Mechanics

Computer science

Theoretical physics

Quantum mechanics

Rotating black hole

Engineering

Classical mechanics

Rotational symmetry

Routing (electronic design automation)

Black hole (networking)

Link-state routing protocol

Sense (electronics)

Angular momentum

Routing protocol

Electrical engineering

Physics

Degrees of freedom (physics and chemistry)

Computer network

Physical Review Letters

A theorem is described which establishes the claim that in a certain canonical sense the Kerr metrics represent "the" (rather than merely "some possible") exterior fields of black holes with the corresponding mass and angular-momentum values.

Axisymmetric Black Hole Has Only Two Degrees of Freedom