Dartmouth Events

Current estimations of cosmological parameters depend often on assumptions about the cosmological model itself. The estimates of H0 or Ωm from CMB surveys, for instance, are valid only assuming a particular model, typically the standard ΛCDM. 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 η by combining in a model-independent way several observational probes, from redshift distortions, to lensing, to matter clustering.