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DTSTART:20181102T020000
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DESCRIPTION:Title: &ldquo\;Why Black Hole Information Loss is Paradoxical&r
dquo\;\n\nAbstract: I distinguish between two versions of the black hole i
nformation-loss paradox. The first arises from apparent failure of unitari
ty on the space- time of a completely evaporating black hole\, which appea
rs to be non- globally-hyperbolic\; this is the most commonly discussed ve
rsion of the paradox in the foundational and semi-popular literature\, and
the case for calling it &lsquo\;paradoxical&rsquo\; is less than compelli
ng. But the second arises from a clash between a fully-statistical-mechani
cal interpretation of black hole evaporation and the quantum-field-theoret
ic description used in derivations of the Hawking effect. This version of
the paradox arises long before a black hole completely evaporates\, seems
to be the version that has played a central role in quantum gravity\, and
is genuinely paradoxical. After explicating the paradox\, I discuss the im
plications of more recent work on AdS/CFT duality and on the &lsquo\;Firew
all paradox&rsquo\;\, and conclude that the paradox is if anything now sha
rper. The article is written at a (relatively) introductory level and does
not assume advanced knowledge of quantum gravity.\n\nPP Oct17 Wallace fly
er
DTEND:20181017T171500Z
DTSTAMP:20190121T224451Z
DTSTART:20181017T161500Z
LOCATION:
SEQUENCE:0
SUMMARY:Physics and Philosophy Talk: Prof. David Wallace (USC)
UID:RFCALITEM636836858911584428
X-ALT-DESC;FMTTYPE=text/html:**Title: **&ldquo\;Why Black H
ole Information Loss is Paradoxical&rdquo\;

\n

\nAbstrac
t: I distinguish between two versions of the black hole informati
on-loss paradox. The first arises from apparent failure of unitarity on th
e space- time of a completely evaporating black hole\, which appears to be
non- globally-hyperbolic\; this is the most commonly discussed version of
the paradox in the foundational and semi-popular literature\, and the cas
e for calling it &lsquo\;paradoxical&rsquo\; is less than compelling. But
the second arises from a clash between a fully-statistical-mechanical inte
rpretation of black hole evaporation and the quantum-field-theoretic descr
iption used in derivations of the Hawking effect. This version of the para
dox arises long before a black hole completely evaporates\, seems to be th
e version that has played a central role in quantum gravity\, and is genui
nely paradoxical. After explicating the paradox\, I discuss the implicatio
ns of more recent work on AdS/CFT duality and on the &lsquo\;Firewall para
dox&rsquo\;\, and conclude that the paradox is if anything now sharper. Th
e article is written at a (relatively) introductory level and does not ass
ume advanced knowledge of quantum gravity.

\n

\nPP Oct17 Wallac
e flyer

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