The new theory contradicts earlier predictions that these 'shortcuts' would instantly collapse. ⬇️
The findings contradict earlier predictions that these hypothetical shortcuts through space-time would instantly collapse.
While the rules of general relativity are fixed, the theory itself provides a lot of freedom to describe those coordinates mathematically. Physicists call these different descriptions"metrics." Think of the metric as different ways to describe g how to get to your grandma's house for Thanksgiving. That may be street directions, satellite-based latitude and longitude, or landmarks scribbled on a napkin.
And by"misbehaves," we mean that metric completely breaks down, and it can no longer distinguish between different points in space and time. But there's another metric, called the Eddington-Finkelstein metric, that does describe what happens to particles when they reach the event horizon: They pass right through and fall into the black hole, never to be seen again.
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