Dark Energy Question

[Ser Scot A Ellison]

Please correct me if I'm wrong but if the acceleration is not universal but only in pockets that's pretty weird unto itself and suggests not a universal addition of energy but localized inputs of energy from sources as yet unidentified?

[Loge]

7 hours ago, The Anti-Targ said:

What's steady state anyway? Regardless of accelerated expansion or not, we're eventually heading to heat death of the universe in several trillion years are we not? So under no scenario is there a steady state in the manner most people might think.

Steady state cosmology assumes that the mass density in the universe stays constant despite its expansion. That means new mass has to be created all the time, but at a rate too low to be observable in the lab. It can't deal with the cosmic microwave background, though.

https://en.wikipedia.org/wiki/Steady_State_theory

[Altherion]

7 hours ago, Ser Scot A Ellison said:

Please correct me if I'm wrong but if the acceleration is not universal but only in pockets that's pretty weird unto itself and suggests not a universal addition of energy but localized inputs of energy from sources as yet unidentified?

Yes, it would be pretty weird. Imagine something really, really massive sitting outside of your particle horizon. You can't observe it because light has not had time to reach you yet, but it will pull galaxies near it (including ones between it and you which you can see) towards itself so from your perspective it looks like they're accelerating away from you. Of course, in this case they'd all be accelerating in one direction so it wouldn't look like what we see, but if there was a whole bunch of these super massive things distributed in an asymmetric way, you might get something like our observable universe.