L21.3 Integral equation for scattering and Green's function

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MIT 8.06 Quantum Physics III, Spring 2018
Instructor: Barton Zwiebach
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L21.2 Integral equation for scattering and Green's function
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@yomboh7033 3 жыл бұрын

とても分かりやすくて感動致しました。非常に大らかかつ表現性のある喋り方で、心地よく内容を理解することができました。 I was really moved by the informative expression by Barton Zwiebach! He speaks in really fun and informative way which is easy to understand for me Japanese.

@him31anshu Жыл бұрын

I have been looking for this for 3 years!! It was here all the time!

@physicsboy3108 4 жыл бұрын

Really he had mastered Quantum Mechanics in present era of physics!!!

@Higgsinophysics 5 жыл бұрын

Helped me a lot - thanks for the upload

@dontForgetTheConstantC 2 ай бұрын

nice and neat explanation. thanks so much

@dpavlovsky 5 жыл бұрын

Excellent explanation. Thank you for the upload.

@ey3796 5 жыл бұрын

Bro could you explain the phase approximation done at 27:00?, Cheers.

@skipperglume 4 жыл бұрын

@@ey3796 It was done just to have an approximation for small r primes in compare to r.

@Kathie-ov8lv 4 ай бұрын

@@ey3796 n is the unit vector in the r direction. For a small angle between r' and r (which occurs for r >> r'), projection of r' on the r direction (n.r') is approximately equal to r' itself. Thus we write |r - r'| as approximately equal to |r - n.r'| in the numerator where this term is being multiplied by "k" to keep the possible error under control (instead of writing |r-r'| ~ r as we did for the denominator). And why do we need such an approximation instead of leaving r' just as r'? It is to connote the relation between r and r' instead of treating them as two totally irrelevant vectors/objects in our equation (which would dampen the information we get from the solution).