The current theoretical model for the composition of the universe is that it's made of normal matter, dark energy and dark matter. A new University of Ottawa study challenges this.
Absolutely. On the one hand, having ~26% of the known universe consisting of a substance that we cannot detect directly leaves a lot of questions open. On the other hand; dark matter is postulated because otherwise things like galaxy rotation curves don’t match what we believe they should be from general relativity, and this theory doesn’t seem to address that.
I’m no expert, and I don’t think we know for sure, but it sounds like it might be related to the increase in vacuum energy from the added space. It’s also possible the total amount of net energy in the universe is 0 and conserved
Absolutely. On the one hand, having ~26% of the known universe consisting of a substance that we cannot detect directly leaves a lot of questions open. On the other hand; dark matter is postulated because otherwise things like galaxy rotation curves don’t match what we believe they should be from general relativity, and this theory doesn’t seem to address that.
https://en.wikipedia.org/wiki/Bullet_Cluster#Significance_to_dark_matter
Also, light ‘losing energy’ would be a violation of the first law of thermodynamics, unless it loses it ‘to’ somewhere.
Light does actually just lose energy to nowhere in our current understanding of expanding space.
How does this reconcile with the first law of thermodynamics? Or does it just not?
I’m no expert, and I don’t think we know for sure, but it sounds like it might be related to the increase in vacuum energy from the added space. It’s also possible the total amount of net energy in the universe is 0 and conserved