Zig-zag for Galois Representations

TL;DR

This paper proves the zig-zag conjecture for the mod p reductions of certain crystalline Galois representations of Q_p with large weights and slopes, confirming an alternating pattern of irreducible and reducible cases.

Contribution

It establishes the zig-zag conjecture for a broad class of Galois representations by employing a limiting argument and existing theoretical results.

Findings

Confirmed the zig-zag pattern in reductions of crystalline representations

Extended the conjecture's validity to large weights and slopes for p ≥ 5

Utilized a limiting approach to connect to semi-stable cases

Abstract

The zig-zag conjecture says that the reductions of two-dimensional crystalline representations of the Galois group of ${\mathbb {Q}}_p$ of large exceptional weights and half-integral slopes up to $\frac{p-1}{2}$ vary through an alternating sequence of irreducible and reducible mod $p$ representations. We prove this conjecture in smoothly varying families of such representations for $p \geq 5$. The proof uses a limiting argument due to Chitrao-Ghate-Yasuda to reduce to the case of semi-stable representations of weights at most $p+1$, and then appeals to the work of Breuil-M\'ezard, Guerberoff-Park and Chitrao-Ghate.