703 citations · 1.2k across the 11 of their papers we have counts for
4 papers · 1 filter
Self-Organized Criticality and Punctuated Equilibria
Per Bak, Stefan Boettcher
Many natural phenomena evolve intermittently, with periods of tranquillity interrupted by bursts of activity, rather than following a smooth gradual path. Examples include earthqua…
Price Variations in a Stock Market With Many Agents
P. Bak, M. Paczuski, M. Shubik
Large variations in stock prices happen with sufficient frequency to raise doubts about existing models, which all fail to account for non-Gaussian statistics. We construct simple…
Mass Extinctions vs. Uniformitarianism in Biological Evolution
Per Bak, Maya Paczuski
It is usually believed that Darwin's theory leads to a smooth gradual evolution, so that mass extinctions must be caused by external shocks. However, it has recently been argued th…
Democratic Reinforcement: Learning via Self-Organization
Dimitris Stassinopoulos, Per Bak
The problem of learning in the absence of external intelligence is discussed in the context of a simple model. The model consists of a set of randomly connected, or layered integra…