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Effective time variation of G in a model universe with variable space dimension

✍ Scribed by Reza Mansouri; Forough Nasseri; Mohammad Khorrami

Publisher
Elsevier Science
Year
1999
Tongue
English
Weight
73 KB
Volume
259
Category
Article
ISSN
0375-9601

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✦ Synopsis

Time variation of the Newtonian gravitational constant, G, is studied in model universes with a variable space dimension proposed recently. Using the Lagrangian formulation of these models, we find the effective gravitational constant as a function of time. To compare it with observational data, a test theory for the time variation of G is formulated. We have assumed a power law behavior of the time variation of G where the exponent b is itself time dependent. Within this test theory we are able to restrict the free parameter of the theories under consideration and give upper bounds for the space dimension at the Planck era. The time variation of G at earlier times, such as the time of nucleosynthesis is also predicted which express the needs to look for related observational data.

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