Universe at no "time" at all.

Applying Einstein's equivalence principle, this means that from this object's relative point of view the Universe has no space (and time) dimensions at all.

From the moment the speed of this object starts to slow down (due to a Big Bang/Big Collision?), from the relative point of view of that object (the space and time dimensions of) the Universe start to exist and expand.

The more gravity causes this object (all matter in the Universe including us) to slow down, from the relative point of view of this object (that include us) the faster the Universe and space seem to expand.

So from an other relative point of view, it may very well be possible that the speed of expansion of the Universe is not increasing at all, but is rather slowing down.

In this case, no so-called mysterious dark energy is needed at all, because the expansion speed of the Universe only seems to increase from our mere "relative" point of view.