Extending the applicability of Thermal Dynamics to Evolutionary Biology

In the past years, a remarkable mapping has been found between the dynamics of a population of M individuals undergoing random mutations and selection, and that of a single system in contact with a thermal bath with temperature 1/M. This correspondence holds under the somewhat restrictive condition that the population is dominated by a single type at almost all times, punctuated by rare successive mutations. Here we argue that such thermal dynamics will hold more generally, specifically in systems with rugged fitness landscapes. This includes cases with strong clonal interference, where a number of concurrent mutants dominate the population. The problem becomes closely analogous to the experimental situation of glasses subjected to controlled variations of parameters such as temperature, pressure or magnetic fields. Non-trivial suggestions from the field of glasses may be thus proposed for evolutionary systems - including a large part of the numerical simulation procedures - that in many cases would have been counter intuitive without this background.

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