Saturday, September 10, 2016

special relativity - Klein gordon field and positive/negative energy solutions


I my course we calculated the Klein-Gordon field:


ϕ(x)=d3k(2π)312k0 [a(k)eik.x+b(k)eikx]


We said that the part a(k)eikx correspond to the positive energies solutions, and the part b(k)eikx to the negative ones. (We are not doing quantum mechanics here, a(k) and b(k) are numbers).


Why do we say this?




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