Phys. Rev. D 21, 2167–2170 (1980)Where has the fifth dimension gone?Received 11 June 1979; published in the issue dated 15 April 1980 We show that a simple solution to the vacuum field equations of general relativity in 4 + 1 space-time dimensions leads to a cosmology which at the present epoch has 3 + 1 observable dimensions in which the Einstein-Maxwell equations are obeyed. The large ratio of the electromagnetic to gravitational forces is a consequence of the age of the Universe, in agreement with Dirac's large-number hypothesis. © 1980 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevD.21.2167
DOI:
10.1103/PhysRevD.21.2167
PACS:
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