I have been watching some videos related to how space-time is bent because of the mass (just "visually", not mathematically), and then I watched some videos about black holes.
My own conclusions (with some self-made pictures) about those videos are:
- In the place where there is mass, there is no space. Space wraps mass (that's why space is bent). This is what represents the picture below. Lines are spacetime lines, which are bent because of the mass particle. "d" is like "the separation between spacetime lines" so I can draw it. Let's say that if I shoot light beams starting from a line, it will follow the line (so, follow the curvature).
- (Now I open quotes because maybe this is stupid) "As space is bent, the force of space for recovering its initial form ("linear") is the gravity" (end of quotes). Looking at the picture above, we can imagine that those (spacetime) lines are making a force towards the mass, to recover the space the mass was ocupying.
- If an object has finite density, it means that there is some space in between particles with mass, so space does not "completly wrap the object". As less dense, more space in between the object, so less gravity (picture below). As more dense, less space in between the object, so more gravity. However, if the density of the object is infinite, there is no space in between particles with mass, so space wraps completly the object (pictuve above).
Assuming that what I said is right, from the center of the object with mass to the outside, we have mass, then space.
Following the shape of spacetime produced by a black whole:
- Why a black-hole has that shape?
- Where is the mass located?
- What is the singularity? I mean, I have read what it is, but I do not understand it.
- If not even light can scape from it, it means that the space is bent so that at the end everything crashes with the mass of the black hole, or it means that spacetime is infinitely bent that light travels forever in an infinite space.
- Why a black hole is black if the spacetime wraps the black hole? So light goes around it, but not inside it right?
I am a little confused, and maybe all what I said is wrong, but I needed to ask. If you could post some references or videos I would be thankful.