Redshift drift cosmography for model-independent cosmological inference

Understand

We develop a cosmographic framework for analysing redshift drift signals of nearby sources model-independently, i.e., without making assumptions about the metric description of the Universe.

• We show that the Friedmann-Lema\^{\i}tre-Robertson-Walker (FLRW) prediction is altered nontrivially by regional anisotropies and inhomogeneities.
• In particular, we find that the position drift of the sources is nontrivially linked to the redshift drift signal.
• The redshift drift signal for nearby sources might be formulated in terms of an effective deceleration parameter, which reduces to the FLRW deceleration parameter in the homogeneous and isotropic limit.