On the constant scalar curvature Kähler metrics, existence results

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In this paper, we generalize our apriori estimates on cscK(constant scalar curvature Kähler) metric equation to more general scalar curvature type equations (e.g., twisted cscK metric equation). As applications, under the assumption that the automorphism group is discrete, we prove the celebrated Donaldson's conjecture that the non-existence of cscK metric is equivalent to the existence of a destabilized geodesic ray where the K-energy is non-increasing. Moreover, we prove that the properness of K-energy in terms of L¹ geodesic distance d₁ in the space of Kähler potentials implies the existence of cscK metric. Finally, we prove that weak minimizers of the K-energy in (E¹, d₁) are smooth.