Complex scalar field

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I wanted to ask a quick question about the complex scalar field. My question is that does the scalar field need to be complex in order to include the part for anti-particles or do you regards the scalar field for particles and anti-particles seperate. I saw this specifically when you second quantization to quantize the scalar field that satisfies the Klein-Gordon equation. Are there any advantages and disadvantages of making the scalar field complex if it really doesn't apply to what I mentioned above? Thanks in advance for anybody who can clarify this question.
 

Ben Niehoff

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If the field is real, then the particle is its own antiparticle. Note that a real KG field is uncharged.

So, one uses complex KG fields to model spin-0, charged particles, such as the charged pions. (The neutral pion is modeled using a real KG field).
 
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If the field is real, then the particle is its own antiparticle. Note that a real KG field is uncharged.
Not necessarily, according to Shroedinger (Nature (1952), v.169, p.538). I mentioned this article in several posts.
 

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