Open AccessVariation of the Gravitational Constant in the Radiation-Dominated Universe
Author(s) -
L. L. Williams
Publication year - 2012
Publication title -
physics research international
Language(s) - English
Resource type - Journals
eISSN - 2090-2239
pISSN - 2090-2220
DOI - 10.1155/2012/567873
Subject(s) - physics , scale factor (cosmology) , gravitational constant , general relativity , cosmological constant , metric expansion of space , gravitation , context (archaeology) , cosmology , universe , theoretical physics , mathematical physics , classical mechanics , dark energy , quantum mechanics , paleontology , biology
The unification of classical electrodynamics and general relativity within the context of five-dimensional general relativity (Kaluza, 1921, and Thiry, 1948) contains a scalar field which may be identified with the gravitational constant, G. The field equations of this theory are solved under conditions of the Robertson-Walker metric for flat space, for a radiation-dominated universe—a model appropriate for the early history of our universe. This leads to a cosmology wherein G is inversely proportional to the Robertson-Walker scale factor. This result is discussed in the context of the Dirac large number hypothesis and in the context of an expression for G in terms of atomic constants
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