Recently signals appeared from various sides (AdS/CFT, condensed matter
experiment and -numerics) making me wonder whether a simple general
principle might be at work in strongly interacting finite density
fermion systems which cannot be handled by conventional technology
because of the sign problem. Very different from classical- or bosonic
systems this would amount to a generic capacity to generate in the
infrared larger global symmetries than are present in the UV, without
invoking fine tuning.
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