Perturbative Quantum Gravity Induced Scalar Coupling to Electromagnetism

Abstract

Physicists working on atom interferometers are interested in scalar couplings to electromagnetism of dimensions 5 and 6 which might be induced by quantum gravity. There is a widespread belief that such couplings can only be induced by conjectured non-perturbative effects, resulting in unknown coupling strengths. In this letter we exhibit a completely perturbative mechanism through which quantum gravity induces dimension six couplings with precisely calculable coefficients.

arXiv comment7 pages, no figures, uses LaTeX2e. Version 2 slightly revised for publication

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• Summing Gravitational Effects from Loops of Inflationary Scalars