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+--- Thread: Article Black holes might be defects in spacetime (/thread-14107.html)
Black holes might be defects in spacetime - C C - May 15, 2023
https://www.universetoday.com/161291/black-holes-might-be-defects-in-spacetime/
EXCERPTS: A team of theoretical physicists have discovered a strange structure in space-time that to an outside observer would look exactly like a black hole, but upon closer inspection would be anything but: they would be defects in the very fabric of the universe.
[...] a new class of object, something that they call a topological soliton. In their analysis they found that these topological solitons are stable defects in space-time itself. They require no matter or other forces to exist – they are as natural to the fabric of space-time as cracks in ice.
[....] It’s only once you got close would you realize that you are not looking at a black hole. One of the key features of a black hole is its event horizon, an imaginary surface that if you were to cross it you would find yourself unable to escape. Topological solitons, since they are not singularities, do not feature event horizons. So you could in principle go up to a soliton and hold it in your hand, assuming you survived the encounter.,, (MORE - missing details)
PAPER: https://journals.aps.org/prd/abstract/10.1103/PhysRevD.107.084042
RE: Black holes might be defects in spacetime - C C - May 17, 2023
We can’t avoid a singularity inside every black hole
https://bigthink.com/starts-with-a-bang/singularity-inside-black-hole/
KEY POINTS: According to General Relativity, inside of a black hole, there must be a region of infinite density at its center: commonly referred to as a singularity. But singularities are pathological in mathematical terms: it's as though you divided by zero, and everything becomes ill-defined. Nevertheless, there are some very compelling reasons, fundamental to physics itself, to think that a singularity is unavoidable inside these monsters. There may be no way out.