Observational Constraints in Nonlocal Gravity: the Deser-Woodard Case

Abstract

We study the cosmology of a specific class of nonlocal model of modified gravity, the so-called Deser-Woodard (DW) model, modifying the Einstein-Hilbert action by a term $\sim Rf({\square }^{-1}R)$, where $f$ is a free function. Choosing $f$ so as to reproduce the $\Lambda \mathrm{CDM}$ cosmological background expansion history within the nonlocal model, we implement the model in a cosmological linear Einstein--Boltzmann solver and study the deviations to GR the model induces in the scalar and tensor perturbations. We observe that the DW nonlocal model describes a modified propagation for the gravitational waves, as well as a lower linear growth rate and a stronger lensing power as compared to $\Lambda \mathrm{CDM}$, up to several percents. Such prominent growth and lensing features lead to the inference of a significantly smaller value of ${\sigma }_8$ with respect to the one in $\Lambda \mathrm{CDM}$, given \textit{Planck} CMB+lensing data. The prediction for the linear growth rate $f{\sigma }_8$ within the DW model is therefore significantly smaller than the one in $\Lambda \mathrm{CDM}$ and the addition of growth rate data $f{\sigma }_8$ from Redshift-space distortion measurements to \textit{Planck} CMB+lensing, opens a (dominant) tension between Redshift-space distortion data and the reconstructed \textit{Planck} CMB lensing potential. However, model selection issues only result in "weak" evidences for $\Lambda \mathrm{CDM}$ against the DW model given the data. Such a fact shows that the datasets we consider are not constraining enough for distinguishing between the models. As we discuss, the addition of galaxy WL data or cosmological constraints from future galaxy clustering, weak lensing surveys, but also third generation gravitational wave interferometers, prove to be useful for discriminating modified gravity models such as the DW one from $\Lambda \mathrm{CDM}$, within the close future.

arXiv comment28 pages, 13 figures, v2: references added, typographical errors corrected

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