The Dark Mystery of a White Hole #AstronomyNow

Everything that happens past the event horizon of a black hole can only ever be the subject of speculation. Many believe that the extraordinary gravitational forces at work in and around a black hole can lead to time dilation and something called spaghettification, which is exactly what you think it is. But Italian theoretical physicis Carlo Rovelli has a whole new notion of what these black holes might be — and he thinks they might not be “black” at all. Here’s more from Centauri Dreams:

…in a remarkably brief book called, simply, White Holes (Riverhead Books, 2023) wherein [Rovelli] travels in company with Dante Alighieri, another author with experience at descents into perilous places. …Rovelli states that another scientist, Daniel Finkelstein, demonstrated that Einstein and other analysts are incorrect when they depict what occurs as one enters a black hole. From the Finkelstein paper (citation below):

“The gravitational field of a spherical point particle is then seen not to be invariant under time reversal for any admissible choice of time coordinate. The Schwarzschild surface, r=2m is not a singularity but acts as a perfect unidirectional membrane: causal influences can cross it but only in one direction.”

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