Question about quantization of scalar field

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SUMMARY

The quantization of scalar fields effectively addresses the negative energy problem inherent in the Klein-Gordon equation. This resolution arises because the time dependence of scalar fields is decoupled from the energy of particles, contrasting with the single particle quantum mechanics framework. This distinction allows for a more stable interpretation of energy states in quantum field theory.

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Why the quantization of scalar field resolves the energy negative problem that exist in the klein-gordon equation?
 
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Because the time dependence of the scalar fields is not related to the energy of the particles as it was in single particle quantum mechanics.
 

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