1,721,110 research outputs found
Codazzi tensors on Sasakian manifolds
No full textWe prove that every compact Sasakian manifold of dimension 2n+1 whose horizon- tal sectional curvatures are non-negative and such that 2n is a simple eigenvalue of the Ricci operator admits no non-trivial Codazzi tensors. The same fact is true under suitable pinching assumptions on the φ-sectional curvatures
On homogeneous -Einstein almost cosymplectic manifolds
No full textWe prove that every compact, homogeneous η-Einstein almost cosymplectic manifold is a cosymplectic manifold
Non-existence of compact homogeneous -Sasakian manifolds
No full textWe show that there exist no compact homogeneous P-Sasakian manifolds whose structure vector field is invariant under the given Lie group action
On locally homogeneous contact metric manifolds with Reeb flow invariant Jacobi operator
Full text linkWe show that a locally homogeneous, regular contact metric manifold, whose characteristic Jacobi operator is invariant under the Reeb flow, is not compact, provided it admits at least one negative -sectional curvature
Su di un caso di depressione con danno organico cerebrale: considerazioni cliniche ed etiopatogenetiche
No full text
A note on Riemannian connections with skew torsion and the de Rham splitting
Full text linkWe prove that a Riemannian manifold admitting a metric connection with totally skew-symmetric torsion and reducible holonomy is locally reducible, provided it has nonpositive sectional curvature
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