It's conserved because we require that the Hamiltonian not be explicitly 
time dependent (we want our laws to apply equally at all times); that 
and Noether's theorem imply conservation of 4-momentum.

Brent Meeker

Michael Rosefield wrote:
> To pull a fatuous idea from where the sun doth not shine, what if 
> energy is merely moving 'between universes'; it is conserved just 
> because of statistical balance.
> On 17/04/2008, *Brent Meeker* <[EMAIL PROTECTED] 
> <mailto:[EMAIL PROTECTED]>> wrote:
>     I'm not sure what source of photon creation you have in mind, but QFT
>     doesn't allow violation of energy conservation.
> -- 
> "They couldn't hit an elephant at this dist-"
> Last words of Gen. John Sedgwick, spoken as he looked out over the 
> parapet at enemy lines during the Battle of Spotsylvania in 1864.
> >

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