Article
Keywords:
Lorentzian geometry; Newman-Penrose; Geroch-Held-Penrose; Weyl tensor; polynomial invariants; algebraically special spacetimes; quadratic gravity
Summary:
Selected applications of the algebraic classification of tensors on Lorentzian manifolds of arbitrary dimension are discussed. We clarify some aspects of the relationship between  invariants of tensors  and their algebraic class, discuss generalization of Newman-Penrose and Geroch-Held-Penrose formalisms to  arbitrary dimension and  study an application of the algebraic classification to the case of quadratic gravity.