Per Bak
| Per Bak | |
|---|---|
| Born |
December 8, 1948 Brønderslev, Denmark |
| Died | October 16, 2002 (aged 53) Copenhagen, Denmark |
| Residence | Denmark United States UK |
| Nationality | Danish |
| Alma mater |
Technical University of Denmark Risø National Laboratory |
| Known for |
Self-organized criticality Bak–Tang–Wiesenfeld sandpile |
| Scientific career | |
| Fields | Physicist |
| Institutions |
Brookhaven National Laboratory University of Copenhagen Santa Fe Institute Niels Bohr Institute Imperial College London |
| Doctoral students |
Sergei Maslov Kim Sneppen |
Per Bak (December 8, 1948 – October 16, 2002) was a Danish theoretical physicist who coauthored the 1987 academic paper that coined the term "self-organized criticality."
After receiving his Ph.D. from the Technical University of Denmark in 1974, Bak worked at Brookhaven National Laboratory. He specialized in phase transitions, such as those occurring when an insulator suddenly becomes a conductor or when water freezes. In that context, he also did important work on complicated spatially modulated (magnetic) structures in solids. This research led him to the more general question of how organization emerges from disorder.
In 1987, he and two postdoctoral researchers, Chao Tang and Kurt Wiesenfeld, published an article in Physical Review Letters setting a new concept they called self-organized criticality. The first discovered example of a dynamical system displaying such self-organized criticality, the Bak-Tang-Wiesenfeld sandpile model, was named after them.
Faced with many skeptics, Bak pursued the implications of his theory at a number of institutions, including the Brookhaven National Laboratory, the Santa Fe Institute, the Niels Bohr Institute in Copenhagen, and Imperial College London, where he became a professor in 2000.
In 1996, he took his ideas to a broader audience with his ambitiously entitled book, How Nature Works. In 2001, Bak learned that he had myelodysplastic syndrome and died from it the following year. Bak is survived by his second wife, Maya Paczuski, a fellow physicist at Imperial College with whom he has coauthored papers, and his four children.
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