Category: Uncategorized

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

CONTRADICTIONS. “The existence of a black hole event horizon depends on energy conditions that, while reasonable in a classical context, are known to be violated in quantum field theory.” https://lnkd.in/dUKnus8 View in LinkedIn

GOAL. “The main purpose of this paper is to give a more general discussion of how in the quasi-classical framework the black hole can transition to the white hole.” https://lnkd.in/dUKnus8 View in LinkedIn

GUESTS ARRIVING AT A PARTY. “If the late Hawking radiation is entangled with early Hawking radiation rather than with Hawking "partners" inside the horizon, purifying the state for external observers, there are predictions of a "firewall" along the event horizon.” https://lnkd.in/dUKnus8 View in LinkedIn

NEGATIVE ENERGY. “However, prolonged outflow of negative energy to large radii is problematic, since at large radii the energy density violates minimum average energy density theorems proved for quantum field theory in Minkowski spacetime.” https://lnkd.in/dUKnus8 View in LinkedIn

INFORMATION PARADOX. “Quantum information falling across the event horizon is swallowed up by a singularity or disappears into a "baby universe", unless it can propagate acausally. Could it somehow all remain on or outside the event horizon even as the quantum fields propagate into the black hole?” https://lnkd.in/dUKnus8 View in LinkedIn

BUT OF COURSE. “The metric is smoothly continued into the white hole as a function of a coordinate z related to the circumferential radius by r2 = a2 + z2 , and the effective stress-energy tensor has an outflow of negative energy across the white hole horizon to future null infinity.” https://lnkd.in/dUKnus8 View in LinkedIn