In this paper we obtain generalized Calabi-type compactness criteria for complete Riemannian manifolds that allow the presence of negative amounts of Ricci curvature. These, in turn, can be rephrased as new conditions for the positivity, for the existence of a first zero and for the nonoscillatory-oscillatory behaviour of a solution g(t) of g′′ + Kg = 0, subjected to the initial condition g(0) = 0, g′(0) = 1. A unified approach for this ODE, based on the notion of critical curve, is presented. With the aid of suitable examples, we show that our new criteria are sharp and, even for K ≥ 0, in borderline cases they improve on previous works of Calabi, Hille-Nehari and Moore.

Some generalizations of Calabi compactness theorem / B. Bianchini, L. Mari, M. Rigoli. - In: MATEMATICA CONTEMPORANEA. - ISSN 0103-9059. - 40:(2011), pp. 103-124. [10.21711/231766362011/rmc405]

Some generalizations of Calabi compactness theorem

L. Mari
Secondo
;
M. Rigoli
Ultimo
2011

Abstract

In this paper we obtain generalized Calabi-type compactness criteria for complete Riemannian manifolds that allow the presence of negative amounts of Ricci curvature. These, in turn, can be rephrased as new conditions for the positivity, for the existence of a first zero and for the nonoscillatory-oscillatory behaviour of a solution g(t) of g′′ + Kg = 0, subjected to the initial condition g(0) = 0, g′(0) = 1. A unified approach for this ODE, based on the notion of critical curve, is presented. With the aid of suitable examples, we show that our new criteria are sharp and, even for K ≥ 0, in borderline cases they improve on previous works of Calabi, Hille-Nehari and Moore.
Ricci Soliton; almost Ricci soliton; immersion; meancurvature;
Settore MAT/03 - Geometria
Settore MAT/05 - Analisi Matematica
2011
Article (author)
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/1039329
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