The Diversity of Core Halo Structure in the Fuzzy Dark Matter Model
  In the fuzzy dark matter (FDM) model, gravitationally collapsed objects
always consist of a solitonic core located within a virialised halo. Although
various numerical simulations have confirmed that the collapsed structure can
be described by a cored NFW like density profile, there is still disagreement
about the relation between the core mass and the halo mass. To fully understand
this relation, we have assembled a large sample of cored haloes based on both
idealised soliton mergers and cosmological simulations with various box sizes.
We find that there exists a sizeable dispersion in the core-halo mass relation
that increases with halo mass, indicating that the FDM model allows cores and
haloes to coexist in diverse configurations. We provide a new empirical
equation for a core halo mass relation with uncertainties that can encompass
all previously found relations in the dispersion, and emphasise that any
observational constraints on the particle mass using a tight one-to-one
core-halo mass relation should suffer from an additional uncertainty on the
order of 50 % for halo masses $ \ge 10^9 (8 \times 10^{-23} eV/ (mc^2))^{3/2}
M_\odot$. We suggest that tidal stripping may be one of the effects
contributing to the scatter in the relation.
