Gravitational Rainbow

Abstract

It is shown that unlike Einstein's gravity quadratic gravity produces dispersive photon propagation. The energy-dependent contribution to the deflection of photons passing by the Sun is computed and subsequently the angle at which the visible spectrum would be spread over is plotted as a function of the $R_{\mu \nu }^2-$sector mass.

7 pages, 1 figure, LaTex. To appear in Phys. Rev. D

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• Comparison of QG-Induced Dispersion with Standard Physics Effects
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• Renormalizability, vDVZ discontinuity and Newtonian singularity in higher-derivative gravity
• Metric-scalar gravity with torsion and the measurability of the non-minimal coupling
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