The conjecture on tangent cones and metric density of log Kähler–Einstein limits

Let (W,(1β)Δ,g)(W,(1-\beta)\Delta,g) be a Gromov–Hausdorff limit of log Fano pairs admitting a Kähler–Einstein metric. For a point pp of this metric space, let the metric tangent cone at pp and its metric density be denoted by the corresponding tangent-cone notation and Θp\Theta_p, and let vol^W,p\widehat{\operatorname{vol}}_{W,p} denote the normalised volume of the singularity.

Tangent-cone conjecture. The following properties hold:

  1. For every point p(W,(1β)Δ,g)p\in (W,(1-\beta)\Delta,g), the metric tangent cone at pp is unique.
  2. The metric density satisfies
Θp=vol^W,p.\Theta_p=\widehat{\operatorname{vol}}_{W,p}.
  1. The metric tangent cone admits an algebraic interpretation via the two-step construction.

These are proposed as log-setting analogues of results known in the absolute case. The source says that the picture is incomplete, in particular because the corresponding tangent-cone results for log pairs were not yet proved.

Sources & referencesView supporting material

Primary source

Patricio Gallardo, Jesus Martinez-Garcia and Cristiano Spotti, “Applications of the moduli continuity method to log K-stable pairs”, arXiv:1811.00088 (2020).

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