<p>Hypersurfaces are studied and classified under multiple additional assumptions in any Riemannian homogeneous space <InlineEquation ID="IEq4"> <EquationSource Format="TEX">\(({\mathbb {C}P}^3, g_a)\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mo stretchy="false">(</mo> <msup> <mrow> <mi mathvariant="double-struck">C</mi> <mi>P</mi> </mrow> <mn>3</mn> </msup> <mo>,</mo> <msub> <mi>g</mi> <mi>a</mi> </msub> <mo stretchy="false">)</mo> </mrow> </math></EquationSource> </InlineEquation>, including nearly Kähler <InlineEquation ID="IEq5"> <EquationSource Format="TEX">\({\mathbb {C}P}^3\)</EquationSource> <EquationSource Format="MATHML"><math> <msup> <mrow> <mi mathvariant="double-struck">C</mi> <mi>P</mi> </mrow> <mn>3</mn> </msup> </math></EquationSource> </InlineEquation>. Notably, all extrinsically homogeneous hypersurfaces are classified in all these spaces, with an explicit family of examples. Moreover, for nearly Kähler <InlineEquation ID="IEq6"> <EquationSource Format="TEX">\({\mathbb {C}P}^3\)</EquationSource> <EquationSource Format="MATHML"><math> <msup> <mrow> <mi mathvariant="double-struck">C</mi> <mi>P</mi> </mrow> <mn>3</mn> </msup> </math></EquationSource> </InlineEquation>, all Hopf hypersurfaces are classified. Finally, Codazzi-like hypersurfaces (and in particular parallel and totally geodesic hypersurfaces), totally umbilical hypersurfaces and constant sectional curvature hypersurfaces are proven to not exist in any homogeneous <InlineEquation ID="IEq7"> <EquationSource Format="TEX">\({\mathbb {C}P}^3\)</EquationSource> <EquationSource Format="MATHML"><math> <msup> <mrow> <mi mathvariant="double-struck">C</mi> <mi>P</mi> </mrow> <mn>3</mn> </msup> </math></EquationSource> </InlineEquation>.</p>

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Hypersurfaces of any homogeneous \({\mathbb {C}P}^3\)

  • Michaël Liefsoens

摘要

Hypersurfaces are studied and classified under multiple additional assumptions in any Riemannian homogeneous space \(({\mathbb {C}P}^3, g_a)\) ( C P 3 , g a ) , including nearly Kähler \({\mathbb {C}P}^3\) C P 3 . Notably, all extrinsically homogeneous hypersurfaces are classified in all these spaces, with an explicit family of examples. Moreover, for nearly Kähler \({\mathbb {C}P}^3\) C P 3 , all Hopf hypersurfaces are classified. Finally, Codazzi-like hypersurfaces (and in particular parallel and totally geodesic hypersurfaces), totally umbilical hypersurfaces and constant sectional curvature hypersurfaces are proven to not exist in any homogeneous \({\mathbb {C}P}^3\) C P 3 .