Near-Zone Symmetries of Kerr Black Holes

Understand

We study the near-zone symmetries of a massless scalar field on four-dimensional black hole backgrounds.

• We provide a geometric understanding that unifies various recently discovered symmetries as part of an SO(4,2) group.
• Of these, a subset are exact symmetries of the static sector and give rise to the ladder symmetries responsible for the vanishing of Love numbers.
• In the Kerr case, we compare different near-zone approximations in the literature, and focus on the implementation that retains the symmetries of the static limit.