Comment on Dark Matter
meanmon13@lemmy.zip 2 months ago
I’m pretty sure that dark matter/energy is just this generation’s ether.
Comment on Dark Matter
meanmon13@lemmy.zip 2 months ago
I’m pretty sure that dark matter/energy is just this generation’s ether.
ShaunaTheDead@fedia.io 2 months ago
"dark" in scientific terms just means unexplained. We're very, very, very, and I cannot stress this enough... VERY sure that dark matter and dark energy exist, but they will remain "dark" until we discover what they are/what's causing the effects that we see. Aether was just unfounded non-sense that was based on practically nothing.
mindbleach@sh.itjust.works 2 months ago
Aethyr was a reasonable insistence that light can’t be half as fucky as we now know it is.
ShaunaTheDead@fedia.io 2 months ago
Light is pretty fucky. Like taking the shortest route to it's target through TIME! What the fuck light?!
mindbleach@sh.itjust.works 2 months ago
Not necessarily forward, maybe.
Tlaloc_Temporal@lemmy.ca 2 months ago
I’ll agree on Dark Matter, things like the Bullet Cluster need something more than modifyed gravity, but I’m not so sure about Dark Energy. As far as I know, Dark Energy is the difference in the energy we measure in space and the energy necessary to fuel the acceleration of expansion. This whole idea could change radically with a new understanding of space or the nature of the universe.
Dark Matter is a relatively known unknown; we know there must be some thing here, and are nearly certain it’s more than just a force. Dark Energy is an unknown unknown; something doesn’t match up, but we don’t know what.
ShaunaTheDead@fedia.io 2 months ago
I saw a paper on here recently that basically said they've explained dark energy through what they called "cosmological coupling" of black holes. Basically, black holes absorb space over time, and since space has a base level of energy and energy is kind of a form of mass then the black holes are gaining mass over time and so they are less massive in the past than they are today. I don't 100% understand why that explains dark energy, but it is a very new paper and as far as I know hasn't been peer reviewed yet, so who knows!
Here's the paper: https://www.ifa.hawaii.edu/2023/02/first-observational-evidence-linking-black-holes-to-dark-energy/
Tlaloc_Temporal@lemmy.ca 2 months ago
Interesting. I’ve heard about cosmological coupling before, I wonder if PBS Spacetime or Dr. Becky have mentioned this theory yet.
Showing that BH energy density stays constant, like the proposed cosmological constant, is quite interesting, but I also don’t understand the leap to how that drives expansion. If vacuum energy was everywhere, I can see how that would push things apart and push harder as space grew, but if vacuum energy exists in BHs I can’t make the connection to a repulsive force. Perhaps this is a event horizon resonance mode or something? Where event horizons exists for everything, and they’re size and relativistic motion press upon the universe? I don’t know.
Wikipedia seems to have this paper’s theory listed already (here), though reception seems mixed.