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Exponential gravity with logarithmic corrections in the presence of axion dark matter
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abstract
An exponential modified gravity with additional logarithmic corrections is considered with the presence of an axion-like scalar field in the role of dark matter. Axion fields are thought to become important at late-times when the axion-like scalar field oscillates around its vacuum expectation value, mimicking dark matter behaviour. The model is compared with the usual pressureless fluid description of dark matter. Both models are tested with observational data including some of the latest sources, providing similar fits in comparison with the $\Lambda$CDM model. Despite results are not statistically relevant to rule out any model, the number of free parameters still favours $\Lambda$CDM model, as shown by computing the goodness of the fits.
Forward citations
Cited by 2 Pith papers
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Exponential $f(R)$ cosmology with massive neutrinos as a dynamical dark energy framework
Exponential f(R) gravity with massive neutrinos fits current expansion data about as well as ΛCDM and yields slightly different H0 and Σmν constraints, but does not eliminate the Hubble tension.
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Modified gravity/Dynamical Dark Energy vs $\Lambda$CDM: is the game over?
An AIC/χ² comparison of exponential F(R) gravity, wCDM, and CPL models against Pantheon+, DESI DR1, cosmic chronometer, and Planck-compressed data claims ΛCDM is excluded at 4σ, but the significance conversion is not ...
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