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Time of flight in an expanding universe


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10 minutes ago, andrew s said:

For galactic cluster the gravitation attraction between galaxies is 7 order of magnitude gerater than the tension caused by cosmological expansion and so they remain bound. See here https://arxiv.org/abs/astro-ph/9803097v1

Regards Andrew

I collect books, and I just bought a couple of books by Valerio Faraoni, one of the coauthors of this paper.

Another paper, at a lower and more pedagogical level (but still at the upper-level undergraduate physics level), is

https://arxiv.org/abs/gr-qc/0508052

This paper examines whether cosmological expansion affects a "classical" atom.

 

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16 hours ago, andrew s said:

 You can either use classical wave theory (Maxwell) in which light waves travel at c or you can have QED where photon can be created and destroyed with certain probabilities at specific location.

Yer, tell me about it ! when I did 'him' it looked like this :A1.jpg.edbbea020e989df735eba1f057182c2f.jpg with div and curl and things and I pretended I was understanding ( well it was easy to pretend cos the size of antennas was easy to work out with waves)

but later it became A2.jpg.44d7c972aae2a26f4fd98218dd8e7c48.jpg and I havnt a clue ! It seems that Maxwell did discuss the nabla, I wish he had taught my lecturers !

And that was before Plank and Schrodinger got at it :(

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