Astronomy
The cosmic web
Grow a primordial displacement field. Watch sheets and filaments emerge as initially separated matter streams approach one another.
The model and its limits
Zel’dovich first-order Lagrangian displacement in a periodic cube. The approximation ceases to describe bound structures after shell crossing; brightness is illustrative.
Equations used in the module
Equations x(q,D) = q - D∇Φ(q); ρ/ρ₀ = 1/|det(∂x/∂q)| before shell crossing
