An inequality for contact CR-submanifolds in Sasakian space forms
The theory of \(\delta \) -invariants was initiated by Chen (Arch Math 60:568–578, 1993) in order to find new necessary conditions for a Riemannian manifold to admit a minimal isometric immersion in a Euclidean space. Chen (Int J Math 23(3):1250045, 2012) defined a CR \(\delta \) -invariant \(\delta (D)\) for anti-holomorphic submanifolds in complex space forms. Afterwards, Al-Solamy et al. (Taiwan J Math 18:199–217, 2014) established an optimal inequality for this invariant for anti-holomorphic submanifolds in complex space forms. In this article, we prove an optimal inequality for the contact CR \(\delta \) -invariant on contact CR-submanifolds in Sasakian space forms. An example for the equality case is given.
Publisher URL: https://link.springer.com/article/10.1007/s00022-018-0440-4
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