Open Access
Table 1
Summary of the main parameters used to run AVISM.
| Parameter | Symbol | Value (default) | Description |
|---|---|---|---|
| Grid | |||
| Minimum level | ℓmin | 0 | – Coarse level for finding voids (only matters for grid-like inputs). |
| Maximum level | ℓmax | 0 | – Maximum level for finding voids. |
| Coarse (minimum level) grid size | Nx, Ny, Nz | – | – Number of cells in each direction for the grid corresponding to the coarse level. |
| Comoving box side | L0 | – | – Comoving box side in cMpc where the particles or data are placed. |
| Particle interpolation | |||
| Number of neighbours | Nngh | 32 | – Number of neighbours that contribute to each cell in the density and velocity interpolation. |
| Void thresholds | |||
| Density contrast for void centres | δ1 | −0.6 | – Density contrast threshold applied to define cells that can grow and become voids. |
| Density contrast for edges | δ2 | 10 | – Density contrast threshold to stop cube growing once the edge is found. |
| Density gradient | |∇δ|th | 0.25 cMpc−1 | – Density gradient threshold to stop cubes from growing once the gradient is too steep and close to the edges. |
| Velocity divergence threshold | ∇⋅ vth | 0 cMpc−1 c | – Velocity divergence threshold to stop cubes from growing into non-expanding regions. |
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