Publicacions Matemàtiques

Low energy canonical immersions into hyperbolic manifolds and standard spheres

Abstract

We consider critical points of the global $L^2$-norm of the second fundamental form, and of the mean curvature vector of isometric immersions of compact Riemannian manifolds into a fixed background Riemannian manifold, as functionals over the space of deformations of the immersion. We prove new gap theorems for these functionals into hyperbolic manifolds, and show that the celebrated gap theorem for minimal immersions into the standard sphere can be cast as a theorem about their critical points having constant mean curvature function, and whose second fundamental form is suitably small in relation to it. In this case, the various minimal submanifolds that occur at the pointwise upper bound on the norm of the second fundamental form are realized by manifolds of nonnegative Ricci curvature, and of these, the Einstein ones are distinguished from the others by being those that are immersed on the sphere as critical points of the first of the functionals mentioned.

Article information

Source
Publ. Mat., Volume 61, Number 1 (2017), 135-151.

Dates
Revised: 25 September 2015
First available in Project Euclid: 22 December 2016

https://projecteuclid.org/euclid.pm/1482375627

Digital Object Identifier
doi:10.5565/PUBLMAT_61117_05

Mathematical Reviews number (MathSciNet)
MR3590117

Zentralblatt MATH identifier
1360.53062

Citation

del Rio, Heberto; Santos, Walcy; Simanca, Santiago R. Low energy canonical immersions into hyperbolic manifolds and standard spheres. Publ. Mat. 61 (2017), no. 1, 135--151. doi:10.5565/PUBLMAT_61117_05. https://projecteuclid.org/euclid.pm/1482375627