March 2001 - cypherpunks-legacy

Binary Black Hole Grand Challenge - What is LIGO?
by Jim Choate 31 Mar '01

31 Mar '01

http://wwwrel.ph.utexas.edu/Center/GC/page1.html -- ____________________________________________________________________ Beware gentle knight, there is no greater monster than reason. Miguel de Cervantes The Armadillo Group ,::////;::-. James Choate Austin, Tx /:'///// ``::>/|/ ravage(a)ssz.com www.ssz.com .', |||| `/( e\ 512-451-7087 -====~~mm-'`-```-mm --'- --------------------------------------------------------------------

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Re: update.532 [Black Hole Computing]
by Bill Stewart 31 Mar '01

31 Mar '01

That was very interesting. Kind of reminds me of Cypherpunks Semi-Arch-Nemesis David Brin's "Earth", where people messing around with small black hole creation cause the risk of Bad Things happening. In practice, we're less likely to see black hole computers developed than Nanotech Grey Goo computers, At 01:41 PM 03/31/2001 -0600, Jim Choate wrote: >PROGRAMMABLE BLACK HOLE COMPUTERS. One usually >thinks of a black hole as an omnivorous object swallowing energy >and spitting some of it back in the form of Hawking evaporation >radiation, consisting of particles created in pairs out of the vacuum >near the edge of the black hole. In principle, a tiny black hole can >be formed in a way that encodes instructions for performing >calculations. Correspondingly, the answers could be read out from >the escaping Hawking radiation. Why use a black hole at all? >.... >of detecting gravity waves with LIGO and other interferometric Does "LIGO" stand for "Light In, Garbage Out"? :-)

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Phillip Morris ID database?
by dmolnar 31 Mar '01

31 Mar '01

I walked into the local 7-11 today. There was a scanner there and a man next to it offering a free pack of cigarettes if he could scan your drivers' license or other form of photo ID *and* you are an adult smoker. When I asked what this was all about, he told me that Phillip Morris is trying to "update their ID database." Various promotional material was present as well, but I didn't read any of it. Does anyone know more about this? Does Phillip Morris have an ID database, and how often do they update it? thanks, -David

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update.532 (fwd)
by Jim Choate 31 Mar '01

31 Mar '01

---------- Forwarded message ---------- Date: Thu, 29 Mar 2001 12:04:36 -0500 (EST) From: AIP listserver <physnews(a)aip.org> To: physnews-mailing(a)aip.org Subject: update.532 PHYSICS NEWS UPDATE The American Institute of Physics Bulletin of Physics News Number 532 March 28, 2001 by Phillip F. Schewe, Ben Stein, and James Riordon PROGRAMMABLE BLACK HOLE COMPUTERS. One usually thinks of a black hole as an omnivorous object swallowing energy and spitting some of it back in the form of Hawking evaporation radiation, consisting of particles created in pairs out of the vacuum near the edge of the black hole. In principle, a tiny black hole can be formed in a way that encodes instructions for performing calculations. Correspondingly, the answers could be read out from the escaping Hawking radiation. Why use a black hole at all? Because of the presumed tremendous density of information and potential processing speed implicit in the extreme black hole environment. Seth Lloyd of MIT has previously addressed himself to calculating the conceivable limits on the computing power of such a black hole computer (Nature, 31 August 2000) and arrives at a maximum processing speed of about 10^51 operations/sec for a 1-kg black hole. Now Jack Ng of the University of North Carolina yjng(a)physics.unc.edu, 919-962-7208) extends this study by asking whether the very foaminess of spacetime, thought to arise at the level of 10^-35 m, provides an alternative way to limit theoretical computation. Ng not only finds that it does but that the foaminess of spacetime leads to an uncertainty in timekeeping (the more accurate the clock, the shorter its lifetime) which in turn leads to a bound on information processing (speed and memory simultaneously) analogous to the Heisenberg bound on simultaneous measurement of momentum and position. These limits are so generous that they normally pose little problem for ordinary physical measurements, but in the case of black hole computer the limits would apply immediately. Ng adds, apropos of detecting gravity waves with LIGO and other interferometric devices, that in addition to accounting for various forms of noise, such as seismic disturbances or thermal noise in the detectors, the faint gurgle of spacetime foam will eventually have to be included as an additional and unavoidable source of noise in the measurement of very short displacements (the movement of mirrors owing to the flexings of spacetime brought about by passing gravity waves). If Ng is right, the noise sensitivity achievable by the prospective advanced phase of LIGO will only need a further hundredfold enhancement in order to detect the quantum foam, which is to say the very fabric of spacetime. Thus the Planck scale, so far only a hypothetical extreme regime, might eventually become a realm that can be approached and measured. (Physical Review Letters, 2 April 2001.) A BOSE EINSTEIN CONDENSATE (BEC) IN HELIUM has [SSZ: text deleted] FUSION AVALANCHES. Providing more than child's play, [SSZ: text deleted] CORRECTION: Researchers at IBM have not yet made an integrated circuit of carbon nanotubes (Update 531). Rather, Phaedon Avouris and Philip Collins of IBM have announced a scheme for the fabrication of large arrays of nanotubes. They also put together one p-type nanotube transistor and one n-type transistor to form a working logic NOT gate. ____________________________________________________________________ Beware gentle knight, there is no greater monster than reason. Miguel de Cervantes The Armadillo Group ,::////;::-. James Choate Austin, Tx /:'///// ``::>/|/ ravage(a)ssz.com www.ssz.com .', |||| `/( e\ 512-451-7087 -====~~mm-'`-```-mm --'- --------------------------------------------------------------------

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re: enjoy this
by Tom＠toad.com 31 Mar '01

31 Mar '01

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by Pete Giordano 31 Mar '01

31 Mar '01

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by Tonya＠einstein.ssz.com 31 Mar '01

31 Mar '01

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by base sales 31 Mar '01

31 Mar '01

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by team＠adultfriendfinder.com 31 Mar '01

31 Mar '01

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The Register - Virtual Anonymous Web Surfing Expands to Europe
by Jim Choate 31 Mar '01

31 Mar '01

http://www.theregister.co.uk/content/8/18017.html -- ____________________________________________________________________ Beware gentle knight, there is no greater monster than reason. Miguel de Cervantes The Armadillo Group ,::////;::-. James Choate Austin, Tx /:'///// ``::>/|/ ravage(a)ssz.com www.ssz.com .', |||| `/( e\ 512-451-7087 -====~~mm-'`-```-mm --'- --------------------------------------------------------------------

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