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tionis
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I'm referring to the black hole itself, not some object falling in it.Thanks.
jedishrfu said:As an aside. sometimes spacetime diagrams with the appropriate coordinate system can help:
https://en.wikipedia.org/wiki/Kruskal–Szekeres_coordinates
Nugatory said:looking at the diagram it is clear that the black hole is a region of spacetime that cannot be described as either a worldline or a worldtube.
tionis said:Hawking said horizons probably don't exist. If that is found to be the case, are astrophysical black holes going to be assigned a worldtube, a worldline, or neither?
A world line is a concept used in physics to describe the path of an object through space and time. It represents the past, present, and future positions of the object and can be thought of as a 4-dimensional graph.
Yes, black holes have world lines just like any other object in the universe. However, due to their extreme gravitational pull and the warping of spacetime near them, their world lines may appear differently than those of other objects.
Black holes have a significant effect on their own world lines due to their immense mass and gravitational pull. The closer an object gets to the event horizon (the point of no return), the more its world line will bend towards the singularity at the center of the black hole.
No, we cannot directly observe the world line of a black hole. However, we can infer its existence and properties through observations of the effects it has on its surroundings, such as the bending of light and the motion of other objects.
The world line of a black hole changes over time as it continues to grow and accrete matter. As more mass is added to the black hole, its gravitational pull and curvature of spacetime will increase, causing changes in its world line.