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Light scalaron as dark matter
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abstract
A new cosmological scenario is proposed in which a light scalaron of $f (R)$ gravity plays the role of dark matter. In this scenario, the scalaron initially resides at the minimum of its effective potential while the electroweak symmetry is unbroken. At the beginning of the electroweak crossover, the evolving expectation value of the Higgs field triggers the evolution of the scalaron due to interaction between these fields. After the electroweak crossover, the oscillating scalaron can represent cold dark matter. Its current energy density depends on a single free parameter, the scalaron mass $m$, and the value $m \simeq 4 \times 10^{-3}\, \text{eV}$ is required to explain the observed dark-matter abundance. Larger mass values would be required in scenarios where the scalaron is excited before the electroweak crossover.
Forward citations
Cited by 4 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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Scalaron dark matter dynamics: effects of Higgs non-minimal coupling to gravity
Adding Higgs non-minimal coupling ξ modifies the scalaron-Higgs trilinear term, yielding scalaron dark matter masses in 2.7 meV–0.7 MeV (misalignment case) or 3.6 meV–770 meV (interaction-dominated cases) plus an LHC-...
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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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