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MINI-COURSE ON METASTABILITY 1

Metastability is a ubiquitous phenomenon in nature, with examples coming from physics, chemistry, biology, climatology and economics. The objects of interest are systems that make transitions between “metastable states”, i.e., quasi-equilibria that appear to be equilibria, but are not, and the stable state. Metastable behavior is characterized by a long period of apparent equilibrium of a pure thermodynamical phase followed by an unexpected fast decay towards the stable equilibrium of a pure phase or a mixture. Consider the system in the metastable state and let the system evolve according to random dynamics. Interesting questions in metastability are: