Annihilators for the class group of a cyclic field of prime power degree II

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Authors

GREITHER Cornelius KUČERA Radan

Year of publication 2006
Type Article in Periodical
Magazine / Source Canadian Journal of Mathematics
MU Faculty or unit

Faculty of Science

Citation
Field General mathematics
Keywords Class group; annihilators; cyclic number field
Description We prove, for a field K which is cyclic of odd prime power degree over the rationals, that the annihilator of the quotient of the units of K by a suitable large subgroup (constructed from circular units) annihilates what we call the non-genus part of the class group. This leads to stronger annihilation results for the whole class group than a routine application of the Rubin-Thaine method would produce, since the part of the class group determined by genus theory has an obvious large annihilator which is not detected by that method; this is our reason for concentrating on the non-genus part. The present work builds on and strengthens previous work of the authors; the proofs are more conceptual now, and we are also able to construct an example which demonstrates that our results cannot be easily sharpened further.
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