Three prevalent themes in the discussion
- The singularity is a spacelike “surface in time,” not a point, and the “space‑time switch” is a coordinate artifact
- pdönis: “the space and time coordinates switch places as you cross the event horizon … the ‘switch places’ is an artifact of a particular choice of coordinates (Schschild coordinates), and does not represent anything physical.”
- metalliqaz: “it might help to think of the singularity as not a point in space but rather a future that cannot be avoided.”
-
Kranar: “past the event horizon you can use the direction in space between you and the singularity as a way to measure time … the relationship … is fixed and causal.”
-
The paper’s points are standard General Relativity, not new research, and pop‑science often oversimplifies them
- sigmoid10: “this is a critique of common popsci journalism tropes and not a fancy new research result. Anyone who has taken a graduate level class in General Relativity would have been able to tell you the same.”
- pdönis: “Unfortunately you are wrong. Everything the paper is saying … is well understood and has been for decades.”
-
ImHereToVote: “Singularities suggest incomplete theories.” (highlights the recurring pop‑sci framing of singularities as mysterious.)
-
Analogies, diagrams, and visual aids are used to build intuition, but they have limits
- Certhas: “As is nicely visualised by it's Penrose Diagram, e.g.” (link to diagram).
- altairprime: elaborate balloon‑over‑vacuum‑cleaner analogy showing the event horizon as a 2‑D surface that can hold arbitrary amounts of “sand.”
- ben_w: “Normally people think of gravity as pulling on objects. You can instead think of it as pulling on the space those objects are in.” (illustrates the shift from force‑to‑geometry intuition).