1110.3872 (Yoshihiro Mitsuka et al.)

No more CKY two-forms in the NHEK    [PDF]

Yoshihiro Mitsuka, George Moutsopoulos

We show that in the near-horizon limit of a Kerr-NUT-AdS black hole, the
space of conformal Killing-Yano two-forms does not enhance and remains of
dimension two. The same holds for an analogous polar limit in the case of
extremal NUT charge. We also derive the conformal Killing-Yano $p$-form
equation for any background in arbitrary dimension in the form of parallel
transport.

View original: http://arxiv.org/abs/1110.3872