M. Belkhelfa, A. C. Salah: Surfaces in the nearly Sasakian $5$-sphere, p. 317-330


We investigate surfaces in the nearly Sasakian $5$-sphere for which the structure vector field $\xi$ is normal to the surface and which are anti-invariant with respect to the nearly Sasakian structure. We show that such surfaces are always minimal. We moreover obtain a correspondence between such surfaces and minimal Lagrangian surfaces in the complex projective space. We also show the same results for surfaces in the nearly cosymplectic $5$-sphere.

Key Words: differential geometry, nearly Sasakian manifold, nearly cosymplectic manifolds, sphere, hypersurface, surface, minimal surface.

2010 Mathematics Subject Classification: Primary 53A10
Secondary 53A40, 53C15, 53D15, 14Q10, 49Q05

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