Negative Komar Masses in Regular Stationary Spacetimes

Understand

A highly accurate multi-domain spectral method is used to study axially symmetric and stationary spacetimes containing a black hole or disc of dust surrounded by a ring of matter.

• It is shown that the matter ring can affect the properties of the central object drastically.
• In particular, by virtue of the ring's frame dragging, the so-called Komar mass of the black hole or disc can become negative.
• A continuous transition from such discs to such black holes can be found.