Mr. nuclear scientist FLRW, your Big Bang CMBR is a leap of faith as visible in the following per Mr. nuclear physicist professor scientist Kroupa.
Pavel Kroupa, astrophysicist and professor at the Helmholtz Institute for Radiation and Nuclear Physics at the University of Bonn and Charles University in Prague, expressed “According to our calculations, it may not exist at all” regarding the Cosmic Microwave Background Radiation (CMBR) as per his study published in the journal Nuclear Physics B (source: “Goodbye to the Big Bang theory: a university challenges everything we thought we knew and suggests that the creation of the universe may have been something else” (Austin Caldwell; MARCA; 2025-06-28).
Kroupa, with additional author Eda Gjergo, expose evidence against the existence of the CMBR. These two extracts from their abstract explain:
A previously overlooked foreground component is the formation of massive early-type galaxies (ETGs), which can no longer be ignored, particularly in light of JWST’s detection of massive, evolved systems at extreme redshifts (z>13).
Even in our most conservative estimates, massive ETGs account for 1.4% up to the full present-day CMB energy density.
(source: “The impact of early massive galaxy formation on the cosmic microwave background” (Eda Gjergo, Pavel Kroupa; Nuclear Physics B published by Elsevier aa distributed on ScienceDirect.com; August 2025; Article: 116931; Volume 1017))
Astronomer astrologers best case scenario is that a “definitive 2.725 K” is conservatively off by 1.4% to 100% which means the MIT trained nuclear scientist FLRW has science fiction expressed as scientific fact in his own composition in this thread of:
@FLRW wrote in post #664l6: Several lines of evidence and theoretical arguments challenge Pavel Kroupa’s claim
MITman, your AI IQ puts your grounds for belief (evidence definition in post #25) in your Big Bang CMBR on similar grounds for belief (evidence) for Kroupa’s. Both of you are in a leap of faith.
@FLRW wrote in post #664l6: Discrete galaxy sources cannot reproduce this — as Ethan Siegel
Scientist FLRW, your scientist Siegel cannot know (science) that “Discrete galaxy sources cannot reproduce this”, so your Siegel believes without proof (assumption definition in post #53); therefore, scientist FLRW, your scientist Siegel is in a leap of faith with you.
@FLRW wrote in post #664l6: The 1.4% → 100% leap
You agreed with me that Kroupa is in a leap!
@FLRW wrote in post #664l6: A peer review on Pith (2026) notes that the upper bound (“up to 100% of CMB energy density”) rests on “assumptions that are neither derived nor mutually consistent.”
I present to you your “assumptions that are neither derived nor mutually consistent” which results in your Big Bang being a leap!
You provided absolutely, positively no scientific method basis for your faith based Cosmic Microwave Background Radiation (CMBR)!
I present to you the history recorded by others which reveals CMB was a known quantity decades before 1964. This directly derails your “predicted” “fact” leaving a mere residual called “faith” (see post #376).
Andrew McKellar used W. S. Adams’ spectroscopic instrumentation during 1941 to measure background temperature of 2.3 K of a B type star.
In 1948, cosmologist George Gamow led a group that calculated cosmic microwave radiation.
The vaunted Bell Telephone Laboratories had a facility atop Crawford Hill in Holmdel, New Jersey where Arno Penzias and Robert Wilson experimented in 1964. They detected a homogeneous, constant radiation. They were awarded the Nobel Prize in 1978 for their CMB work.
Robert H. Dicke, Jim Peebles, and David Wilkinson, astrophysicists at Princeton University believed the Big Bang emitted a tremendous radiation blast resulting in cosmic microwave background radiation (CMBR), and they prepared to investigate microwave radiation levels in the year 1964.
But, Bernard F. Burke, professor of physics at MIT (your alma mater), introduced the two groups working a mere 40 miles from each other.
The two groups agreeably jointly published in Astrophysical Journal Letters. Two notes were published, (1) Dicke et al substantiated the Big Bang based on CMBR, and (2) Penzias et al noted the existence of 3.5 K CMBR universally.
McKellar recorded the CMBR in 1941, so the CMBR was a known quantity by the time of Penzias et. al. as well as Dicke et. al.; therefore, neither Penzias et. al. nor Dicke et. al. “predicted” anything. You wrote deception.
In essence, your history of using something like the RW Metric (see post #361 for RW Metric details) deceives people, including you.
It is time to compare and contrast these data collections:
- McKellar (1941): (2.5 +0.9/-0.7) K
- Penzias and Wilson (1965): (3.5 +/- 1.0) K
Your manipulation of statistics (mathematical nonsense) to arrive at “this faint microwave glow fills all space and matches the exact predicted cooling afterglow of a hot early universe” is a deeper lie and malevolent representation.
Your astrophysicist high priest Stephen Hawking issued the condemnation of astronomer astrologers with “a case of knowing the result they wanted to get, not an uncommon occurrence in science”, so you keep his words in mind while reading the following.
Set theory is fascinating, and set theory is destructive to your argument.
- McKellar (1941): M = {x ∈ R | 1.8 ≤ x ≤ 3.4}
- Penzias and Wilson (1965): P = {x ∈ R | 2.5 ≤ x ≤ 4.5}
M and P represent two mutually exclusive, independent and discreet studies.
M=P is false.
M∩P is a range of real number temperature elements that potentially one set can be greater than or lesser than the temperature in the opposing set (except for the boundaries which would be equality on one side), so M∩P elements are excluded from this evaluation because these cancel each other out. This leaves the elements represented in MΔP.
MΔP is the range of real number temperature elements that uniquely qualify as exclusively greater than or less than the temperature in the opposing set, so MΔP is included in this evaluation.
Proof samples:
- M∩P and M>P, M=3.2 and P=3.1
- M∩P and M<P, M=3.1 and P=3.2
- MΔP and M>P, nonexistent
- MΔP and M<P, M=1.8 and P=4.5
- MΔP and M<P, M=2.4 and P=3.5
The exemplary intersection (M∩P) elements of 3.1 and 3.2 sufficiently illustrate the cancelation effect of the corresponding intersection elements.
The result is M<P.
The CMBR temperature increases going forward in time according to this logic demonstrated using set theory which potentially indicates a lower temperature in the past.
Set theory applied to your star bible data upends your “this faint microwave glow fills all space and matches the exact predicted cooling afterglow of a hot early universe” writing.
Scientists like averages (mean), or medians, or blind faith guesses, such as the astronomer astrologer’s current magical, mystical 2.7255 K CMBR nonsense nonscience temperature, so I present the mean temperature values to test their conclusion that there has been a decrease in the temperature over the years.
The data averaged:
- McKellar (1941): 2.5
- Penzias and Wilson (1965): 3.5
2.5=3.5 is false.
2.5<3.5 is true.
1941<1965 is true.
3.5-2 5=1.0 is true.
1965-1941=24 is true.
The five factual statements directly above show a 1.0 K increase of heat on average over a period of 2 dozen years starting in 1941 AD until 1965 AD.
A decrease in heat temperature from 1941 to 1965 is the Big Bang adherent’s requirement, but it’s just not there, so your CMBR is very bad evidence for your Big Bang.
The above dissection of historical data shows that these are each distinctly different surveys:
- McKellar (1941): (2.5 +0.9/-0.7) K
- Penzias and Wilson (1965): (3.5 +/- 1.0) K
McKellar (1941): (2.5 +0.9/-0.7) K is not isotropic agreement with Penzias and Wilson (1965): (3.5 +/- 1.0) K.
Statistical consolidation of the points is unreasonable because reasonable doubt has been cast by the potential for decreased temperature in earlier time thus anyone claiming increased temperature is a person defying the logical conclusion from the data; in other words, you cannot logically claim that there was a high heat temperature deep in the past around your Big Bang timeframe which would make the differences in points statistically insignificant. The differences in points are statistically significant as a function of the recorded increase in temperature over the decades, yet astronomer astrologers exhibit Stephen Hawking’s quote, recorded above.
In other words, these measurements are in agreement with one another that the Big Bang is a leap of faith/belief.
Deception of the CMBR is a very poor method to present your case.
Various sources of material for this whole CMBR section include “cosmic microwave background” of Encyclopedia Britannica, “Cosmic microwave background” of Wikipedia, and “A Review of the 1941 to 1961 CMBR Temperature Measurements” on ResearchGate.
Your grounds for belief (evidence) is very bad evidence for the Big Bang.