X-Message-Number: 8098
Date: 17 Apr 97 13:44:27 EDT
From: yvan Bozzonetti <>
Subject: CRYONICS The limits of recovery


Late or soon, we will be able to recover well preserved cryonics patients. There
is a risk: At that time, cryonics operators may feel they have a good
understanding of what is possible and what is not. Most of the first patients
and sub optimal freezing operations may be doomed as definitively impossible.
Nanotech repair atom per atom may end as a pipe dream, so that such cryonics
case would be discarded because of the success of a first generation recovery.
So I think it may be important to keep in mind the possibility of recovery
systems not based on biology, biochemistry or nanotech.

	As an example, I'll take an extreme case, the socalled hamburger state.
Assume a corpse has been turned into such a state or indeed any similar one.

Now, if we could reverse time, at least in a localized domain, we could send the
matter on its time reversal course and get back the full ordered system: a
living corpse. This is *simply* a reversal of the second thermodynamics law
about entropy. The time arrow is indeed defined by the impossibility to reduce
entropy in a closed system.

	If the *closed system* contains two componements, the hamburger and a
black hole, most of the entropy is locked on the black hole surface. If the ham
and BH have similar masses, more than 99.9999 per cent of the total entropy is
on the BH. If a very small part of the ham mass falls on the BH, the BH surface
expands and its entropy is proportional its surface. Because the system is

closed and that experiment may be done without adding entropy to the system, the

big gain on the BH must comes from the ham. This one would be cooled to absolute
zero temperature without be able to give the requested entropy amount. It would
then have no other solution that going back into time to pay the bill.

	At first that seem impossible: all we can see in a given volume would
evolve back in time. The BH would be smaller than an atom and would look indeed
negligible. Well, in reality, the largest chunk of entropy would have increased
and there is no probmen with physical laws. At that level, this is a think
experiment, because nobody has a BH at hand. On the other hand, we may not need
a real black hole to exploit the phenomenon. There is the abstract of an
interesting physical paper:

>>>>\\
Paper: gr-qc/9703076
From: Benni Reznik <>
Date: Wed, 26 Mar 1997 13:39:30 MST   (20kb)

Title: Origin of the Thermal Radiation in a Solid-State Analog of a Black-Hole
Authors: B. Reznik
Comments: 13 Pages, 3 figures, Revtex with epsf macros
Report-no: LAUR-97-1055
\\
  An effective black-hole-like horizon occurs, for electromagnetic waves in
matter, at a surface of singular electric and magnetic permeabilities. In a
physical dispersive medium this horizon disappears for wave numbers with
$k>k_c$. Nevertheless, it is shown that Hawking radiation is still emitted if
free field modes with $k>k_c$ are in their ground state.
\\

	Someday, that information could be useful for those cryonics operators
who will have to think about the possibility or not of recovery of such or such
case.

		Yvan Bozzonetti.

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