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JokeRe: This supercomputer will try to find intelligence on Reddit Pin
Brisingr Aerowing16-Aug-16 16:17
professionalBrisingr Aerowing16-Aug-16 16:17 
GeneralRe: This supercomputer will try to find intelligence on Reddit Pin
Dan Neely17-Aug-16 3:08
Dan Neely17-Aug-16 3:08 
NewsGoogle Duo arrives to take on FaceTime Pin
Kent Sharkey16-Aug-16 7:52
staffKent Sharkey16-Aug-16 7:52 
GeneralRe: Google Duo arrives to take on FaceTime Pin
Kornfeld Eliyahu Peter16-Aug-16 8:02
professionalKornfeld Eliyahu Peter16-Aug-16 8:02 
NewsAll Windows 10 PCs will get Windows Holographic access next year Pin
Kent Sharkey16-Aug-16 7:51
staffKent Sharkey16-Aug-16 7:51 
GeneralRe: All Windows 10 PCs will get Windows Holographic access next year Pin
Dan Neely17-Aug-16 3:12
Dan Neely17-Aug-16 3:12 
NewsTabletop black hole yields evidence of Hawking radiation Pin
Kent Sharkey15-Aug-16 14:01
staffKent Sharkey15-Aug-16 14:01 
GeneralRe: Tabletop black hole yields evidence of Hawking radiation Pin
Daniel Pfeffer15-Aug-16 22:34
professionalDaniel Pfeffer15-Aug-16 22:34 
Given that sonic "black holes" are a non-relativistic phenomenon, this would seem to imply that Hawking radiation occurs even (only?) in a non-relativistic environment. A relativistic environment would appear to give different results:
  1. The energy required to create a virtual pair of particles may only be borrowed for a time shorter than h/E, where h is Planck's constant and E is the total energy of the particles.
  2. During this time, the particles cannot travel more than a distance of hc/E, where c is the speed of light.
  3. In order to escape the black hole, the "surviving" particle will experience a gravitational red shift, which will change the spectrum of the emitted radiation.
  4. The gravitational red shift will be greater for particles closer to the event horizon, i.e. for the more energetic particles.
The above points appear to imply that if the radiation from a real black hole is "black body" radiation, the radiation from the sonic "black hole" will not be "black body".

Any physicists are welcome to correct me. Smile | :)
If you have an important point to make, don't try to be subtle or clever. Use a pile driver. Hit the point once. Then come back and hit it again. Then hit it a third time - a tremendous whack.

--Winston Churchill

GeneralRe: Tabletop black hole yields evidence of Hawking radiation Pin
Bassam Abdul-Baki16-Aug-16 0:26
professionalBassam Abdul-Baki16-Aug-16 0:26 
GeneralRe: Tabletop black hole yields evidence of Hawking radiation Pin
Basildane16-Aug-16 1:24
Basildane16-Aug-16 1:24 
NewsIntroducing the .NET Framework Monthly Rollup Pin
Kent Sharkey15-Aug-16 13:05
staffKent Sharkey15-Aug-16 13:05 
GeneralRe: Introducing the .NET Framework Monthly Rollup Pin
Wonde Tadesse15-Aug-16 16:27
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NewsHackers say they hacked NSA-linked group, want 1 million bitcoins to share more Pin
Kent Sharkey15-Aug-16 12:31
staffKent Sharkey15-Aug-16 12:31 
GeneralRe: Hackers say they hacked NSA-linked group, want 1 million bitcoins to share more Pin
Beginner Luck15-Aug-16 15:49
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NewsEnd to free upgrade halts rapid Windows 10 growth Pin
Kent Sharkey15-Aug-16 11:42
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GeneralRe: End to free upgrade halts rapid Windows 10 growth Pin
Beginner Luck15-Aug-16 15:42
professionalBeginner Luck15-Aug-16 15:42 
GeneralRe: End to free upgrade halts rapid Windows 10 growth Pin
User 5924115-Aug-16 19:40
User 5924115-Aug-16 19:40 
NewsPhysicists confirm possible discovery of fifth force of nature Pin
Kent Sharkey15-Aug-16 11:02
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GeneralRe: Physicists confirm possible discovery of fifth force of nature Pin
Marc Clifton15-Aug-16 11:31
mvaMarc Clifton15-Aug-16 11:31 
GeneralRe: Physicists confirm possible discovery of fifth force of nature Pin
Kent Sharkey15-Aug-16 11:32
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JokeRe: Physicists confirm possible discovery of fifth force of nature Pin
Duncan Edwards Jones15-Aug-16 11:54
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GeneralRe: Physicists confirm possible discovery of fifth force of nature Pin
Shuqian Ying15-Aug-16 12:13
Shuqian Ying15-Aug-16 12:13 
GeneralRe: Physicists confirm possible discovery of fifth force of nature Pin
Kent Sharkey15-Aug-16 16:14
staffKent Sharkey15-Aug-16 16:14 
GeneralRe: Physicists confirm possible discovery of fifth force of nature Pin
Shuqian Ying15-Aug-16 23:00
Shuqian Ying15-Aug-16 23:00 
GeneralRe: Physicists confirm possible discovery of fifth force of nature Pin
TheGreatAndPowerfulOz17-Aug-16 8:39
TheGreatAndPowerfulOz17-Aug-16 8:39 

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