Abstract
Many gauge theory models on fuzzy complex projective spaces will contain a strong instability in the quantum field theory leading to topology change. This can be thought of as due to the interaction between space–time via its noncommutativity and the fields (matrices) and it is related to the perturbative UV–IR mixing. We work out in detail the example of fuzzy CP 2 and discuss at the level of the phase diagram the quantum transitions between the 3 spaces (space–times) CP 2 , S 2 and the 0-dimensional space consisting of a single point { 0 } .
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