CONCEPT
Avalanche Dynamics
The cascading reorganization triggered when a perturbation in a critical system propagates through chains of interaction — governed by the pile's global state rather than the triggering grain's properties.
Avalanche dynamics describe how perturbations propagate in systems at criticality. A single grain shifting on a critical sandpile destabilizes its neighbors. Each destabilized neighbor shifts and destabilizes its own neighbors. The cascade expands through chains of contact, with its ultimate size determined not by the triggering grain but by the configuration of the surrounding grains and the system's correlation length. In subcritical systems, avalanches are small and local — absorbed by friction before propagating far. At criticality, avalanches follow a power-law distribution: many small, fewer medium, rare large, with no upper bound on possible size. The December 2025 AI capability threshold, the SaaS Death Cross, and individual career disruptions are avalanches at different scales in the same critical system, governed by the same dynamics and connected through the diverged correlation length.
In The You On AI Field Guide
The physics of avalanche propagation depends critically on the pile's state. In a subcritical pile, where the slope is below the critical angle, most grains