Research of the inverse Galois problems with restricted ramifications and their applications

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Frohlich proved that for any p-group G, there exists a number field k and the unramified Galois extension K/k such that the Galois group is isomorphic to G. In Frohlich's method, the degree of the base field k is high in general. We wanted to reduce the degree of the base field k as much as possible. And we proved that the base field k can be chosen as elementary abelian p-extension over the rational number field. As a corollary of the theorem, we proved that there exists an elementary abelian p-extension such that the ideal class group contains an element of big order.