Generalized affine-paving conjecture for cohomologically pure varieties

Let VV be a projective algebraic variety over kk admitting an action of a torus TT such that the fixed points VTV^{T} and the one-dimensional orbits VT,1V^{T,1} are finite. For a total order o\mathfrak{o} on the vertices of the associated graph Γ\Gamma, let Vo(v)V^{\mathfrak{o}}(v) be the locally closed pieces obtained inductively from the attracting sets of the vertices. A generalized affine paving is a decomposition into locally closed subvarieties having the same compactly supported cohomology as an affine space An\mathbf{A}^{n}.

Generalized affine-paving conjecture. If o\mathfrak{o} is a total order such that Po(t)=PV(t)P^{\mathfrak{o}}(t)=P_V(t), then the decomposition of VV according to o\mathfrak{o} is a generalized affine paving.

The conjecture proposes a general method for constructing affine-paving-like decompositions from torus fixed-point and one-dimensional-orbit data. Its general status is open.

Sources & referencesView supporting material

Primary source

Zongbin Chen, “Truncated affine grassmannians and truncated affine Springer fibers for GL_3”, arXiv:1401.1930 (2014).

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