Unraveling the effective fluid approach for f ( R ) models in the subhorizon approximation
作者： Rubén Arjona , Wilmar Cardona , Savvas Nesseris
DOI: 10.1103/PHYSREVD.99.043516
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摘要: We provide explicit formulas for the effective fluid approach of $f(R)$ theories, such as HuandSawicki and designer models. Using latter simple modifications to class code, which we call EFCLASS, in conjunction with very accurate analytic approximations background evolution, obtain competitive results a much simpler less error-prone approach. also derive initial conditions matter domination, find they differ from those already found literature constant $w$ model. A clear example is model that behaves $\mathrm{\ensuremath{\Lambda}}\mathrm{CDM}$ but has nonetheless dark energy perturbations. then use aforementioned models constraints latest cosmological data, including supernovae, BAO, CMB, $H(z)$ growth-rate are statistically consistent Finally, show viscosity parameter ${c}_{\mathrm{vis}}^{2}$ realistic not commonly assumed rather evolves significantly over several orders magnitude, something could affect forecasts upcoming surveys.
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