Institute for Advanced Study Astrophysics Seminar

Many of the natural systems we seek to understand are very complex; the Earth's climate and some biological and astrophysical systems are prime examples. Large numerical models have become increasingly powerful tools in that quest, but there can be a tendency for such models to become separate from traditional theory. Furthermore, often no theory of the behaviour of the whole system exists. What then does it mean to understand such complex systems, and how should we go about gaining that understanding? I'll discuss this problem (without providing an answer), drawing on practical experiences in climate modelling.