No Cosmic Rays from Curvature Oscillations during Structure Formation with $F(R)$-gravity [CEA]

The Starobinsky model of modified gravity adopted to explain dark energy may be also considered in the astrophysical context. Recently it has been pointed out that in contracting regions curvature oscillations around the GR value may lead to the production of high energy particles that contribute to the cosmic ray flux. We revisited these calculations in the Einstein frame and obtained that such curvature oscillations may decay only to soft photons.

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D. Gorbunov and A. Tokareva
Fri, 12 Dec 14

Comments: 9 pages