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. Rate This Message: http://www.cryonet.org/cgi-bin/rate.cgi?msg=8116