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

Suppose (g,I,J)(g, I, J) is a symplectic type generalized Kähler structure on a Fano manifold (M,J)(M, J), with F2πc1(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 ytRny_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.

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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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