greggm2000 wrote...
tractrpl wrote...
greggm2000 wrote...
My understanding is that some theorie(s) have dark energy not existing at all. So there's that as a possibility.
Maybe, but not really. Some Loop Quantum Gravity (LQG) theorists speculate that the energy is just "space replicating", or space growing. String theory, space is continuous, so it can't "grow", but in LQG, space is made up of tiny individual space "quanta" just like you are made up of individual atoms, so space is made up of, um, space atoms, hehe. In this theory, there's not Dark Energy per se, it's just that the space between distance objects is growing, literally. Space creates more space. This gives the appearance of objects accelerating away from each other, thus implies there's an energy responsible. This interpretation is correct, the creation of "new" spacetime could be said to be a type of energy, it's just a different view, I suppose.
No scientist would say that Dark Energy "doesn't exist" the proof is conclusive. Galaxies are accelerating away from each other. SOMETHING is causing it, and that thing is called Dark Energy for lack of a better term.
I thought it was a matter of the mathematics in at least one mainstream theory which explains that acceleration that Dark Energy was invented to explain? .... and (correct me if I'm wrong), isn't the rate of acceleration decreasing at the very largest scales?
I'm not nearly as informed on this as I could be, and I'm certainly no astrophysicist, heh! So I could be totally wrong in this.
The rate of acceleration is actually increasing. That's part of what led to the hypothesis of dark energy in the first place, as the rate of acceleration wasn't constant, if I recall correctly.





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