Typing my question directly so people know what I am asking, afterwards providing background and context.
Q: What does it mean when space is falling, faster than light? (I am specifically wondering about just that "space falling" which is what is confusing me the most).
I mean it does this after it falls inside the horizon of a black hole. (A Schwarzschild black hole to be specific, so a "static", no electric charge & no spin)
this is stated in both the documentary, and in the book(both provided below).
Citing the book
space is falling into the black hole. Outside the horizon, space is falling less than the speed of light; at the horizon space is falling at the speed of light; and inside the horizon, space is falling faster than light, carrying everything with it. This is why light cannot escape from a black hole: inside the horizon, space falls inward faster than light, carrying light inward even if that light is pointed radially outward.
- General Relativity, Black Holes, and Cosmology by Andrew J. S. Hamilton 4 December 2021 Available here at chapter 7. "Schwarzschild Black Hole" section '7.6 Horizon' - page 137
And, I include a screenshot of this Wikipedia link about the Event horizon of a black hole, which also illustrates this:
Background and what I have tried
And I am reading books(like Sean Carroll's "spacetime and geometry" intro to general relativity, and Taylor/Wheeler's book as well, and many others). And so I am not completely "new" to Physics but, not at all an expert.
What I have tried
Before asking this question I thoroughly tried to find my question in various, numerous sites(including this one), and books. But didn't find anything that would explain the stating that "space" would fall. (excluding the one I typed above)
Before this question was asked
I read other questions and answers on this site, and specifically this question really inspired me how I should write my question, as well as of course first of all I read the following:
I want to be very clear that I "Keep an open mind", and I try to be on-topic and specific.
Which is why I typed the question directly above, and, to be sure it doesn't become a vague or more discussion kind of question, I try to keep things short. Since this is also, my first question.
Citing the Documentary
This documentary about black holes - at timestamp
33:13 Hamilton, Andrew J S says the following:
space is falling faster than light
My question is about just that, and I do know this is from YouTube, which is why I provided the link to the book and checked the topic discussed about in here.
Resources I have tried
- why didn't that article help?
- the question is about "spacetime", whereas my question is about "space" itself.