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AN ANALOGUE OF THE FIELDOFNORMS FUNCTOR AND OF THE GROTHENDIECK CONJECTURE
 

Summary: AN ANALOGUE OF THE FIELD­OF­NORMS FUNCTOR
AND OF THE GROTHENDIECK CONJECTURE
Victor Abrashkin
Abstract. The paper contains a construction of an analogue of the Fontaine­Wintenberger
field­of­norms functor for higher dimensional local fields. This construction is done
completely in terms of the ramification theory of such fields. It is applied to deduce
the mixed characteristic case of a local analogue of the Grothendieck Conjecture for
these fields from its characteristic p case, which was proved earlier by the author.
0. Introduction.
Throughout all this paper p is a fixed prime number.
The field­of­norms functor [FW1,2] allows to identify the Galois groups of some
infinite extensions of Q p with those of complete discrete valuation fields of char­
acteristic p. This functor is an essential component of Fontaine's theory of #­#­
modules --- one of most powerful tools in the modern study of p­adic representations.
Other areas of very impressive applications are the Galois cohomology of local fields
[He], arithmetic aspects of dynamical systems [LMS], explicit reciprocity formulae
[Ab2,3], [Ben], a description of the structure of ramification filtration [Ab7], the
proof of an analogue of the Grothendieck Conjecture for 1­dimensional local fields
[Ab4].
A local analogue of the Grothendieck Conjecture establishes an opportunity to

  

Source: Abrashkin, Victor - Department of Mathematical Sciences, University of Durham

 

Collections: Mathematics