Deconstructing Frame-Dragging

The vorticity of world-lines observers associated with the rotation a massive body was reported by Lense and Thirring more than century ago. In their example, frame-dragging effect induced is directly (explicitly) related to source. However, in many other cases, it not so, origin remains obscure difficult identify. Accordingly, order unravel this issue, looking for ultimate frame-dragging, we analyze manuscript very different scenarios where present. Specifically, consider general vacuum stationary spacetimes, electro-vacuum radiating Bondi–Sachs spacetimes. We identify physical quantities present all these which determine may legitimately be considered as responsible frame-dragging. Doing provide comprehensive, picture Some observational consequences our results are discussed.