Scalaron dark matter in R²-corrected F(R) gravity satisfies current BBN helium bounds and yields a new bound α ≲ 2×10^5 GeV^-2 on the R² coupling.
Dark Matter in logarithmic $F(R)$ gravity
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abstract
The logarithmic $R^2$-corrected $F(R)$ gravity is investigated as a prototype model of modified gravity theories with quantum corrections. By using the auxiliary field method, the model is described by the general relativity with a scalaron field. The scalaron field can be identified as an inflaton at the primordial inflation era. It is also one of the dark matter candidates in the dark energy era. It is found that a wide range of the parameters is consistent with the current observations of CMB fluctuations, dark energy and dark matter.
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Big Bang Nucleosynthesis Hunts Chameleon Dark Matter
Scalaron dark matter in R²-corrected F(R) gravity satisfies current BBN helium bounds and yields a new bound α ≲ 2×10^5 GeV^-2 on the R² coupling.