  The properties of axion miniclusters and of the voids between them can have
very strong implications for the discovery of axions and the dark matter of the
Universe. These properties can be strongly affected by axion dynamics in the
early Universe, such as the axion string network and the non-linear dynamics
around the QCD phase transition. Recently, improvements in numerical simulation
techniques have allowed us to calculate the dark matter axion field from axion
strings and QCD effects using different methods: directly with low-tension
strings but high resolution, directly with effective high-tension strings, or
indirectly by extrapolating an attractor solution. In this work, we study the
properties of miniclusters in the different approaches used in the literature.
We find that, while there are substantial differences in the mass distribution
and internal density profiles, globally there is a similar energy distribution
between minicluster halos and voids.
