- #1
KFC
- 488
- 4
Hi there,
I am reading a book in which the unitary evolution operator is
[tex]U = \exp(-i H/\hbar)[/tex]
where H is the given Hamiltonian. But in another book, I found that the evolution operator is general given as
[tex]U = \exp(-i \int H(t) dt / \hbar)[/tex]
which one is correct and why there are two expression? Thanks
I am reading a book in which the unitary evolution operator is
[tex]U = \exp(-i H/\hbar)[/tex]
where H is the given Hamiltonian. But in another book, I found that the evolution operator is general given as
[tex]U = \exp(-i \int H(t) dt / \hbar)[/tex]
which one is correct and why there are two expression? Thanks