Astronomy and Astrophysics – Astrophysics – General Relativity and Quantum Cosmology
Scientific paper
2008-04-08
J.Math.Phys.50:062501,2009
Astronomy and Astrophysics
Astrophysics
General Relativity and Quantum Cosmology
29 pages, 7 figures
Scientific paper
10.1063/1.3133946
We consider classical particles coupled to the quantized electromagnetic field in the background of a spatially flat Robertson-Walker universe. We find that these particles typically undergo Brownian motion and acquire a non-zero mean squared velocity which depends upon the scale factor of the universe. This Brownian motion can be interpreted as due to non-cancellation of anti-correlated vacuum fluctuations in the time dependent background space-time. We consider several types of coupling to the electromagnetic field, including particles with net electric charge, a magnetic dipole moment, and electric polarizability. We also investigate several different model scale factors.
Bessa Carlos H. G.
Bezerra Valdir B.
Ford L. H.
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