Time dependence of expectation values

[@renrenhamster1535]

Note that this assumes that the operator does not have a time dependence

[@BihagDave]

Thanks, had the same doubt.

[@acer1210]

only if the operator commutes with Hamiltonian "H" :) Hope you are still here and fine.

[@lumpi806]

At 1:03 ; I suppose the teacher assumes that Q has not time dependance...

[@Iceyer-su1et]

I have a question: Why does he think that Φ(k) does not explicitly depend on time, i.e., it should not be written as Φ(k, t)?

[@BernardBernouli]

Operators in the Schrödinger Picture can only have explicit time dependence and are usually assumed to be time independent. Only exception being the time-evolution operator as it serves a very different function from other operators. That I think is why he assumes a time independent Q.

[@grishabuckareff]

Why does H lose its hat in the commutator? Is it no longer an operator?

[@yyc3491]

It should have a hat.

[@nicktohzyu]

but at 1:30 how does he assume dt and Q commute?

[@ゾカリクゾ]

had the same doubt

[@jacobvandijk6525]

In my opinion, TIME isn't an operator in QM.

[@ramaraju7221]

Because he assumed that Q is time independent

[@nathanherling9836]

Q lost its hat @2:50