The Soliton-Ricci Flow with variable volume forms

• Autorzy: Nefton Pali
• Języki publikacji: EN

Abstrakty

EN

We introduce a flow of Riemannian metrics and positive volume forms over compact oriented manifolds whose formal limit is a shrinking Ricci soliton. The case of a fixed volume form has been considered in our previouswork.We still call this new flow, the Soliton-Ricci flow. It corresponds to a forward Ricci type flow up to a gauge transformation. This gauge is generated by the gradient of the density of the volumes. The new Soliton-Ricci flow exist for all times. It represents the gradient flow of Perelman’s W functional with respect to a pseudo-Riemannian structure over the space of metrics and normalized positive volume forms. We obtain an expression of the Hessian of the W functional with respect to such structure. Our expression shows the elliptic nature of this operator in the orthogonal directions to the orbits obtained by the action of the group of diffeomorphism. In the case that initial data is Kähler, the Soliton-Ricci flow over a Fano manifold preserves the Kähler condition and the symplectic form. Over a Fano manifold, the space of tamed complex structures embeds naturally, via the Chern-Ricci map, into the space of metrics and normalized positive volume forms. Over such space the pseudo-Riemannian structure restricts to a Riemannian one. We perform a study of the sign of the restriction of the Hessian of the W functional over such space. This allows us to obtain a finite dimensional reduction of the stability problem for Kähler-Ricci solitons. This reduction represents the solution of this well known problem. A less precise and less geometric version of this result has been obtained recently by the author in [28].

Słowa kluczowe

EN

Bakry-Emery-Ricci tensor; Chern-Ricci form; Shrinking Ricci solitons; Kähler-Ricci solitons; Perelman’sentropy functional; Variational stability of Perelman’s entropy functional

• Wydawca: De Gruyter Open
• Czasopismo: Complex Manifolds
• Rocznik: 2016
• Tom: 3
• Numer: 1

Daty

otrzymano

2016-02-08

zaakceptowano

2016-02-25

online

2016-03-17

Twórcy

autor

Nefton Pali

• Université Paris Sud, Département de Mathématiques, Bâtiment 425 F91405 Orsay, France

Identyfikatory

DOI

10.1515/coma-2016-0003