Graph products of spheres, associative graded algebras and Hilbert series

Details Graph products of spheres, associative graded algebras and Hilbert series Graph products of spheres, associative graded algebras and Hilbert series

2009-01-28

arxiv.org/abs/0901.4493v3

Mathematics

Algebraic Topology

19 pages, v3: elaborated on connections to related work, added more citations, to appear in Mathematische Zeitschrift

Scientific paper

Given a finite, simple, vertex-weighted graph, we construct a graded associative (non-commutative) algebra, whose generators correspond to vertices and whose ideal of relations has generators that are graded commutators corresponding to edges. We show that the Hilbert series of this algebra is the inverse of the clique polynomial of the graph. Using this result it easy to recognize if the ideal is inert, from which strong results on the algebra follow. Non-commutative Grobner bases play an important role in our proof. There is an interesting application to toric topology. This algebra arises naturally from a partial product of spheres, which is a special case of a generalized moment-angle complex. We apply our result to the loop-space homology of this space.

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