Self-organized Critical Model Of Biological Evolution
  A punctuated equilibrium model of biological evolution with relative fitness between different species being the fundamental driving force of evolution is introduced. Mutation is modeled as a fitness updating cellular automaton process where the change in fitness after mutation follows a Gaussian distribution with mean $x>0$ and standard deviation $\sigma$. Scaling behaviors are observed in our numerical simulation, indicating that the model is self-organized critical. Besides, the numerical experiment suggests that models with different $x$ and $\sigma$ belong to the same universality class. PACS numbers: 87.10.+e, 05.40.+j 
H.F. Chau (Dept of Phys, U of Illinois & School of Nat. Sci., Inst.   for Adv. Study), L. Mak (Coordinated Sci. Lab., U of I...