Long-time convergence conjecture for generalized Kähler-Ricci flow on Fano varieties

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Suppose (g,I,J)(g, I, J) is a symplectic type generalized Kähler structure on a Fano manifold (M,J)(M, J), with F∈2πc1(M,J)F \in 2\pi c_1(M, J). Let (gt,It,J)(g_t,I_t,J) be the solution of the normalized generalized Kähler-Ricci flow with this initial data. Generalized Kähler-Ricci flow convergence conjecture. The solution exists for all t∈[0,∞)t\in[0,\infty). If (M,J)(M,J) admits a Kähler-Einstein metric, then the solution converges in the C∞(M)C^{\infty}(M) topology to a Kähler-Einstein metric. If (M,J)(M,J) admits a Kähler-Ricci soliton with soliton vector field KK, and (g,I,J)(g,I,J) is invariant under the torus action generated by KK, then there is a smooth family of complex automorphisms τt\tau_t of (M,J)(M,J) such that the pullback of gtg_t by τt\tau_t converges in the C∞(M)C^{\infty}(M) topology to a Kähler-Ricci soliton metric in c1(M,J)c_1(M,J) with soliton vector field KK. If (M,J)(M,J) is a toric Fano variety and (g,I,J)(g,I,J) is invariant under the maximal torus T\mathbb T, then the reduced equation has a global solution ϕt(y)\phi_t(y) on [0,∞)×Rm[0,\infty)\times\mathbb R^m, and there are points yt∈Rny_t\in\mathbb R^n and real constants ctc_t such that

ϕ~t(y):=ϕt(y+yt)+ct\widetilde\phi_t(y):=\phi_t(y+y_t)+c_t

converges in C∞([0,∞)×Rm)C^{\infty}([0,\infty)\times\mathbb R^m) to a smooth convex function ϕ~∞(y)\widetilde\phi_{\infty}(y) on Rm\mathbb R^m defining a T\mathbb T-invariant Kähler-Ricci soliton on MM. This conjecture is a generalized Kähler analogue of the corresponding long-time existence and convergence results for normalized Kähler-Ricci flow on Fano manifolds. The nonsingular convergence theorem and the toric scalar convergence results provide partial evidence, but the full assertion remains open.

References

Primary source

Vestislav Apostolov, Jeffrey Streets and Yury Ustinovskiy, “Generalized Kähler-Ricci flow on toric Fano varieties”, arXiv:2104.03268 (2022).

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