Black Holes: Complementarity vs Firewalls
- Subtitle: Strings 2012
- Speaker: Raphael Bousso
- Location: Ludwig-Maximilians-Universität München
- Date: 27.07.2012 @ 16:04
Ahmed Almheiri, Donald Marolf, Joseph Polchinski, James Sully
We argue that the following three statements cannot all be true: (i) Hawking radiation is in a pure state, (ii) the information carried by the radiation is emitted from the region near the horizon, with low energy effective field theory valid beyond some microscopic distance from the horizon, and (iii) the infalling observer encounters nothing unusual at the horizon. Perhaps the most conservative resolution is that the infalling observer burns up at the horizon. Alternatives would seem to require novel dynamics that nevertheless cause notable violations of semiclassical physics at macroscopic distances from the horizon. Black Hole: Complementarity vs Firewall
This lecture presents some particular thoughts that rang a bell for me in terms of what reporting was done here earlier on the thought experiments by Susskind on how one may interpret information gained by the process of entanglement to an observer outside the black hole.
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| See:The elephant and the event horizon 26 October 2006 by Amanda Gefter at New Scientist. |
Also See: Where Susskind leaves off, Seth Lloyd begins
Various neutron interferometry experiments demonstrate the subtlety of the notions of duality and complementarity. By passing through the interferometer, the neutron appears to act as a wave. Yet upon passage, the neutron is subject to gravitation. As the neutron interferometer is rotated through Earth's gravitational field a phase change between the two arms of the interferometer can be observed, accompanied by a change in the constructive and destructive interference of the neutron waves on exit from the interferometer. Some interpretations claim that understanding the interference effect requires one to concede that a single neutron takes both paths through the interferometer at the same time; a single neutron would "be in two places at once", as it were. Since the two paths through a neutron interferometer can be as far as 5 cm to 15 cm apart, the effect is hardly microscopic. This is similar to traditional double-slit and mirror interferometer experiments where the slits (or mirrors) can be arbitrarily far apart. So, in interference and diffraction experiments, neutrons behave the same way as photons (or electrons) of corresponding wavelength. See: Complementarity (physics)
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