I my course we calculated the Klein-Gordon field:
ϕ(x)=∫d3k(2π)312k0 [a(→k)e−ik.x+b∗(→k)eikx]
We said that the part a(→k)e−ikx 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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