All Questions
4
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Radiation from a moving charge particle in expanding universe?
Moving charged particles generally emmit energy in form of radiation.
Assume a charged particle that is situated in a zone that can join the Hubble flow and therefore starts moving away from us.
As it ...
- 2,462
0
votes
0
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169
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Infinite universe and the impossibility of monochromatic light and infinite plane waves
I recently asked a question relating to this excerpt from the textbook Optics, fifth edition, by Hecht:
Mathematically, the plane wave extends out to infinity in all its directions, and, of course, ...
- 889
5
votes
3
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207
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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
3
votes
2
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436
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Do electromagnetic fields gravitate?
It's well known that electromagnetic fields contains energy but do they gravitate?
When we talk about the composition of the universe it's now accepted that the 74% is dark energy, the 22% is dark ...
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