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RE: Is standard cosmology challenged by the structure of the galaxies?
Hey @lemouth, nice read.
I think that the accelerating expansion of the Universe is proof that all matter in the Universe was once massed in a point of infinite density. Sounds like evidence supporting the big bang theory.
Furthermore, could gravity be the reason we can't actually observe dark matter? Or maybe should we start looking at different wavelengths of the electromagnetic spectrum?
I'd love to know your thoughts!
There are plenty of evidence supporting standard cosmology. However, other options are still very alive.
Dark matter is by definition not electromagnetically interacting. So no, the EM spectrum won't help here. The gamma ray spectrum could in contrast be helpful (dark matter annihilation produces cosmic rays that we can detect).
Dark matter can be many things, and not all options are currently covered by the direct detection experiments. They will however probably be in a decade or two. So that we just have to be patient. For the moment, all pieces of evidence are indirect. We are missing the direct observation.
And again, other non-dark-matter options are still alive, although not as appealing...
I greatly appreciate your detailed response.
I get it that we can basically observe the effects of the presence of dark matter and therefore realize it actually exists even though we can't collect direct pieces of evidence, however I find it rather confusing how matter can actually not interact with electromagnetic radiation at all. That basically means no radiation is absorbed nor reflected whatsoever.
There must be some fundamental differences between ordinary and dark matter in terms of frequency and vibration. I'm no expert though, just speaking my thoughts!
Thanks for the information!
Any electrically neutral particle does not interact electromagnetically. Take the neutrino for instance.
This I am not sure to understand what you mean. I would need clarifications.