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class groups of unramified cyclic p-extensions of imaginary quadratic fields

Then I am looking for heuristics on $ker(N_{L/K}:A(L)\rightarrow A(K))$, where $N_{L/K}$ is the usual norm map on ideal classes. … There is a result by Wittmann who gives some heuristics for cyclic $p$-extensions of $\mathbb{Q}$ and I wonder if one can possibly generalize his ideas to the above scenario. …