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DOI: 10.3390/universe9010013

The Effective Fluid approach for Modified Gravity and its applications

Savvas Nesseris
Dec 2022
摘要
In this review we briefly summarize the so-called effective fluid approach,which is a compact framework that can be used to describe a plethora ofdifferent modified gravity models as general relativity (GR) and a dark energy(DE) fluid. This approach, which is complementary to the cosmological effectivefield theory, has several benefits as it allows for the easier inclusion ofmost modified gravity models into the state-of-the-art Boltzmann codes, thatare typically hard-coded for GR and DE. Furthermore, it can also providetheoretical insights into their behavior, since in linear perturbation theoryit is easy to derive physically motivated quantities such as the DE anisotropicstress or the DE sound speed. We also present some explicit applications of theeffective fluid approach with $f(R)$, Horndeski and Scalar-Vector-Tensormodels, namely how this approach can be used to easily solve the perturbationequations and incorporate the aforementioned modified gravity models intoBoltzmann codes so as to obtain cosmological constraints using Monte Carloanalyses.
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