# Klein-gordan eqn

1. Aug 15, 2008

### captain

I am having trouble understand why the klein-gordan eqn is accepted to describe spin 0 particles since it gives the wrong statistical interpretation (such as negative probablities).

2. Aug 15, 2008

### Fra

Instead of trying to answer, I'll add another question without insinuating anything.

Why have we not observed any supposedly fundamental spin-0 particles in nature? :)

(higgs hasn't been observed)

/Fredrik

3. Aug 15, 2008

### clem

The Klein-Gordan equation has to be second quantized to get to a QM wave function.
As a one particle equation, $$\psi^*\psi$$ relates to the charge density.