= 27d567bc2d48d9f40e9ccc20ea370b15)
Alejandro1 comments on Causal Reference - Less Wrong
You are viewing a comment permalink. View the original post to see all comments and the full post content.
= 783df68a0f980790206b9ea87794c5b6)
Loading…= b715d02e85f7b3b4ae65ca3d3e450868)
Subscribe to RSS Feed
Powered by Reddit
= f037147d6e6c911a85753b9abdedda8d)
You are viewing a comment permalink. View the original post to see all comments and the full post content.
Comments (242)
Wrong. There could be tons of different things going on inside, absolutely indistinguishable from outside, which only sees mass, electric charge and angular momentum. There is no causal connection from inside to outside whatsoever, barring FTL communication.
Wrong again. There is no singularity of any kind behind the cosmological horizon (which is not a closed surface to begin with, so it cannot "surround" anything). Well, there might be black holes and stuff, or there might not be, but there is certainly not a requirement of anything singular being there. Consider googling the definition of singularity in general relativity.
Nitpick: this is only true for a stationary black hole. If you throw something sufficiently big in, you would expect the shape of the horizon to change and bulge a bit, until it settles down into a stationary state for a larger black hole. You are of course correct that this does not allow anything inside to send a signal to the outside.
Right, I didn't want to go into these details, MrMind seems confused enough as it is. I'd have to explain that the horizon shape is only determined by what falls in, and eventually talk about apparent and dynamical horizons and marginally outer trapped surfaces...