COSMIC WEB · VOID STRUCTURE
Zel'dovich Approximation · Adhesion Model · Dark Matter Sheets
Simulation
Scale factor a(t)
0.10
Grid size N
32
Power spectrum slope
-2.0
Smoothing scale
1.5
Controls
Regenerate
Animate
Pause
Show Voids
Filaments
Nodes
Statistics
Void fraction
—
Max density
—
Caustic count
—
Scale factor a
—
Zel'dovich approximation:
x(q,a) = q − a·∇φ(q)
Particles stream along initial displacement field. Sheets cross (caustics) → filaments and halos form. Adhesion model adds viscosity ν→0 to prevent shell crossing, preserving structure. Voids expand; matter collapses to pancakes, filaments, and nodes — the cosmic web.