Phys. Rev. Lett. 101, 131301 (2008) [4 pages]Cosmological Constant and Quantum Gravitational Corrections to the Running Fine Structure ConstantReceived 5 March 2008; revised 28 July 2008; published 25 September 2008 The quantum gravitational contribution to the renormalization group behavior of the electric charge in Einstein-Maxwell theory with a cosmological constant is considered. Quantum gravity is shown to lead to a contribution to the running charge not present when the cosmological constant vanishes. This reopens the possibility, suggested by Robinson and Wilczek, of altering the scaling behavior of gauge theories at high energies although our result differs. We show the possibility of an ultraviolet fixed point that is linked directly to the cosmological constant. © 2008 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.101.131301
DOI:
10.1103/PhysRevLett.101.131301
PACS:
12.10.Kt, 04.60.−m, 11.10.Hi, 11.15.−q
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