Generalized Matsushima's theorem and K\"ahler-Einstein cone metrics

In this paper, we prove Matsushima's theorem for K\"ahler-Einstein metrics on a Fano manifold with cone singularities along a smooth divisor that is not necessarily proportional to the anti-canonical class. We then give an alternative proof of uniqueness of K\"ahler-Einstein cone metrics by the continuity method. Moreover, our method provides an existence theorem of K\"ahler-Einstein cone metrics with respect to conic Ding functional.