We prove that some Riemannian manifolds with boundary satisfying an explicit integral pinching condition are spherical space-forms. More precisely, we show that three-dimensional Riemannian manifolds with totally geodesic boundary, positive scalar curvature and an explicit integral pinching between the -norm of the scalar curvature and the -norm of the Ricci tensor are spherical space-forms with totally geodesic boundary. Moreover, we also prove that four-dimensional Riemannian manifolds with umbilic boundary, positive Yamabe invariant and an explicit integral pinching between the total integral of the -curvature and the -norm of the Weyl curvature are spherical space-forms with totally geodesic boundary. As a consequence, we show that a certain conformally invariant operator, which plays an important role in Conformal Geometry, is non-negative and has trivial kernel if the Yamabe invariant is positive and verifies a pinching condition together with the total integral of the -curvature. As an application of the latter spectral analysis, we show the existence of conformal metrics with constant -curvature, constant -curvature, and zero mean curvature under the latter assumptions.
@article{ASNSP_2010_5_9_4_785_0, author = {Catino, Giovanni and Ndiaye, Cheikh Birahim}, title = {Integral pinching results for manifolds with boundary}, journal = {Annali della Scuola Normale Superiore di Pisa - Classe di Scienze}, pages = {785--813}, publisher = {Scuola Normale Superiore, Pisa}, volume = {Ser. 5, 9}, number = {4}, year = {2010}, mrnumber = {2789475}, zbl = {1246.53062}, language = {en}, url = {http://www.numdam.org/item/ASNSP_2010_5_9_4_785_0/} }
TY - JOUR AU - Catino, Giovanni AU - Ndiaye, Cheikh Birahim TI - Integral pinching results for manifolds with boundary JO - Annali della Scuola Normale Superiore di Pisa - Classe di Scienze PY - 2010 SP - 785 EP - 813 VL - 9 IS - 4 PB - Scuola Normale Superiore, Pisa UR - http://www.numdam.org/item/ASNSP_2010_5_9_4_785_0/ LA - en ID - ASNSP_2010_5_9_4_785_0 ER -
%0 Journal Article %A Catino, Giovanni %A Ndiaye, Cheikh Birahim %T Integral pinching results for manifolds with boundary %J Annali della Scuola Normale Superiore di Pisa - Classe di Scienze %D 2010 %P 785-813 %V 9 %N 4 %I Scuola Normale Superiore, Pisa %U http://www.numdam.org/item/ASNSP_2010_5_9_4_785_0/ %G en %F ASNSP_2010_5_9_4_785_0
Catino, Giovanni; Ndiaye, Cheikh Birahim. Integral pinching results for manifolds with boundary. Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 5, Tome 9 (2010) no. 4, pp. 785-813. http://www.numdam.org/item/ASNSP_2010_5_9_4_785_0/
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