  We show that diffusion due to chaotic mixing in the Neighbourhood of the Sun
may not be as relevant as previously suggested in erasing phase space
signatures of past Galactic accretion events. For this purpose, we analyse
Solar Neighbourhood-like volumes extracted from cosmological simulations that
naturally account for chaotic orbital behaviour induced by the strongly
triaxial and cuspy shape of the resulting dark matter haloes, among other
factors. In the approximation of an analytical static triaxial model, our
results show that a large fraction of stellar halo particles in such local
volumes have chaos onset times (i.e., the timescale at which stars commonly
associated with chaotic orbits will exhibit their chaotic behaviour)
significantly larger than a Hubble time. Furthermore, particles that do present
a chaotic behaviour within a Hubble time do not exhibit significant diffusion
in phase space.

Astrophysics of Galaxies;Chaotic Dynamics