publiée le 10 avril 2024
Non-minimal coupling, negative null energy, and effective field theory
De Eleni-Alexandra Kontou
Model-independent cosmology
Apparaît dans la collection : Theory of Gravitation and Variation in Cosmology / Théorie de la gravitation et variations en cosmologie
Current estimations of cosmological parameters depend often on assumptions about the cosmological model itself. The estimates of $H_{0}$ or $\Omega_{m}$ from CMB surveys, for instance, are valid only assuming a particular model, typically the standard $\Lambda$CDM. Similar model-dependent results are obtained also from analyses of large-scale structure. In some case it is however possible to combine observations in such a way to get estimates of physical quantities that are valid regardless (to some extent) of the underlying model. Here I will discuss how one can determine the cosmological expansion rate $H(z)$ and the deviation from Einstein gravity $\eta$ by combining in a model-independent way several observational probes, from redshift distortions, to lensing, to matter clustering.
