A note on logarithmic growth Newton polygons of $p$-adic differential equations

Abstract

In this paper, we answer a question due to Y. André related to B. Dwork's conjecture on a specialization of the logarithmic growth of solutions of $p$-adic linear differential equations. Precisely speaking, we explicitly construct a $\nabla$-module $M$ over ${\mathbb{Q}}_p[[X]{]}_0$ of rank 2 such that the left endpoint of the special log-growth Newton polygon of $M$ is strictly above the left endpoint of the generic log-growth Newton polygon of $M$.

arXiv comment5 pages; v2: refereed version: expanded introduction; to appear in IMRN