Aspects of the irregular Hodge filtration
Claude Sabbah (Ecole Polytechnique, Paris)  Seminar Algebraische Geometrie (SAG)
What 


When 
Oct 17, 2013 from 10:30 am to 11:30 am 
Where  Bonn, Hörsaal MPI, Vivatsgasse 7 
Contact Name  Sachinidis 
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(Joint work with Hélčne Esnault and JengDaw Yu:)
Given a regular function f on a smooth quasiprojective variety U,
the de Rham complex of U relative to the twisted differential d+df
can be equipped canonically with a filtration (the irregular Hodge
filtration) for which the associated hypercohomology spectral
sequence degenerates at E1. A logarithmic version of this de Rham
complex (relative to a suitable compactification of U) has been
introduced by M. Kontsevich, who showed the independence of the
dimension of the corresponding cohomologies with respect to the
differential ud+vdf, for u,v arbitrary complex numbers. This leads
to bundles on the projective line of the (u:v) variable, on which we
construct a natural connection for which the HarderNarasimhan
filtration satisfies the Griffiths transversality property and
standard limiting properties at v=0.