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A TRUE BEAST. “A feature of a white hole apparent horizon is exponentially increasing blueshifts due to its negative surface gravity, but this is not a true instability, at least classically, since the exponentially increasing energy density is precisely compensated by decreasing volume from the convergence of geodesics toward the apparent horizon.” https://lnkd.in/dUKnus8 View in LinkedIn

CONSEQUENCES. “Almost all of the negative energy associated with Hawking "partners" must then remain inside the white hole, which requires that it propagate along ingoing radial null geodesics. These increase in radius inside the white hole, and converge on the white hole apparent horizon unless they intersect the matter shell first.” https://lnkd.in/dUKnus8 View in LinkedIn

HYPOTHESIS. “An alternative scenario for the evolution of the white hole is that the outflow of negative energy across the horizon lasts only for a limited retarded time, too short for the Ford-Roman bound to be violated, after which mass of the white hole becomes constant at a larger, but still Planck-scale, value until the matter shell emerges.” https://lnkd.in/dUKnus8 View in LinkedIn

QUESTION. “Does the initial outflow of negative energy from the white hole continue for the entire lifetime of the white hole, increasing the mass of the white hole up to the original mass of the black hole when the bouncing shell of matter that formed the black hole emerges and the white hole disappears?” https://lnkd.in/dUKnus8 View in LinkedIn

GEOMETRIC CONTORTIONS. “It is not surprising that energy flow does not follow such a geodesic through the transition from the black hole to the white hole, where the geometry is changing rapidly from collapse to expansion.” https://lnkd.in/dUKnus8 View in LinkedIn

“PHYSICS is full of opposites. For every action, there’s a reaction; every positive charge has a negative; every magnetic north pole has a south pole. Matter’s opposite number is antimatter. And for black holes, meet white holes. Black holes are notorious objects that suck in everything around them. Famously, not even light can escape their awesome gravity. White holes, in contrast, blow out a constant stream of matter and light – so much so that nothing can enter them.” https://lnkd.in/djSRsBX View in LinkedIn

Two pigeon embryo siblings met a harsh ending on the hot summer pavement after falling from their nest. View in LinkedIn

DESPISING HYPOTHESES. “Hitherto I have not been able to discover the cause of those properties of gravity from phenomena, and I frame no hypotheses, for whatever is not deduced from the phenomena is to be called an hypothesis; and hypotheses, whether metaphysical or physical, whether of occult qualities or mechanical, have no place in experimental philosophy. In this philosophy particular propositions are inferred from the phenomena, and afterwards rendered general by induction.” https://lnkd.in/dD8RdgD View in LinkedIn

THE INFORMATION PROBLEM. “For a sub-system of a larger quantum system, its thermodynamic entropy is usually identified with its number of quantum degrees of freedom, i.e., the logarithm of the number of its quantum states, and corresponds to its maximum possible von Neumann entropy as part of a larger system. The assumption, called the "central dogma" that this is true for black holes is what leads to the black hole information problem.” https://lnkd.in/dUKnus8 View in LinkedIn

ENTROPY LAW. “The discovery of Hawking radiation showed that a black hole radiates like a black body and has a thermodynamic (Bekenstein-Hawking) entropy proportional to the area of the black hole horizon.” https://lnkd.in/dUKnus8 View in LinkedIn