Cosmological constant and quantum gravitational corrections to the running fine structure constant

Details Cosmological constant and quantum gravitational corrections to the running fine structure constant Cosmological constant and quantum gravitational corrections to the running fine structure constant

2008-09-23

arxiv.org/abs/0809.3897v1

Phys.Rev.Lett.101:131301,2008

Physics

High Energy Physics

High Energy Physics - Theory

4 pages, RevTex, to appear in Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.101.131301

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 re-opens the possibility, suggested by Robinson and Wilczek, of altering the scaling behaviour 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.

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