### Abstract

Let K be a totally real field and G_{K}:=Gal(K‾/K) its absolute Galois group, where K‾ is a fixed algebraic closure of K. Let ℓ be a prime and E a finite extension of Q_{ℓ}. Let S be a finite set of finite places of K not dividing ℓ. Assume that K, S, Hodge-Tate type h and a positive integer n are fixed. In this paper, we prove that if ℓ is sufficiently large, then, for any fixed E, there are only finitely many isomorphism classes of crystalline representations r:G_{K}→GL_{n}(E) unramified outside S∪{v:v|ℓ}, with fixed Hodge-Tate type h, such that r|_{GK′ }≃⊕r_{i} ^{′} for some finite totally real field extension K^{′} of K unramified at all places of K over ℓ, where each representation r_{i} ^{′} over E is an 1-dimensional representation of G_{K′ } or a totally odd irreducible 2-dimensional representation of G_{K′ } with distinct Hodge-Tate numbers.

Original language | English |
---|---|

Pages (from-to) | 312-329 |

Number of pages | 18 |

Journal | Journal of Number Theory |

Volume | 209 |

DOIs | |

Publication status | Published - 2020 Apr |

### Keywords

- Finiteness of Galois representations
- Potential automorphy

### ASJC Scopus subject areas

- Algebra and Number Theory

### Cite this

*Journal of Number Theory*,

*209*, 312-329. https://doi.org/10.1016/j.jnt.2019.08.023

**Finiteness for crystalline representations of the absolute Galois group of a totally real field.** / Choi, Dohoon; Choi, Suh Hyun.

Research output: Contribution to journal › Article

*Journal of Number Theory*, vol. 209, pp. 312-329. https://doi.org/10.1016/j.jnt.2019.08.023

}

TY - JOUR

T1 - Finiteness for crystalline representations of the absolute Galois group of a totally real field

AU - Choi, Dohoon

AU - Choi, Suh Hyun

PY - 2020/4

Y1 - 2020/4

N2 - Let K be a totally real field and GK:=Gal(K‾/K) its absolute Galois group, where K‾ is a fixed algebraic closure of K. Let ℓ be a prime and E a finite extension of Qℓ. Let S be a finite set of finite places of K not dividing ℓ. Assume that K, S, Hodge-Tate type h and a positive integer n are fixed. In this paper, we prove that if ℓ is sufficiently large, then, for any fixed E, there are only finitely many isomorphism classes of crystalline representations r:GK→GLn(E) unramified outside S∪{v:v|ℓ}, with fixed Hodge-Tate type h, such that r|GK′ ≃⊕ri ′ for some finite totally real field extension K′ of K unramified at all places of K over ℓ, where each representation ri ′ over E is an 1-dimensional representation of GK′ or a totally odd irreducible 2-dimensional representation of GK′ with distinct Hodge-Tate numbers.

AB - Let K be a totally real field and GK:=Gal(K‾/K) its absolute Galois group, where K‾ is a fixed algebraic closure of K. Let ℓ be a prime and E a finite extension of Qℓ. Let S be a finite set of finite places of K not dividing ℓ. Assume that K, S, Hodge-Tate type h and a positive integer n are fixed. In this paper, we prove that if ℓ is sufficiently large, then, for any fixed E, there are only finitely many isomorphism classes of crystalline representations r:GK→GLn(E) unramified outside S∪{v:v|ℓ}, with fixed Hodge-Tate type h, such that r|GK′ ≃⊕ri ′ for some finite totally real field extension K′ of K unramified at all places of K over ℓ, where each representation ri ′ over E is an 1-dimensional representation of GK′ or a totally odd irreducible 2-dimensional representation of GK′ with distinct Hodge-Tate numbers.

KW - Finiteness of Galois representations

KW - Potential automorphy

UR - http://www.scopus.com/inward/record.url?scp=85072725346&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85072725346&partnerID=8YFLogxK

U2 - 10.1016/j.jnt.2019.08.023

DO - 10.1016/j.jnt.2019.08.023

M3 - Article

AN - SCOPUS:85072725346

VL - 209

SP - 312

EP - 329

JO - Journal of Number Theory

JF - Journal of Number Theory

SN - 0022-314X

ER -