20080419, 19:15  #1 
Bamboozled!
"๐บ๐๐ท๐ท๐ญ"
May 2003
Down not across
3·3,529 Posts 
Quantum field theory
Around 1980, Nobel laureate Steven Weinberg went on the lecture circuit. I was just a lowly (chemistry) grad student when he reached Oxford. During his lecture he recounted the standard mechanical model to illustrate how particles may interact by exchanging virtual particles. He observed that the standard model was a purely repulsive force and offered to buy a drink for anyone who could produce an attractive force by particle exchange.
if you've not seen the standard model, it goes like this. Fit two tennis players with rollerskates and let them hit and return tennis balls to each other. When a player hits a ball, the momentum they impart to the ball means that they roll away from the net. As the game progresses, both players recede from the net and so from each other. An observer who can not see the tennis balls concludes that the players are subject to a repulsive force. After the lecture, a small gaggle of audience members, including myself and Roger Penrose, went down to the front to expound their ideas. Roger went before me and his idea was rather cute. Consider a tennis match played in a tank of water. The players are wearing breating apparatus and are standing on the ceiling. As tennis balls are less dense than water, hitting one of them imparts negative net momentum... Steven Weinberg then explained that what he really wanted was a game played between men and women whereby men attracted women, and vice versa, but samesex couples repelled each other. Nobody then present had a solution. After thinking about the problem off and on for almost 30 years, I recently came up with a solution. Steven Weinberg has now sent me an email acknowledging that he owes me a drink. I won't reveal my solution so that you have a chance of solving the problem. Paul 
20080419, 19:32  #2 
"Lucan"
Dec 2006
England
2×3×13×83 Posts 
To add unnecessary muddying of the water here, I recall
that the motion of the a viscosityfree fluid contributes the mass of half the volume of fluid the ball displaces to these scenarios. Last fiddled with by davieddy on 20080419 at 20:22 
20080419, 20:16  #3 
"Lucan"
Dec 2006
England
6474_{10} Posts 

20080420, 07:54  #4 
Bamboozled!
"๐บ๐๐ท๐ท๐ญ"
May 2003
Down not across
10100101011011_{2} Posts 

20080420, 15:18  #5 
"Lucan"
Dec 2006
England
2·3·13·83 Posts 
There may be homosexual animals, but have you seen
a homosexual proton? BTW I think I read a good answer to the problem in a semipopular book, but damned if I can remember it. My first instinct says "negative mass" but photons are massless. Hope your answer will be illuminating. BTW2 I hate the description of the Higg's field as some sort of treacle. Viscosity opposes velocity, whereas mass opposes change in velocity. David Last fiddled with by davieddy on 20080420 at 15:39 
20080420, 15:37  #6 
Undefined
"The unspeakable one"
Jun 2006
My evil lair
17BB_{16} Posts 

20080420, 15:55  #7  
"Lucan"
Dec 2006
England
6474_{10} Posts 
Quote:
Init Last fiddled with by davieddy on 20080420 at 16:14 

20080420, 21:24  #8 
"Mike"
Aug 2002
7979_{10} Posts 

20080421, 13:55  #9 
Undefined
"The unspeakable one"
Jun 2006
My evil lair
3^{5}×5^{2} Posts 

20080421, 20:26  #11  
Nov 2004
1000011100_{2} Posts 
Quote:
I'm wondering if it can be done with something akin to the waveparticle duality of light. Maybe the tennis ball has different propoperties when hit between differentsex players than when hit between samesex players, in the same way that light appears to have the properties of a particle in certain experiments, but has properties of a wave in others. Stumped, but pondering... Norm 

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