[ExI] [NSG-d] Alice Through the Event Horizon

[Eugen Leitl]

----- Forwarded message from Steve Witham <sw at tiac.net> -----

Date: Thu, 15 Aug 2013 22:04:32 -0400
From: Steve Witham <sw at tiac.net>
To: Nanotechnology Study Group - open discussion <nsg-d at marshome.org>
Subject: [NSG-d] Alice Through the Event Horizon
Reply-To: Nanotechnology Study Group - open discussion <nsg-d at marshome.org>

There's a new paradox at the intersection of quantum physics and
general relativity.  In my dim understanding,

Alice and Bob have become entangled.  They travel close to a big black
hole, and Alice goes in, she crosses the event horizon.

General relativity says, she shouldn't notice anything special
happening at that point, not until she actually gets close to the
singularity.

Meanwhile, the black hole is splitting virtual entangled particle
pairs, pulling one of each pair inward at the event horizon and
allowing the other to escape to the outside.

Something about, for the information in the black hole to be
conserved, the outgoing radiation must become entangled with other
stuff outside the event horizon.

E.g., Bob.  But Bob can't be entangled with both Alice and the
outgoing particle.

So, something has to give, one of the principles I've handwaved at
above.  If it's Alice's smooth trip, the alternative seems to be, she
instantly gets fried on crossing the event horizon, it's a "firewall."
The energy represented by her entanglement with Bob is dumped into her
when Bob gets involved with the other particle and breaks off the
affair, so to speak.

Alice seems to be a candidate for a position right up there with
Schroedinger's Cat.

I hope I have added sufficiently to the confusion to interest you.

https://www.simonsfoundation.org/quanta/20121221-alice-and-bob-meet-the-wall-of-fire/

 --Steve
_______________________________________
Nanotechnology Study Group NSG-d open discussion group
http://www.marshome.org/mailman/listinfo/nsg-d
Send replies (no attachments) to:   NSG-d___no-spam at marshome.org
Questions for list admin: NSG-d-owner___no-spam at marshome.org
Archive: http://MarsHome.org/mailman/private/NSG-d
Unsubscribe: NSG-d-unsubscribe at marshome.org
Password or Options or Unsubscribe: http://MarsHome.org/mailman/options/NSG-d
Hosted by CyberTeams.com and Mars Foundation(tm), http://MarsHome.org

----- End forwarded message -----
-- 
Eugen* Leitl <a href="http://leitl.org">leitl</a> http://leitl.org
______________________________________________________________
ICBM: 48.07100, 11.36820 http://ativel.com http://postbiota.org
AC894EC5: 38A5 5F46 A4FF 59B8 336B  47EE F46E 3489 AC89 4EC5