phy-4600/lecture_notes/1-27/Expectation Value Time Dependence

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2016-02-12 17:26:39 +00:00
2016-02-24 15:26:01 +00:00
Computed Derivative d/dt <Â>:
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d <Â> = d 〈Ψ(t)|Â|Ψ(t)〉
dt dt
⎛d 〈Ψ(t)⎞ Â|Ψ(t)〉 + 〈Ψ(t)|Â ⎛d Ψ(t)〉⎞ + 〈Ψ(t)|d Â|Ψ(t)〉
⎝dt ⎠ ⎝dt ⎠ dt
ι 〈Ψ(t)|Ĥ Â|Ψ(t)〉 + 〈Ψ(t)|Â Ĥ -ι|Ψ(t)〉 + 〈Ψ(t)|d Â|Ψ(t)〉
ħ ħ dt
ι 〈Ψ(t)|Ĥ Â - Â Ĥ|Ψ(t)〉 + 〈Ψ(t)|d Â|Ψ(t)〉
ħ dt
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