X-Message-Number: 8116
Date: 21 Apr 97 05:13:01 EDT
From: yvan Bozzonetti <>
Subject: CRYONICS The limits of recovery

From K. Lynch, #8108:

>> ... 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. ...
>
>Sure.  But much of what you would need to time-reverse consists of
>infrared photons racing away from Earth in all directions at the speed
>of light.  Even if we were able to detect and analyze all photons over
>an area of many square light-years, first we would have to travel
>faster than light to get ahead of them.

...No more than you need to do so to cool the inside of a fridge. You don't

really get back in time: The entropy on the full system (ordinary matter + black
hole) is not reduced, your argument is for a *general* and *real* inversion of

the time arrow,  not for a refrigerator-like system. A more constructive comment
could have pointed out the necessity to use extremal-like BH structures, if not
the BH horizon itself could go back in time in taking a more extremal
configuration.

		Yvan Bozzonetti.

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