Spacetime Singularities

This series results from my interest in theoretical physics and the nature of spacetime cosmology. What is the geometric nature of spacetime singularities? Another term for these singularities is black holes. A theory developed by Einstein, Roger Penrose, and Stephen Hawking, among others, is the theory of cosmic censorship. This theory essentially holds that the universe expands from the Big Bang, yet there exist singularities which draw the fabric of spacetime back into itself, and back towards the precipice of the Big Bang. The reason that the theory is called cosmic “censorship” is because the nature of the universe is hidden within and beyond the event horizon of a black hole. So in essence, an observer cannot see the singularity that makes up a black hole from outside of the event horizon.

https://iopscience.iop.org/article/10.1088/1361-6382/abb958

This image describes the theory of cosmic censorship from a standpoint of an open universe where there will not be a “Big Crunch” sometime in our future. In this picture the Big Bang is on the left, and infinitely expanding spacetime is on the right. The black cones represent singularities and the black holes within which they are contained, whereas the blue cylinders represent the areas within the event horizon, but outside of the actual singularities. There is an alternative theory to this whereas spacetime is a closed space, and singularities make up the boundary of spacetime with no space in-between. This is called a closed Weyl Structure, and is shown below.

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