Originally Posted by

**budrap**
I completely agree "...that there is no meaning whatever to global simultaneity." That is in fact the point of the Cosmological Uncertainity Principle. And if it is true then there is no meaning to such statements of global simulteneity as:

**The Universe is 13.7 billion years old.**

13.7 billion years ago the Universe was smaller and denser than it is now.

The Universe is expanding.

The expansion of the Universe is accelerating.

And if those statements have no meaning then the currently accepted Standard Cosmological Model is devoid of meaning also.

Your mathematical incompetence is showing again. This has been explained several times elsewhere, but here it is again for those who, unlike you, are capable of understanding.

**The cosmological model is based o general relativity and the additional assumption that the universe is homogeneous and isotropic.** While the universe is manifestly neither homogeneous nor isotropic on the small scale observation does indicate that it is homogeneous and isotropic on the largest scale, and that is sufficient for cosmology.

Under general relativity a homogeneous and isotropic spacetime decomposes as a one-parameter foliation by 3-dimensional space-like hyperspaces of constant curvature. Those hypersurfaces inherit a true Riemannian metric from the Lorentzian metric of the full spacetime. The time-like parameter of the foliation serves as a surrogate for time.

The age of the universe is measured by the parameter which serves as global time..

The space-like hypersurfaces are what is called space.

Expansion of space is measured by the increasing distance between points as measured by the Riemannian metric thereon as a function of the parameter, time.

Density is determined by mass density on the hypersurfaces.

Acceleration is determined by the rate of change of the expansion of space.

Cosmologists in addition typically select a convenient reference frame, the frame in which the CMB is isotropic

So you see, there is a well-defined meaning to each of the concepts that you challenge. As usual, lack of mathematical competence has rendered you scientifically illiterate.