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“ENTROPY has played a central role in discussions of the evolution of black holes since before the discovery of Hawking radiation.” We took a very big dive into this topic. https://lnkd.in/dUKnus8 View in LinkedIn

DIMINUTIVE COUSIN. ‘The physical lifetime of the white hole…(is) much shorter than the lifetime…of a large black hole.” https://lnkd.in/dUKnus8 View in LinkedIn

QED. “The evolution of the white hole in Paper I is very simple. Its mass increases steadily as a function of retarded time due to negative energy flowing out across the white hole horizon, in a time-reverse of the evolution of the black hole. The white hole disappears when the rebounding matter shell emerges, leaving nothing behind. There is no significant flow of energy along the white hole hole horizon.” https://lnkd.in/dUKnus8 View in LinkedIn

INCREASED VOLUME, DECREASED DENSITY. “Both are artifacts of viewing the geodesics from an accelerating frame rather than a local inertial frame. The same thing happens in a uniformly accelerating frame near the past horizon of a Rindler wedge in Minkowski spacetime.” https://lnkd.in/dUKnus8 View in LinkedIn

A CLUE. “The entanglement entropy of the black hole is not at all constrained by the Bekenstein-Hawking entropy at late stages of black hole evaporation.” https://lnkd.in/dUKnus8 View in LinkedIn

NEW PARADIGM NEEDED. “In any BH to WH scenario of the type considered in this paper and Paper I the central dogma is clearly false.” (BH = black hole; WH = white hole). https://lnkd.in/dUKnus8 View in LinkedIn

WORMHOLES. “Later in the evaporation process the Hawking partners must correspond to different degrees of freedom than the earlier Hawking partners, and given the finite Hilbert space the Hawking modes with which they are entangled must then be entangled with early Hawking modes, leading to a pure external state when the black hole disappears. This is justified by a very complicated quantum path integral involving "replica wormholes".” https://lnkd.in/dUKnus8 View in LinkedIn

AN EXCEPTION? “All of these alternatives contradict semi-classical expectations for large black holes. Why should an black hole horizon behave differently than an ordinary null hypersurface in Minkowski spacetime?” https://lnkd.in/dUKnus8 View in LinkedIn

INFORMATION. “Could complete quantum information be stored on the black hole horizon, at least for external observers? Could a black hole horizon never form, instead becoming a fuzzball or gravastar that has no event horizon and no trapped surfaces? Does entanglement between late Hawking modes and early Hawking modes apparently required to restore unitarity imply a singular "firewall" at the horizon?” https://lnkd.in/dUKnus8 View in LinkedIn