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BACK HOLE —> WHITE HOLE. “If such a transition, suggested by Loop Quantum Gravity, can be firmly established, the conventional holographic interpretation of the fine-grained entropy of a black hole must be abandoned. It would also be a counter-example to the generalized second law and quantum singularity theorems.” https://lnkd.in/dUKnus8 View in LinkedIn

GEOMETRIC PARAMETERS. “I consider the general properties of such a transition and the end of the black hole following from the assumption of a smooth geometry.” https://lnkd.in/dUKnus8 View in LinkedIn

TOUGH SENTENCE, TOUGH CONCEPT. “The quantum evolution of the geometry outside a collapsing shell is described by a smoothly evolving spherically symmetric effective metric, with a transition from trapped surfaces in the black hole to anti-trapped surfaces in the white hole at a spacelike hypersurface on which the circumferential radius has a minimum Planck-scale value.” https://lnkd.in/dUKnus8 View in LinkedIn

ALTERNATIVE SOLUTIONS. “On the other hand, arguments have been made based on Loop Quantum Gravity (LQG) that singularities in the black hole interior can be resolved, such that the black hole transitions into a white hole.” https://lnkd.in/dUKnus8 View in LinkedIn

CLASSIC + QUANTUM BLACK HOLES. “This has led some to propose a drastic quantum modification of the spacetime to prevent formation of a black hole horizon (fuzzballs, gravastars, etc.), even though quantum corrections naively should scale as h/ M 2 (units G = c = 1 ), which is incredibly small in the vicinity of the horizon of a large black hole.” https://lnkd.in/dUKnus8 View in LinkedIn

Lime tree seeds on their little helicopters: the truimph of hope over experience, for the majority of these time capsules to another world perish. View in LinkedIn

VERY ADVANCED THOUGHT. “This book is about the geometry of linguistic meaning. If spacial concepts play a crucial role in linguistic meaning, then geometry ought to be a useful way to describe these meanings.” (Emeritus Professor Paul Chilton, Lancaster University UK). https://lnkd.in/d7GVbDg View in LinkedIn

ROLE OF THE OBSERVER. “The geometry and effective stress-energy tensor in the neighborhood of the outer edge of the transition hypersurface, where the black hole horizon ends and the white hole horizon begins as seen by external observers, is analyzed in Part III.” https://lnkd.in/dUKnus8 View in LinkedIn

CONTRADICTIONS WHERE BOTH ARE TRUE. “Despite this, there is a tacit assumption in most of the literature that an event horizon with an interior singularity is a general property of quantum as well as classical black holes.” https://lnkd.in/dUKnus8 View in LinkedIn

NEW PERSPECTIVE, “While the transition to the white hole is still assumed to be on a spacelike hypersurface at a minimum circumferential radius r = a separating the trapped surfaces in the interior of the black hole from the anti-trapped 2-surfaces in the interior of the white hole, I consider alternative scenarios for evolution of the white hole, in which the white hole only emits negative energy for a limited Planck-scale range of retarded time.” https://lnkd.in/dUKnus8 View in LinkedIn