Constructing modules with prescribed cohomological support
Avramov, Luchezar L. ; Iyengar, Srikanth B.
Illinois J. Math., Tome 51 (2007) no. 3, p. 1-20 / Harvested from Project Euclid
A cohomological support, $\operatorname{Supp}^*_{\mathcal A}(M)$, is defined for finitely generated modules $M$ over a left noetherian ring $R$, with respect to a ring $\mathcal A$ of central cohomology operations on the derived category of $R$-modules. It is proved that if the $\mathcal A$-module $\operatorname{Ext}^*_R(M,M)$ is noetherian and $\operatorname{Ext}^*_R(M,R)=0$ for $i\gg0$, then every closed subset of $\operatorname{Supp}^*_{\mathcal A}(M)$ is the support of some finitely generated $R$-module. This theorem specializes to known realizability results for varieties of modules over group algebras, over local complete intersections, and over finite dimensional algebras over a field. The theorem is also used to produce large families of finitely generated modules of finite projective dimension over commutative local noetherian rings.
Publié le : 2007-01-15
Classification:  13D25,  13D05,  13H10
@article{1258735320,
     author = {Avramov, Luchezar L. and Iyengar, Srikanth B.},
     title = {Constructing modules with prescribed cohomological support},
     journal = {Illinois J. Math.},
     volume = {51},
     number = {3},
     year = {2007},
     pages = { 1-20},
     language = {en},
     url = {http://dml.mathdoc.fr/item/1258735320}
}
Avramov, Luchezar L.; Iyengar, Srikanth B. Constructing modules with prescribed cohomological support. Illinois J. Math., Tome 51 (2007) no. 3, pp.  1-20. http://gdmltest.u-ga.fr/item/1258735320/