So there's something I don't quite understand.(adsbygoogle = window.adsbygoogle || []).push({});

The density in the KG equation stands for charge density. Here are several questions:

1. For a KG particle, how do I (if it all) find the position probabilty density?

2. For a Dirac particle, what does the (now positive definite) density stand for?

3. For a now KG or Dirac field, is there no position probability density?

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# One-particle Dirac and KG equations

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