Vladimir Leonov
The question was asked on the livescience forum: "Why the universe looks the same irrespective direction and position?" Apr 18, 2021. According to Friedman, the universe looks the same irrespective of direction and position. But I don't get it. https://forums.livescience.com/threads/why-the-universe-looks-the-same-irrespective-direction-and-position.5613/
Two answers were given which did not clarify anything. Therefore, I had to give my answer, since I have been working on this topic for more than a quarter of a century as the author of Quantum Superunification Theory (QST):
1. V.S. Leonov. Theory of an elastic quantized medium: 1996 (В.С. Леонов. Теория упругой квантованной среды: 1996). http://leonovpublitzistika.blogspot.com/2021/07/1996.html
2. Leonov V. S. Quantum Energetics. Volume 1. Theory of Superunification. Cambridge International Science Publishing, 2010, 745 pages.
3. V.S. Leonov. Quantum Energetics: Theory of Superunification. Viva Books, India, 2011, 732 pages.
A more detailed answer to the question posed is given in my paper:
Vladimir Leonov. Comments on arXiv papers loop quantum gravity. Blog Leonov: 2021-07-02, 91 pages, https://theoryofsuperunification-leonov.blogspot.com/2021/07/comments-on-arxiv-papers-loop-quantum.html, [Submitted 02 July, 2021].
Part 15. The Universe is a natural warp drive that provides wave acceleration of galaxies.
My shorter answer on the forum to the question "Why the universe looks the same irrespective direction and position?" read here:
I believe that the universe is much larger than we see it in the most powerful telescopes. Moreover, we cannot look at the universe from the side in real time. Since we see that galaxies are flying with acceleration, there must be an expansion front for galaxies. We do not know the width of this front and its curvature. This expansion front should be spherical and it looks like a rubber shell whose thickness we do not know. This is a consequence of Einstein's theory and this fact was pointed out by other scientists.
Inside this spherical expanding shell is the visible region of the Universe. The visible part of the Universe is located inside this spherical expanding shell. Therefore, we perceive our universe as flat and homogeneous. It seems astronomers have already measured the curvature of the universe. But the main thing is that if we are inside the visible region of the Universe, which is much smaller than the spherical front of expansion, then galaxies should have different speeds and different acceleration of expansion.
Then we can have a map of the expansion of galaxies with vectors of the expansion rate of galaxies. Next, we can calculate from this map the curvature of the universe, the width of the expansion front and the direction to the center of the expanding universe and our position on this map. This work must begin to be done. It seems astronomers have already established that galaxies are expanding at different speeds. Then this fully confirms the spherical shape of our universe inside the spherical front of the expansion of which there are galaxies. It is like a rubber shell of a ball and inside this shell are galaxies. Therefore, we observe that all galaxies move away from each other when such a shell expands.
I am repeating that this is the generally accepted model of an expanding universe according to Einstein's theory. We have to make only one addition, that the visible area of the spherical universe is much smaller than its actual size.