English

On the modularity of 2-adic potentially semi-stable deformation rings

Number Theory 2021-03-23 v3

Abstract

Using pp-adic local Langlands correspondence for GL2(Q2)\operatorname{GL}_2(\mathbb{Q}_2) and an ordinary R=TR = \mathbb{T} theorem, we prove that the support of patched modules for quaternionic forms meet every irreducible component of the potentially semi-stable deformation ring. This gives a new proof of the Breuil-M\'{e}zard conjecture for 2-dimensional representations of the absolute Galois group of Q2\mathbb{Q}_2, which is new in the case r\overline{r} a twist of an extension of the trivial character by itself. As a consequence, a local restriction in Pa\v{s}k\=unas' proof of Fontaine-Mazur conjecture is removed.

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Cite

@article{arxiv.1908.06174,
  title  = {On the modularity of 2-adic potentially semi-stable deformation rings},
  author = {Shen-Ning Tung},
  journal= {arXiv preprint arXiv:1908.06174},
  year   = {2021}
}

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Final version

R2 v1 2026-06-23T10:49:33.116Z