[baudrunner]

Interesting graphical representation of a mathematical formula doesn't make it so. Reality is not a reflection or representation of mathematical formulae. Einstein once proved a static Universe by tinkering with his own relativity equations, but admitted later that in reality this was not the case even though the math was correct.

Dark matter may be no more than that which occupies our horizon in a fantastically collossal Universe wherein which we might occupy just a dimple because anything of this sheer size cannot maintain the integrity of a presumed shape, which is necessary in your equations. Light from the distant matter in that horizon might never reach us in the entire history of humankind, yet the effects of the gravity of matter occupying it would still exist and be evident in observations of what we can see, and that horizon might very well be wrapping us so that it occupies most of our field of view. Dark matter might not be dark at all, just too far away for us to ever see its light. Our presumption of our place in this Universe is just that, a presumption, and you and I both know that nothing is where we think it is because of gravitic lensing, which is always fooling us.

The Universe can continue to expand for infinity because its rate of expansion is constant, not accelerating. That is an illusion which can be proved by the elastic band demonstration, whereby drawing three dots on a straight band six inches long and stretching it to twice its length produces the illusion that the dot farthest from the center dot moved away faster (3 times faster if the far dot was 3 times as far away) than the near dot did from the center dot in the same amount of time.

In fact, all calculations ever made with respect to the actual dimensions of the Universe are completely incorrect. It is impossible to determine the size or age of the Universe but there are any number of ways that someone might attempt this.