"Applications of delay differential equations"
I wanted to make a CW question (by the way, how to do it?).
Being interested in the mathematical theory, I was wondering if there are up-to-date, nontrivial models/theories where delay differential equations play a role (PDE-s, or more general functional differential equations).
It is clear that
-in biological (population) models usually pregnancy introduces a delay term, or
-in disease transition in networks the latent period introduces a delay, or
-in engineering in feedback problems signal processing introduces the time delay.
Would a question like this be acceptable on this site? I would like to see a list of answers where each answer contains one reference.
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