2,117 research outputs found
Weight-monodromy conjecture over equal characteristic local fields
The aim of this paper is to study certain properties of the weight spectral
sequences of Rapoport-Zink by a specialization argument. By reducing to the
case over finite fields previously treated by Deligne, we prove that the weight
filtration and the monodromy filtration defined on the -adic \'etale
cohomology coincide, up to shift, for proper smooth varieties over equal
characteristic local fields. We also prove that the weight spectral sequences
degenerate at in any characteristic without using log geometry. Moreover,
as an application, we give a modulo reduction proof of a Hodge analogue
previously considered by Steenbrink.Comment: 12 pages, AMS LaTeX, revised version, to appear in the American
Journal of Mathematic
Weight-monodromy conjecture for certain threefolds in mixed characteristic
The weight-monodromy conjecture claims the coincidence of the weight
filtration and the monodromy filtration, up to shift, on the -adic \'etale
cohomology of a proper smooth variety over a complete discrete valuation field.
Although it has been proved in some cases, the case of dimension in
mixed characteristic is still open so far. The aim of this paper is to give a
proof of the weight-monodromy conjecture for a threefold which has a projective
strictly semistable model such that, for each irreducible component of the
special fiber, the Picard number is equal to the second -adic Betti number.
Our proof is based on a careful analysis of the weight spectral sequence of
Rapoport-Zink by the Hodge index theorem for surfaces. We also prove a -adic
analogue by using the weight spectral sequence of Mokrane.Comment: 16 pages, Example 1.3 added, minor modifications, to appear in IMR
Plan of advanced satellite communication experiments using ETS-6
In 1992, an Engineering Test Satellite 6 is scheduled to be launched by an H-2 rocket. The missions of ETS-6 are to establish basic technologies of inter-satellite communications using S-band, millimeter waves and optical beams and of fixed and mobile satellite communications using multibeam antenna on board the satellite. A plan of the experiments is introduced
- …