Size of a hydrogen atom in the expanding universe

Details Size of a hydrogen atom in the expanding universe Size of a hydrogen atom in the expanding universe

Apr 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999cqgra..16.1313b&link_type=abstract

Classical and Quantum Gravity, Volume 16, Issue 4, pp. 1313-1321 (1999).

Computer Science

15

Scientific paper

I take a simple model of the hydrogen atom in a universe without spatial curvature. The Maxwell equations are formulated on the background cosmic spacetime. For a class of cosmic metrics, which includes the de Sitter universe, these equations admit solutions corresponding to an atom whose radius remains strictly constant during the expansion. In the Einstein-de Sitter universe approximate calculations show that the atom expands, but at a rate which is negligible compared with the general cosmic expansion.

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