Bianconi-Barabási Fitness Network: Winner-Takes-All

The Barabási-Albert model grows scale-free networks via preferential attachment — rich get richer. Bianconi and Barabási added node fitness η, drawn from a distribution. When fitness variance is high, a fittest-gets-all phase emerges (Bose-Einstein condensation on networks): one supremely fit node captures a finite fraction of all links, suppressing the scale-free degree distribution.

Fitness spread: 0.5
Links per node m: 2
Growth rate: 3
Growing...
Node size = degree. Color = fitness (gold=high, blue=low). Watch for condensation.