A prediction for anisotropies in the nearby Hubble flow

Understand

We assess the dominant low-redshift anisotropic signatures in the distance-redshift relation and redshift drift signals.

• We adopt general-relativistic irrotational dust models allowing for gravitational radiation -- the `quiet universe models' -- which are extensions of the silent universe models.
• Using cosmological simulations evolved with numerical relativity, we confirm that the quiet universe model is a good description on scales larger than those of collapsing structures.
• With this result, we reduce the number of degrees of freedom in the fully general luminosity distance and redshift drift cosmographies by a factor of $\sim 2$ and $\sim 2.5$, respectively, for the most simplified case.