On a filtration of the second cohomology of nilpotent Lie algebras

Details On a filtration of the second cohomology of nilpotent Lie algebras On a filtration of the second cohomology of nilpotent Lie algebras

2010-07-29

arxiv.org/abs/1007.5150v2

Mathematics

Rings and Algebras

20 pages

Scientific paper

We study a known filtration of the second cohomology of a finite dimensional nilpotent Lie algebra $\mathfrak{g}$ with coefficients in a finite dimensional nilpotent $\mathfrak{g}$-module $M$, that is based upon a refinement of the correspondence between $\mathrm{H}^2(\mathfrak{g},M)$ and equivalence classes of abelian extensions of $\mathfrak{g}$ by $M$. We give a different characterization of this filtration and as a corollary, we obtain an expression for the second Betti number of $\mathfrak{g}$. Using this expression, we find bounds for the second Betti number and derive a cohomological criterium for the existence of certain central extensions of $\mathfrak{g}$.

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