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Scale of gravity and the cosmological constant within a landscape

Graesser, Michael L. and Salem, Michael P. (2007) Scale of gravity and the cosmological constant within a landscape. Physical Review D, 76 (4). Art. No. 043506. ISSN 2470-0010. doi:10.1103/PhysRevD.76.043506.

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It is possible that the scale of gravity, parametrized by the apparent Planck mass, may obtain different values within different universes in an encompassing multiverse. We investigate the range over which the Planck mass may scan while still satisfying anthropic constraints. The window for anthropically allowed values of the Planck mass may have important consequences for landscape predictions. For example, if the likelihood to observe some value of the Planck mass is weighted by the inflationary expansion factors of the universes that contain that value, then it appears extremely unlikely to observe the value of the Planck mass that is measured within our universe. This is another example of the runaway inflation problem discussed in recent literature. We also show that the window for the Planck mass significantly weakens the anthropic constraint on the cosmological constant when both are allowed to vary over a landscape.

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Additional Information:©2007 The American Physical Society (Received 19 April 2007; published 6 August 2007) The authors thank Stearl Phinney, Jonathan Pritchard, Scott Thomas, and Andrei Linde for helpful discussions. This work was supported by the U.S. Department of Energy under contracts No. DE-FG03-92ER40689 and No. DE-FG03-92ER40701.
Subject Keywords:cosmology; gravitation
Issue or Number:4
Record Number:CaltechAUTHORS:GRAprd07
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:8444
Deposited By: Archive Administrator
Deposited On:13 Aug 2007
Last Modified:08 Nov 2021 20:50

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