Wednesday, August 22, 2018

quantum electrodynamics - Canonical equal time commutation relations in QED


I understand that to quantize the classical electromagnetic field one needs to impose commutation relations and express the field in terms of creation and annihilation operators. I notice that the canonical equal-time commutation rule comes in to use here. How do you derive this? What is it meant to represent? enter image description here


Also, how do you prove the following commutation relation?


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classical mechanics - Moment of a force about a given axis (Torque) - Scalar or vectorial?

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