Perelman’s entropies for manifolds with conical singularities

Kröncke, Klaus; Vertman, Boris

doi:10.1090/tran/8295

Perelman’s entropies for manifolds with conical singularities
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Trans. Amer. Math. Soc. 374 (2021), 2873-2908 Request permission

Abstract:

In this paper we discuss Perelman’s $\lambda$-functional, Perelman’s Ricci shrinker entropy as well as the Ricci expander entropy on a class of manifolds with isolated conical singularities. On such manifolds, a singular Ricci de Turck flow preserving the isolated conical singularities exists by our previous work. We prove that the entropies are monotone along the singular Ricci de Turck flow. We employ these entropies to show that in the singular setting, Ricci solitons are gradient and that steady or expanding Ricci solitons are Einstein.

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