OtterJul 9, 2024

We need to consider alternatives to dark matter that better explain cosmological observations

https://lemmy.ca/post/24701956

We need to consider alternatives to dark matter that better explain cosmological observations - Lemmy.ca

The article is by Rajendra Gupta, Adjunct professor Physics @ L’Université d’Ottawa/University of Ottawa First few lines: > Do constants of nature — the numbers that determine how things behave, like the speed of light — change over time as the universe expands? Does light get a little tired travelling vast cosmic distances? It was believed that dark matter and dark energy explained these cosmological phenomena, but recent research indicates that our universe has been expanding without dark matter or dark energy. > > Doing away with dark matter and dark energy resolves the “impossible early galaxy problem,” that arises when trying to account for galaxies that do not adhere to expectations regarding to size and age. Finding an alternative to dark matter and energy that complies with existing cosmological observations, including galaxy distribution, is possible.

Show threadtrachesJul 9, 2024

Astronomers are surprised to learn that many observations show a complete absence of dark matter or dark matter-deficient structures. This leads one to question its existence.

This is evidence for dark matter, not against it.

Relevant xkcd

Unusual Galaxies Defy Dark Matter Theory – W. M. Keck Observatory

Show threadmagiccupcakeJul 9, 2024

It does raise a pretty big audio though.

How did it end up with no dark matter? We don’t have a good answer usually.

Show threadKichaeJul 9, 2024

The problem being that none of the alternative models have good explanations, either.

It’s not like astronomers like dark matter. Most kind of hate it. But every time people try to sell alternate models, they spend their time trying to find examples that raise corner cases for dark matter while ignoring the fact that their favourite models also don’t address the issue.

Which, you know, is acting in bad faith.

Show threadlost_faithJul 9, 2024
Dark matter/energy is just a place holder as we have no idea what it is. How do we know that it isn’t a second, or multiple, “universe/s” taking up the same space and same time but out of sync so we can neither see nor interact with anything from there but their gravity affects us and ours them?
Show threadwholookshereJul 9, 2024

Because that sounded like a chat gpt answer.

In case you actually want an answer, is what observable effects would that have, and can we verify them?

If the answer is no, then it’s not a better theory than shrugging your shoulders and saying dark matter.

Show threadcalcopiritus
It looks nothing like chatGPT
Jul 10, 2024 at 5:42amWeb