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Modified gravity and dark matter
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The fundamental nature of Dark Matter (DM) has not been established. Indeed, beyond its gravitational effects, DM remains undetected by present experiments. In this situation, it is reasonable to wonder if other alternatives can effectively explain the observations usually associated with the existence of DM. The modification of the gravitational interaction has been studied in this context from many different approaches. However, the large amount of different astrophysical evidences makes difficult to think that modified gravity can account for all these observations. On the other hand, if such a modification introduces new degrees of freedom, they may work as DM candidates. We will summarize the phenomenology of these gravitational dark matter candidates by analyzing minimal models.
Forward citations
Cited by 3 Pith papers
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Effective scalaron--photon interaction in $f(R)$ gravity
In the Jordan-frame treatment of f(R) gravity the scalaron-photon effective coupling vanishes for m much less than loop-particle masses because the classical-trace diagrams cancel the Fujikawa anomaly term.
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Interactions of the scalaron dark matter in $f (R)$ gravity
For scalaron dark matter in f(R) gravity, the two-photon decay rate is confirmed at one loop, the resulting extragalactic background spectrum is derived, and the thermal scalaron abundance is shown to be negligible.
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Universality in static spherically symmetric solutions of f(R) gravity
Static spherically symmetric vacuum solutions of three f(R) models have universal rescaled scalaron and metric-alpha profiles for large Mµ, with common near-center asymptotics ζ=1.
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