Uniform cosmic microwave background radiation

JoeyKnothead wrote: Mon Sep 05, 2022 2:33 pm

otseng wrote: Mon Sep 05, 2022 8:34 am I’m no astronomer or cosmologist, but I think we can try to reason it out. The first thing is to determine is what is the shape of the universe. Is it really curved 3-dimensionally so that we are like on the surface of a 4 dimensional sphere? This would be a non-Euclidean universe. Or is it a 3-dimensional universe like what we typically experience here on earth, a Euclidean universe? There is no proof to support either, but the most parsimonious view would be a Euclidean universe since there is no need to posit another dimension. There are some other arguments against a non-Euclidean universe, but I’ll present those later.

You tell it yourself – There’s no proof to support either of the two positions you present, thus, we can’t say we are, or ain’t at the center of the universe.

So far as parsimony, that’s not a fail safe indicator of truth, so again, we just can’t tell.

Parsimony was one of the primary reasons why heliocentrism with elliptic orbits was preferred over geocentrism with epicycles, even though there was no concrete evidence for heliocentrism until 1838.

We just don’t have the technology to peer beyond the proposed 15 million lightyear limit at this time.

Not sure where you got the 15 million light year limit, but the cosmic microwave background radiation (CMBR) is an artifact that goes back to an early stage of the Big Bang.

In Big Bang cosmology the cosmic microwave background (CMB, CMBR) is electromagnetic radiation that is a remnant from an early stage of the universe, also known as “relic radiation”.[1] The CMB is faint cosmic background radiation filling all space. It is an important source of data on the early universe because it is the oldest electromagnetic radiation in the universe, dating to the epoch of recombination when the first atoms were formed.

https://en.wikipedia.org/wiki/Cosmic_mi … background

One thing about the CMBR is uniformity in origination and detection.

The glow is very nearly uniform in all directions, but the tiny residual variations show a very specific pattern, the same as that expected of a fairly uniformly distributed hot gas that has expanded to the current size of the universe.

https://en.wikipedia.org/wiki/Cosmic_mi … easurement

This poses a problem, why should we detect it to be uniform? There are several possible explanations. One is we are near the center of the Euclidean universe. Or the universe is non-Euclidean. Or another proposal is introducing another ad hoc explanation – cosmic inflation.