- #1
LAHLH
- 409
- 1
Hi,
Why would having [tex] \partial\psi\partial\psi [/tex] lead to a Hamiltonian that is unbounded below? Srednicki states that in order to have a bounded Hamiltonian one must include [tex]\psi^{\dag} [/tex] in the combination too.
Also why exactly do we require or Lagrangian to be Hermitian, is this somehow to give real eigenvalues for observables like in QM?
cheers
Why would having [tex] \partial\psi\partial\psi [/tex] lead to a Hamiltonian that is unbounded below? Srednicki states that in order to have a bounded Hamiltonian one must include [tex]\psi^{\dag} [/tex] in the combination too.
Also why exactly do we require or Lagrangian to be Hermitian, is this somehow to give real eigenvalues for observables like in QM?
cheers