Observational confrontation of the Deser–Woodard nonlocal gravity model

Confront the Deser–Woodard nonlocal gravity model comprehensively with observational data to determine whether its initially identified tension with cosmological perturbation observations can be alleviated across the full set of relevant cosmological probes.

Background

The paper distinguishes the Deser–Woodard model from the Maggiore–Mancarella model studied in detail. It notes that the Deser–Woodard model modifies cosmological perturbations and was initially considered to be in tension with observations, although later work suggested that this tension might be reduced. A comprehensive observational assessment of the model is identified as unresolved.