Parabolic log convergent isocrystals

Atsushi Shiho

Published 2010-10-21, updated 2012-06-26Version 2

In this paper, we introduce the notion of parabolic log convergent isocrystals on smooth varieties endowed with a simple normal crossing divisor, which is a kind of $p$-adic analogue of the notion of parabolic bundles on smooth varieties defined by Seshadri, Maruyama-Yokogawa, Iyer-Simpson, Borne. We prove that the equivalence between the category of $p$-adic representations of the fundamental group and the category of unit-root convergent $F$-isocrystals (proven by Crew) induces the equivalence between the category of $p$-adic representations of the tame fundamental group and the category of unit-root semisimply adjusted parabolic log convergent $F$-isocrystals. We also prove equivalences which relate categories of log convergent isocrystals on certain fine log algebraic stacks with some conditions and categories of adjusted parabolic log convergent isocrystals with some conditions. We also give an interpretation of unit-rootness in terms of the generic semistability with slope 0. Our result can be regarded as a $p$-adic analogue of the results of Seshadri, Mehta-Seshadri, Iyer-Simpson and Borne.