Cymek said:
https://bigthink.com/starts-with-a-bang/new-anomaly-universe/
Early relics and late-time objects give incompatible results for the expanding Universe. This independent anomaly intensifies the problem.
The most puzzling, unexplained anomaly in all of cosmology is the Hubble tension: the difference in the measured expansion rate depending on which method is used.
However, a second, less-publicized anomaly is also extremely puzzling: a difference in our observed motion through the Universe and how different things appear in various directions.
We have many different methods of estimating how the Universe differs in different directions, and they’re not all consistent with one another.
That’s a real, unsolved, but important problem!
> https://bigthink.com/starts-with-a-bang/new-anomaly-universe/
Nice article!
The “Hubble tension” is a left-over from the days before dark energy was discovered. Dark energy resolved at least 95% of the difference in age between old stars and cosmic expansion, but a small component remains. A component that hasn’t either grown or shrunk since.
> This “CMB dipole” reflects our Sun’s relative motion to the CMB: of ~370 km/s.
Thank you for the update. I had it down as 400 km/s. Half of that is due to the Sun’s orbit around the Milky Way. The other half is due the movement of the Milky Way relative to the universe.
> Our Local Group moves much faster: ~620 km/s.
Huh? That can’t be right.
> This should be due to cosmic, gravitational imperfections tugging on us.
Not necessarily.
> Nearby galaxy motions consistently support this picture.
Oh, OK. This is the famous “great attractor”.
> However, more distant motion tracers conflict with it.
> Plasmas within clusters indicate smaller overall motions: below ~260 km/s.
> The brightest cluster galaxies, however, reveal larger motions: ~689 km/s.
> Cluster scaling relations reveal giant, wrong-directional motions of ~900 km/s.
> And anisotropies in galaxy counts reveal more than double the expected effect.
> Radio galaxy counts are even worse: four times the expected amplitude.
> Quasar counts from WISE possess the same problem.
Um …
Worth keeping in mind.
I’ve looked for evidence of my hypothesis, that dark matter gravity acts by Quantum Mechanics as opposed to baryonic matter that acts by General Relativity.
I don’t see any evidence supporting my hypothesis there. It would show up as a discrepancy between velocity of motion (as described here) and gravitational lensing of light (which doesn’t appear here). Rather than as a discrepancy between different ways of measuring the influence of gravity on velocity of motion.