since the time derivative is second order, the KG equation can not be put in the form(adsbygoogle = window.adsbygoogle || []).push({});

i \dot{\psi}= H \psi

so there is no H in KG equation?

and no heisenberg picture for KG equation?

**Physics Forums | Science Articles, Homework Help, Discussion**

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# What is the hamiltonian in Klein-Gordon equation?

**Physics Forums | Science Articles, Homework Help, Discussion**