Perdomo's index conjecture for minimal hypersurfaces in spheres

Let x:Mⁿ→ⁿ⁺¹(1), n≥2, be a full minimal immersion of a closed, connected, oriented manifold. We prove that its Morse index is at least $n+3$, with equality precisely for the standard Clifford embeddings. For a non-Clifford image, the constant function and the position and normal coordinates span a space containing an $(n+4)$-dimensional subspace on which the Jacobi quadratic form is negative definite.