- #1
omyojj
- 37
- 0
Hi, guys..This is my first time to post. and I got to aplogize for my bad English..I`m a novice..;;
anyway..here`s my curiosity..
From Paul Dirac`s Principles of Quantum Mechanics..p.153
(section of Motion in a central field of force)
It says that
The angular momentum L of the ptl about the orgin ..and its magnitude L^2 commute with r and p_r since they are scalars...
It`s not hard to verify that [L, r] = [L, p_r] = 0
(L_x=x*p_y-y*p_x, r=(x^2+y^2+z^2)^(1/2) etc.)
But I just want to understand the underlying physics..
commutator(Quantum Poisson`s Bracket) with L zero?
Are they concerned with conservation of angular momentum? or else?
:)
anyway..here`s my curiosity..
From Paul Dirac`s Principles of Quantum Mechanics..p.153
(section of Motion in a central field of force)
It says that
The angular momentum L of the ptl about the orgin ..and its magnitude L^2 commute with r and p_r since they are scalars...
It`s not hard to verify that [L, r] = [L, p_r] = 0
(L_x=x*p_y-y*p_x, r=(x^2+y^2+z^2)^(1/2) etc.)
But I just want to understand the underlying physics..
commutator(Quantum Poisson`s Bracket) with L zero?
Are they concerned with conservation of angular momentum? or else?
:)