White Holes: Inside the Horizon Lecture by Dr. Carlo Rovelli at Florida Atlantic University

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The problem with this explanation is that there are Schwarzschild white holes associated with Schwarzschild black holes, but Kerr white holes do not exist. In the case of Kerr, the temporal symmetry is broken, the black holes of the universe are approximately Kerr. and it is a problem that we do not know how to construct their associated white holes.

[@jonathanengle1872]

It's nice to see a viewer with some more advanced background knowledge! Einstein's equations are invariant under reversal of time. So, since the Kerr solution exists, so does its time reversal, which would be a Kerr white hole. It's true that all black holes observed so far have very large spin, and so are best described by Kerr. The high spin can be explained by the conservation of angular momentum during their formation via stellar collapse. However, the black holes that might have turned into white holes making up dark matter would have been primordial black holes, which formed within the first second after the Big Bang through a process completely different from stellar collapse, and so may not have the same bias towards high spin. In any case, when physicists use Schwarzschild, it is usually for simplicity, as a first step.

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@@jonathanengle1872 Diagrams describing Kerr black holes show that time reversal cannot be applied with the same result as Schwarzschild, in Kerr's case time reversal leads to black hole solutions and connections to "other universes". It is true that we can formulate the local evolution of a set of particles in the vicinity of the event horizon of a rotating black hole and we can obtain temporally symmetric local solutions, but we cannot construct a general Kerr white hole solution (unlike Schwarzschild) There is a suggestive idea that is the following: "Kerr to Schwarzschild to white transition during thermal death= CCC"

[@P-zp4qs]

@@jonathanengle1872 Diagrams describing Kerr black holes show that time reversal cannot be applied with the same result as Schwarzschild, in Kerr's case time reversal leads to black hole solutions and connections to "other universes". It is true that we can formulate the local evolution of a set of particles in the vicinity of the event horizon of a rotating black hole and we can obtain temporally symmetric local solutions, but we cannot construct a general Kerr white hole solution (unlike Schwarzschild) There is a suggestive idea that is the following: "Kerr to Schwarzschild to white transition during thermal death= CCC"

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@@jonathanengle1872 Kerr to Schwarzschild to white transition during the thermal death = CCC

[@KaliFissure]

Neutron decay cosmology The path of least action, physical process solution to black hole paradoxes, dark energy, dark matter and critical density maintenance Gravity gathers mass to event horizons All matter is made neutrons at event horizons because of electron capture Neutrons drop their kinetic energy off as mass for the event horizon The Neutron takes an EinsteinRosen bridge from highest energy pressure conditions to lowest energy density points of space where the quantum basement is lowest and easiest to penetrate Neutrons out in deep voids Decay into amorphous monatomic hydrogen, proton electron soup, Dark matter. The decay from neutron 0.6fm³ to 1m³ of amorphous hydrogen gas is a volume increase of around 10⁴⁵ Expansion. Dark energy. In time this amorphous hydrogen stabilizes and coalesces and follows usual evolution pathway from gas to filament to proto star to star until in the far distant future it is again about to contact an event horizon. The closure is from maxima to minima. Voids are expanding "heat cells" and we are the interstitial cooling region between. Neutron decay cosmology

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