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VERSION:2.0
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DTSTAMP:20260920T225006Z
LAST-MODIFIED:20191022T134316Z
DTSTART:20191030T201500Z
DTEND:20191030T211500Z
UID:event2198@bu.edu
URL:http://physics.bu.edu/internal/events/show/2198
SUMMARY:Entanglement Islands and the Page Curve
DESCRIPTION:Featuring Raghu Mahajan\, Princeton\n\nPart of the HET Seminar 
	Series.\n\nWe consider a gravity theory coupled to matter\, where the matte
	r has a higher-dimensional holographic dual. In such a theory\, finding qua
	ntum extremal surfaces becomes equivalent to finding the RT/HRT surfaces in
	 the higher-dimensional theory. Using this we compute the entropy of Hawkin
	g radiation and argue that it follows the Page curve\, as suggested by rece
	nt computations of the entropy and entanglement wedges for old black holes.
	 The higher-dimensional geometry connects the radiation to the black hole i
	nterior in the spirit of ER=EPR. Inspired by this\, we propose a new rule f
	or computing the entropy of quantum systems entangled with gravitational sy
	stems which involves searching for ``islands'' in determining the entanglem
	ent wedge. We find situations where the island extends {\it outside} the bl
	ack hole horizon. This suggests possible causality paradoxes which we show 
	are avoided because of the quantum focusing conjecture. Finally\, we formul
	ate a version of the information paradox for a black hole in contact with a
	 bath in the Hartle-Hawking state\, and demonstrate the role of islands in 
	resolving this paradox.
LOCATION:PRB 595\, 3 Cummington Mall\, 02215
STATUS:CONFIRMED
CLASS:PUBLIC
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