English

Large images of reducible galois representations

Number Theory 2016-11-10 v1

Abstract

Given a reducible Galois representation ρ:GQGL2(Fq)\overline{\rho}: G_{\mathbb{Q}} \rightarrow GL_2( \mathbb{F}_q) we show there exists an irreducible deformation ρ:GQGL2(W[[T1,T2,..,Tr,....,]])\rho : G_{\mathbb{Q}} \rightarrow GL_2 (\mathbb{W} [[T_1, T_2,.., T_r,....,]]) of ρ\overline{\rho} ramified at infinitely many primes, where W\mathbb{W} denotes the ring of Witt vectors of Fq\mathbb{F}_q. This is a modification of Ramakrishna's result for the irreducible case.

Keywords

Cite

@article{arxiv.1611.03045,
  title  = {Large images of reducible galois representations},
  author = {Aftab Pande},
  journal= {arXiv preprint arXiv:1611.03045},
  year   = {2016}
}

Comments

To appear in Revista de la Uni\'on Matem\'atica Argentina