Ratio of the matter power spectra P(k) of different f(R) models, including neutrinos of different mass, with respect to ΛCDM. The different f(R) models, labelled as f4(R), f5(R), and f6(R), are described in the text. f6(R) with any neutrino mass and f5(R) with mν = 0.15 eV all have a matter power spectrum within 10% of the ΛCDM one. In the following we illustrate how different statistics can be used (or not) to discriminate these models, showing complete results in particular for f5(R) for illustration.
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