[Pw_forum] electron phonon interaction in ph.x

[degironc]

Jin Zhang wrote:

> 2. dyn(iat, jat): The dynamical matrix which obeys -- dyn^{\diag} * 
> amass * dyn = 1

I don't think dymanical matric should obey this relation...

EIGENVECTORS,  U,  of the generalized problem Dyn U = M U omega^2  will obey
U^\dagger M U = 1 or something like that...
while
EIGENVECTORS, V=\sqrtM U of problem 1/sqrtM Dyn 1/sqrtM V = omega^2 V
will obey V^\dagger V = 1

stefano