L3.2 Degeneracy resolved to first order; state and energy corrections

MIT 8.06 Quantum Physics III, Spring 2018
Instructor: Barton Zwiebach
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L3.2 Degeneracy resolved to first order; state and energy corrections
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[@ivayloangelov1659]

I would like to thank you very much for the content and make one small remark regarding the term Prof. Zwiebach writes down at 17:58 ...
I think that, following the results from lecture 2.4, the term captured by the curly brace (and just that) should be E_{n,q} ^ (1) * delta_{lq} instead of E_{n,l} ^ (1) * delta_{lq}...
Then, after evaluating the delta function, the only left term is the one for q=l.
I would be happy about feedback and wish you all the best!

[@boblin9263]

It only depends on which side of you deltaH acting on. If you act on the left side, then you get the E_{n.l}.

[@geotheo10550]

at 22:10, when he solves for the second order E(n,k), it is beautiful that [kronker delta](l,k)=1

[@leytonzhang5607]

so good

[@mantusah9660]

Flawless explaination!

[@nirmalghorai8209]

good!

[@amansingh4992]

I was here on 17-12-2019

[@mangostamanable]

hahaha I really would have liked to be there and meet Professor Barton, his classes are pretty amazing

[@brainstormingsharing1309]

👍👍👍👍👍👍👍👍