English

Tamely ramified subfields of division algebras

Rings and Algebras 2012-10-02 v2 Number Theory

Abstract

For any number field K, it is unknown which finite groups appear as Galois groups of extensions L/K such that L is a maximal subfield of a division algebra with center K (a K-division algebra). For K=Q, the answer is described by the long standing Q-admissibility conjecture. We extend a theorem of Neukirch on embedding problems with local constraints in order to determine for every number field K, what finite solvable groups G appear as Galois groups of tame maximal subfields of K-division algebras, generalizing Liedahl's theorem for metacyclic G and Sonn's solution of the Q-admissibility conjecture for solvable groups.

Keywords

Cite

@article{arxiv.0904.3772,
  title  = {Tamely ramified subfields of division algebras},
  author = {Danny Neftin},
  journal= {arXiv preprint arXiv:0904.3772},
  year   = {2012}
}