Phys. Rev. Lett. 100, 111101 (2008) [4 pages]Does the Planck Mass Run on the Cosmological-Horizon Scale?Received 23 August 2007; published 18 March 2008 Einstein’s theory of general relativity contains a universal value of the Planck mass. However, one may envisage that in alternative theories of gravity the effective value of the Planck mass (or Newton’s constant), which quantifies the coupling of matter to metric perturbations, can run on the cosmological-horizon scale. In this Letter, we study the consequences of a glitch in the Planck mass from subhorizon to superhorizon scales. We show that current cosmological observations severely constrain this glitch to less than 1.2%. © 2008 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.100.111101
DOI:
10.1103/PhysRevLett.100.111101
PACS:
04.50.Kd, 04.80.Cc, 98.80.Es
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