Worm Algorithm —
Ising Model
Prokof'ev-Svistunov worm updates — efficient Monte Carlo near criticality
Controls
Temperature T/J
Cold
2.27
Hot
T_c ≈ 2.269 (Onsager)
Grid size
40
Steps/frame
20
Reset Lattice
Cold Start (↑)
Observables
0
|m|
0
⟨E⟩/N
0
Worm len
0
MCS×10³
Legend
Spin ↓ (−1)
Spin ↑ (+1)
Worm head (Ira)
Worm tail (Masha)
Worm path
The worm traces non-local updates in the high-T expansion, dramatically reducing critical slowing down.