Abstract
In this paper, we discuss a p-adic analogue of the Picard?Lefschetz formula. For a family with ordinary double points over a complete discrete valuation ring of mixed characteristic (0,p), we construct vanishing cycle modules which measure the difference between the rigid cohomology groups of the special fiber and the de Rham cohomology groups of the generic fiber. Furthermore, the monodromy operators on the de Rham cohomology groups of the generic fiber are described by the canonical generators of the vanishing cycle modules in the same way as in the case of the l-adic (or classical) Picard?Lefschetz formula. For the construction and the proof, we use the logarithmic de Rham?Witt complexes and those weight filtrations investigated by Mokrane
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