arXiv:2610.37724v1 Announce Type: new Abstract: We study the equivariant geometric quantisation of a non-compact hypertoric variety of complex dimension $2n$ using symplectic cutting. When the defining arrangement is cooriented so that its base region is non-empty and bounded, fibre rotation has proper moment map and produces compact K\"ahler orbifold cuts carrying the residual torus action. We introduce the moment polyptych of such a cut, a polytopal complex assembled from truncated arrangement regions, and show that its vertices and local lattice data determine the fixed points, tangent weights, and finite orbifold groups required for equivariant orbifold Riemann-Roch localisation. Even for a smooth hypertoric manifold, a reducible core forces every cut in the outer cut chamber to have non-trivial cyclic isotropy, while the cuts are smooth if and only if the manifold is the cotangent bundle of its distinguished compact toric subvariety, which is then a product of projective spaces. For a positive regular integral level $d$ in the outer cut chamber, algebraic cutting identifies the cut's quantisation with a finite filtration piece of the circle-graded quantisation of the original hypertoric variety, whose successive quotients recover the individual circle-weight spaces. We prove that the higher cohomology of the pre-quantum line orbibundle vanishes at every such level, so that the localised index is the character of the actual space of sections. Finally, a residual weight $x$ occurs at level $d$ if and only if $\mathcal{S}(x) \leq d$, where $\mathcal{S}$ is the arrangement slack function, with multiplicity $\binom{d - \mathcal{S}(x) + n}{n}$. Thus, each finite stage admits a weighted lattice-point description whose multiplicity function is supported on the lattice points in the support of the level-$d$ moment polyptych.
Continue to arXiv Mathematics →You are being forwarded in 6s — stay on this page