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Not knowing much about the subject: cosmological principle appears to say that laws of physics are uniform in space. Then, with known matter and forces, this le
by rich_sasha 5y ago
Not knowing much about the subject: cosmological principle appears to say that laws of physics are uniform in space. Then, with known matter and forces, this leads to some structure, with fluctuations, and hence some scale over which matter is uniformly distributed.
If we calculate such a scale and find matter is still not uniform at that scale, wouldn’t the first conclusion be that there are missing terms in either matter or interactions (or both)? Rather than saying that laws of physics are not space-homogeneous.
The article itself states that the length scale where the c10l principle kicks in is derived from a particular model for matter and interactions (lambda CDM).
I think there is plenty of discrepancies between standard model and observations (most of them small). We don’t know what dark matter is, either. So to me the interesting point wouldn’t be, is the model wrong, but how is it wrong?
- ianai 5y agoPer Sabine H on YouTube ( https://youtu.be/JETGS64kTys https://youtu.be/JETGS64kTys ), the cosmological constant might be smaller than called for in current cosmology. That would agree with some other observations.
- deleted 5y ago[deleted]
- evgen 5y ago> the c10l principle Don't do this. It is bad enough that every major devops/infra component needs to create some <letter><number_of_missing_letters><letter> tag, but dropping it in to random places is worse than the regular backronyms and cute project names science and tech people use to try to hide complexity. It just adds confusion for no rhyme or reason other than trying to sound like you are a part of some club of insiders.
- beeboop 5y agoYou see it everywhere really. Military and politicians and government orgs all do it to embarrassing lengths too
- EGreg 5y agoThey also call things polintelcom and codenames like eschelon and prism, doesnt mean it’s great practice for us Btw ESCHELON and Five Eyes coordination existed for so long and people only woke up when Snowden revealed prism
- nextaccountic 5y agothe name is echelon
- deleted 5y ago[deleted]
- rich_sasha 5y agoDude I’m typing on my phone and autocorrect doesn’t know “cosmological”. There, I spelled it out.
- lurquer 5y ago> Don't do this. Do not do that.
- teilo 5y ago> Rather than saying that laws of physics are not space-homogeneous. No one is saying that, and if the cosmological principle falls, it does not imply that in the least. It just means we need to revisit our assumptions about things like hyperinflation, dark matter, etc. Even more exciting, it may mean we need to look for the remnants of a force active during the initial inflation of the universe, that can account for the non-uniformity of matter's distribution.
- rich_sasha 5y agoHmm, but if the principle comes with a model-dependent length scale, that experimentally looks wrong, why should I discard the principle when it might as well be an incomplete model? Or frankly inaccurate estimation, my understanding is that it is extremely hard to actually sully simulate the lambda-CDM model from Big Bang.