Finite degeneration conjecture to a weak Kähler–Ricci soliton

Let MM be a Fano manifold and consider weak conical Kähler–Ricci solitons on varying pairs (W,Δ)(W,\Delta), satisfying

Ric(ωt)+LXtωt=tωt+1tm[Δ].\operatorname{Ric}(\omega_t)+L_{X_t}\omega_t=t\omega_t+\frac{1-t}{m}[\Delta].

A test-configuration for (M,KM1)(M,K_M^{-1}) is a C\mathbf{C}^*-equivariant degeneration whose central fiber is a polarized variety. Finite degeneration conjecture. One can solve the displayed equation up to t=1t=1 by passing through finitely many singular times and changing the pair (W,Δ)(W,\Delta) at each time. At t=1t=1 one obtains a Q\mathbf{Q}-Fano variety WkW_k admitting a weak Kähler–Ricci soliton, and there is a test-configuration for (M,KM1)(M,K_M^{-1}) with central fiber WkW_k. This conjecture proposes a finite continuation and degeneration process when the original Fano manifold admits no Kähler–Einstein metric. The supplied status evidence says that the cited toric-surface case of the earlier Yau–Tian–Donaldson conjecture is established, but does not resolve this conjecture.

Sources & referencesView supporting material

Primary source

Gábor Székelyhidi, “Extremal Kähler metrics”, arXiv:1405.4836 (2014).

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