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Re: Dirac's negative energy sea 
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#1
Nov406, 03:24 PM

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"Of course, the "negative energy sea" is sort of an outdated way of
looking at the Dirac equation. A more elegant approach treats the "negativeenergy" (really, negativefrequency) states as positiveenergy states of antiparticles." There is another way to look at this that treats negative energy states as having negative pressure, where... P=u=rho*c^2 The energy density of the vacuum is less than the matter density, so antiparticles don't arise until vacuum energy gets condensed down over a finite enough area of space to attain positive matter density. In this case, the antigravity effect of the negative pressure vacuum mimics the effect of Dirac's negative mass states, which takes modern physics all the way back to 1917: http://www.lns.cornell.edu/spr/200506/msg0069755.html Modern science has some remedial homework to do before it can make any claims about superior "elegance". 


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