Maximal families of Gorenstein algebras

Author:

Kleppe Jan

Abstract

The purpose of this paper is to study maximal irreducible families of Gorenstein quotients of a polynomial ring R R . Let GradAlg H ( R ) \operatorname {GradAlg}^H(R) be the scheme parametrizing graded quotients of R R with Hilbert function H H . We prove there is a close relationship between the irreducible components of GradAlg H ( R ) \operatorname {GradAlg}^H(R) , whose general member is a Gorenstein codimension ( c + 1 ) (c+1) quotient, and the irreducible components of GradAlg H ( R ) \operatorname {GradAlg}^{H’}(R) , whose general member B B is a codimension c c Cohen-Macaulay algebra of Hilbert function H H’ related to H H . If the Castelnuovo-Mumford regularity of the Gorenstein quotient is large compared to the Castelnuovo-Mumford regularity of B B , this relationship actually determines a well-defined injective mapping from such “Cohen-Macaulay” components of GradAlg H ( R ) \operatorname {GradAlg}^{H’}(R) to “Gorenstein” components of GradAlg H ( R ) \operatorname {GradAlg}^{H}(R) , in which generically smooth components correspond. Moreover the dimension of the “Gorenstein” components is computed in terms of the dimension of the corresponding “Cohen-Macaulay” component and a sum of two invariants of B B . Using linkage by a complete intersection we show how to compute these invariants. Linkage also turns out to be quite effective in verifying the assumptions which appear in a generalization of the main theorem.

Publisher

American Mathematical Society (AMS)

Subject

Applied Mathematics,General Mathematics

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