Recent content by sector99

The authors above remind that the energy/frequency changes occur only at the adibatic world clock detection time and place.

This isn't the only paper. This question is certainly related to (1) expansion rates as well as (2) Dark Matter.

As you can see from the abstract of Fahr/Heyl (keywords, above) the phrase "Dark Matter" appears and this is why I chose to post the above paper as well as my query RE: When exactly do CMB photons lose their creation energy from 3000˚ K to 2.7˚ K ? in the Dark Matter thread. It has everything...

Just today, Adam Riess clearly admitted that the community "we're missing something". That "something" is so big that it has misled researchers. The disconnect (apparently from below) arises from the reality that time hasn't passed for the photon. Thus the freely propagating CMB photon carries...

With respect ... how can CMB photons undergo any change ... since time (for the CMB photon) hasn't passed ( dτ0 = 0 ) ? The above according to Einstein. As for this relation to DM ... measurements of CMB energy have everything to do with this thread.

Now...exactly when and how do CMB photons lose their 3000˚ K creation energy to become 2.7˚ K?

FYI https://phys.org/news/2019-04-hubble-universe-faster.html

The SDSS (and its supercomputer facimilies) reveal spatial voids and enveloping baryonic aggregations. It appears that baryons/DM have more affinity for themselves than they do for whatever is filling the voids. Ergo my query.

["Again, saying that the dark matter community is reluctant towards new physics could not be further from the truth."] Well said. The effort may well trend towards a hybrid solution–given the extreme complexity of SDSS large-scale mapping. Starting with the question: Do DM constituents have to...

DM not being "compressed" or, collected by galactic center gravitation was what I meant to say. On the characteristic of being collisionless–does this feature reduce exotic bosonic/hadronic matter as a DM candidate?

Thanks. This raises a query about DM density waves. I'm guessing that since DM somehow can't be "compressed" there can't be any DM density waves thus the spiral appearance (which doesn't arise from kinematic rotation-including especially the barred spirals) is due solely to baryonic matter?

Off Topic FYI:

Thank you for this. (assembled & quoted from above) Let me take another attempt to answer my 1st query: "What exactly are observers seeing when they detect DM"? (1) Galactic baryons showing anomalously high relative speed infers DM. (Normal stellar velocities were recently asserted to reveal...

Let me take another attempt to answer my 1st query: "What exactly are observers seeing when they detect DM"? (1) Galactic baryons showing anomalously high relative speed infers DM. (Normal stellar velocities were recently asserted to reveal an absence of DM) (2) Detectable gas displaced from...

Confusion stemmed from an official NASA release by a writer with the Chandra group who is much closer to the topic than I. Your view is correct. I have discarded the popular DM misperception that DM can be seen and more carefully reread Clowe et al to fully agree with all points of your...