Locally Cold Flows from Large-Scale Structure

Understand

We show that the "cold" Hubble flow observed for galaxies around the Milky Way does not represent a problem in cosmology but is due to the particular geometry and dynamics of our local wall.

• The behavior of the perturbed Hubble flow around the Milky Way is the result of two main factors: at small scales (R < 1 Mpc) the inflow is dominated by the gravitational influence of the Milky Way.
• At large scales (R > 1 Mpc) the out flow reflects the expansion of our local wall which &#34;cools down&#34; the peculiar velocities.
• This is an intrinsic property of walls and is independent of cosmology.