Started by Unbeliever, August 13, 2019, 04:56:37 PM
Quote from: Unbeliever on August 13, 2019, 04:56:37 PMIt might be that the Hubble parameter is not a constant, but varies with location...
Quote from: aileron on August 13, 2019, 09:01:32 PMPossibly, but two teams working independently in the late 90's confirmed that the Hubble Constant is not constant over time. They measured the received power of type 1a supernovae (which explode at a known power) to measure vast distances more accurately than possible before. To their surprise, they determined that the rate of acceleration is increasing. Particle physicists think it may be vacuum energy -- the more space, the more vacuum energy, which explains the acceleration.
Quote from: Unbeliever on August 14, 2019, 04:13:18 PMNo one's quite sure just what is causing the accelerated expansion. They call it "dark energy" because they don't know what else to call it. But they don't really understand the mechanism of what's driving it.
Quote from: Unbeliever on August 14, 2019, 04:38:39 PMIt seems to me that as the voids grow larger, their growth-rate would increase as well, which could explain the accelerated expansion. The difference in time flow between the clusters and voids may be miniscule, but over the lifetime of the universe could have added up to a significant amount of elapsed time difference since the big bang.
Quote from: aileron on August 14, 2019, 05:31:34 PMHere's a good writeup on the accelerating expansion and why many particle physicists think it's vacuum energy. The problem is we don't have a good measurement of vacuum energy. Right now QFT doesn't make a prediction for vacuum energy density, and attempts to estimate it extrapolating from QFT result in an estimate 120 orders of magnitude greater than what observations in astrophysics suggest.http://math.ucr.edu/home/baez/vacuum.html
Quote from: Baruch on August 14, 2019, 07:27:30 PM Without a good quantum gravity theory, we know nothing about this vacuum shit.
Quote from: josephpalazzo on August 16, 2019, 08:22:17 AMQuantum gravity theory is over-rated...
Quote from: Baruch on August 16, 2019, 05:22:15 PMPythagorean panaceas usually are. Pythagoras already had the answer ... "one".
Quote from: josephpalazzo on August 16, 2019, 05:25:12 PMWell, TOE is an interesting fantasy. But some people are rude when you debunk...
Quote from: Baruch on August 16, 2019, 05:53:51 PMIf the first guy got the right answer, then what point do the successors have?
Quote from: josephpalazzo on August 16, 2019, 06:13:09 PMA prime number?