Integral filtered Sen theory and applications

We study Nygaard-, conjugate-, and Hodge filtrations on the many variants of Breuil–Kisin modules associated to integral semi-stable Galois representations. This leads to an integral Sen operator satisfying certain $1$-degree shrinking" on the increasing conjugate filtration, and (in special cases) a mod $p$ Sen operator satisfying certain $p$-degree shrinking". These constructions are related with prismatic $F$-crystals, Hodge–Tate crystals and $F$-gauges, and have explicit relations with classical (non-prismatic) operators. As applications, we obtain vanishing and torsion bound results on graded of the integral Hodge filtration; our explicit methods also recover results of Gee–Kisin and Bhatt–Gee–Kisin concerning the mod $p$ Hodge filtrations and Frobenius structures.