Is there radiation colder than the CMBR?

  • Thread starter Thread starter Lino
  • Start date Start date
  • Tags Tags
    Cmbr Radiation
Click For Summary
The discussion centers on whether radiation exists at temperatures lower than the Cosmic Microwave Background Radiation (CMBR), which is approximately 2.5K. Participants clarify that while the CMBR fits a black body power spectrum, any radiation detected at lower frequencies would still conform to this spectrum's shape, merely shifting the peak without introducing new features. There is speculation about the potential existence of "dark radiation" that interacts weakly with matter, which could have a lower temperature than the CMBR, but this remains unproven. The conversation also addresses the nature of power spectra and the relationship between frequency and energy, emphasizing that measurements reflect a spectrum rather than isolated frequencies. Overall, the consensus is that while lower temperature radiation may exist, it would likely still align with the established characteristics of the CMBR.
  • #31
I am wondering from the spectra, or the power curve is it possible to draw conclusions as to how that initial 'oscillation' started?

I hope I can explain what I mean, but if you start an oscillator, from a low energy state it may not achieve its operating frequency instantly, it would probably ramp up to the frequency, so you would have higher power levels in the lower frequencies.

IS the CMB and 'attack' or a 'decay' in nature, did it start at a low energy state and then start, or did it start at a very high energy state and decay.

I know it decays over time, but what about the point it was created, violin bow or guitar pluck?
 
Space news on Phys.org
  • #32
Each atom/particle is its own oscillator, so there is no "initial" oscillation. The power curve is a result of the distribution of energy among all the oscillators, which, if graphed, would follow a similar curve as the power curve.
 

Similar threads

B Is the Hawking-Hartle Euclidean approach confirmed by CMBR data?
  • · Replies 13 ·
Replies
13
Views
3K
I Some questions about Cosmic Microwave Background radiation
  • · Replies 13 ·
Replies
13
Views
6K
I Hawking radiation from de Sitter horizon
  • · Replies 8 ·
Replies
8
Views
3K
Are black holes more redshifted than the CMB?
  • · Replies 10 ·
Replies
10
Views
3K
Why is a drinking bird colder than the ambient temperature?
  • · Replies 1 ·
Replies
1
Views
1K
I Blackbody radiation and the cosmic microwave background
  • · Replies 29 ·
Replies
29
Views
4K
Do Dual Fans Increase Radiator Efficiency More Than a Single Larger Fan?
  • · Replies 6 ·
Replies
6
Views
5K
Was the Early Universe Truly Homogeneous?
  • · Replies 23 ·
Replies
23
Views
6K
I How do emissivity and absorptivity affect thermal imaging results?"
  • · Replies 3 ·
Replies
3
Views
3K
Infrared thermometry remote sensing
  • · Replies 5 ·
Replies
5
Views
2K