Toric nef-value fibration conjecture beyond the smooth Gorenstein case

Let (X,L)(X,\mathcal L) be an nn-dimensional toric polarized variety, not necessarily smooth or Gorenstein, and let μ(L)\mu(\mathcal L) and τ(L)\tau(\mathcal L) denote the corresponding effective log threshold and nef value. Toric nef-value fibration conjecture. If

μ(L)>n+12,\mu(\mathcal L)>\frac{n+1}{2},

then

μ(L)=τ(L).\mu(\mathcal L)=\tau(\mathcal L).

The conjecture extends the smooth-variety threshold criterion to arbitrary toric polarized varieties; in the non-Gorenstein case the source defines these invariants through the associated polytope. No resolution is given in the supplied text.

Sources & referencesView supporting material

Primary source

Sandra Di Rocco, “Linear Toric Fibrations”, arXiv:1311.1625 (2013).

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