Ricci-flat Seeds, Trombone Rescaling and Magnetizing Kerr Black Holes

Abstract

We present a new family of Ricci-flat rotating metrics, which we refer to as Solution II, obtained by demagnetizing the genuine Kerr-Bertotti-Robinson (G-KBR) black hole. Together with Solution I, which was previously obtained by demagnetizing the Kerr-Bertotti-Robinson (KBR) black hole, this gives two families of Ricci-flat deformations of the Kerr black hole, each labeled by $B$. We study the global structures, thermodynamics, various limits, and the local connections among these limits. We also study the remagnetizations in both Einstein-Maxwell and Kaluza-Klein theories, and find that, to yield a physically acceptable solution, the Ernst transformation should be augmented by an appropriate trombone rescaling.