4 ms·
The Lense-Thirring effect is absolutely a thing, and we have direct evidence for it. To be clearer (I totally wasn't clear enough on this tbf), there's nothing
by pwatsonwailes 2y ago
The Lense-Thirring effect is absolutely a thing, and we have direct evidence for it. To be clearer (I totally wasn't clear enough on this tbf), there's nothing we know of which can do it at the required scale to allow for time travel.
What we're talking about here are closed timelike curves. There's models which suggest they could exist inside a singularity, but they're not going to outside without something which seriously breaks other areas of physics (Tipler cylinders etc).
- ganzuul 2y ago> There's models which suggest they could exist inside a singularity, but they're not going to outside without something which seriously breaks other areas of physics (Tipler cylinders etc). A singularity is a dimensionless point. It has no inside. Did you mean a black hole? If so, the Kurtzgesagt cartoon explains this. The second part of you sentence seems to have a broken sentence structure. Can't make sense of it.
- tempestn 2y agoTo clarify the rest of the sentence for you: ...but [closed time-like curves are] not going to [exist] outside [of a singularity] without something which seriously breaks other areas of physics (Tipler cylinders etc. [are examples of such theoretical instances which would break other areas of physics]).