All Questions
8
questions
10
votes
1
answer
1k
views
What fraction of the universe's energy is contained in photons?
From each point in the universe, the light of billions of stars, galaxies, supernovae etc. can be detected. So there seems to be a lot of energy/momentum "in flight".
Is it possible to ...
- 347
4
votes
1
answer
114
views
What is the energy spectrum of all photons in the observable universe?
Does anyone know what the energy spectrum for the entire universe looks like? In other words, what would the graph look like if you plotted the number of photons on the $y$-axis and frequency on the $...
- 555
14
votes
1
answer
4k
views
What percentage of the mass/energy of the universe is in the form of electromagnetic waves? [duplicate]
Is there any theoretical framework or model that would lead to a prediction, either precise or approximate, about how much or what proportion of the universe's total mass is in the form of photons, or ...
- 533
-2
votes
2
answers
278
views
Could photons decay into Dark Matter? [closed]
So, we can "see" 13.7 billion (intentionally not including expansion) light years in all directions and we "see" a red shift.
What if, the reason we can't observe photons beyond this limit is that ...
18
votes
2
answers
4k
views
Did the big bang create an infinite number of photons?
We will always be able to see the cosmic microwave background (CMB) at about [the age of the universe] light years away.
Always.
Does that mean that infinite photons were created at that time? If ...
- 781
5
votes
3
answers
207
views
Is the total amount of light today the same as it was 13.8 billion years ago?
Is the total amount of light today the same as it was 13.8 billion years ago? Is it fair to assume that the total background photon flux (ignoring local deviations) given by
$\ cm^{-2}s^{−1}sr^{−1}$ ...
- 69
-1
votes
3
answers
671
views
Is light dark energy?
I was wondering if it was possible for light itself to be dark energy, might sound silly but it's been breaking my brain for months and I can't find any reason why not. If light can interact with ...
10
votes
2
answers
973
views
Do photons and cosmic rays radiate energy through gravitational waves? If not, why not?
Due to the mass-energy equivalence, both matter and EM radiation bend spacetime, and both are capable of forming singularities (black hole, white hole/kugelblitz). In light of this, why do photons ...
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