Now...exactly when and how do CMB photons lose their 3000˚ K creation energy to become 2.7˚ K?
exactly when and how do CMB photons lose their 3000˚ K creation energy to become 2.7˚ K?
This misunderstanding is so pervasive that we even have a FAQ for it (which you will find if you search the forum for "rest frame photon"). Einstein said no such thing; what he did say is that there is no inertial frame in which light is at rest. Yes, if you assume that such a frame did exist and naively apply the equations of special relativity while setting ##v=c## you would get a division by zero that could be understood as time not passing in that frame - but those equations are derived from an assumption that is equivalent to the assumption that there is no such frame so cannot be correctly applied in this way.how can CMB photons undergo any change ... since time (for the CMB photon) hasn't passed ( dτ0 = 0 ) ?
The above according to Einstein.
There is no "time for the CMB photon" and such a thing is not necessary. The wavelength of the photons scales with the overall expansion of the universe. This is a prediction of general relativity.
As this has nothing to do with the original thread I split the post into a new thread.
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)
If You moved towards the CMB radiation fast enough, the photons would get all their energy back.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 to do with the current, apparently unsolvable impasse confronting cosmologists today.
This is not relevant to the topic of this thread.
This paper just repeats the same misconception you gave in your OP. It is not in any way a valid explanation of the "disconnect" you refer to.
If You moved towards the CMB radiation fast enough, the photons would get all their energy back.
Frequency is frame dependent so not an inherent property of the photon itself.
Any photon has different frequency and energy in different reference frames.
This isn't the only paper.
This question is certainly related to (1) expansion rates as well as (2) Dark Matter
The publisher of this article is a known predatory publisher. This paper should be viewed with immense skepticismJust 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 all its creation energy and frequency until detection. The Fahr/Heyl implication effects (1) expansion rate and (2) vacuum energy density–as shown in the paper's introduction...