Timeline for Confusion in Proof of Noether's theorem
Current License: CC BY-SA 4.0
10 events
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| May 2, 2019 at 15:05 | history | edited | knzhou | CC BY-SA 4.0 |
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| May 2, 2019 at 10:19 | history | edited | knzhou | CC BY-SA 4.0 |
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| May 2, 2019 at 10:18 | comment | added | knzhou | @DvijMankad I wasn't aware! I do know that Srednicki is less sloppy than a lot of other QFT texts but I haven't gone through it in detail. | |
| May 2, 2019 at 10:01 | vote | accept | amilton moreira | ||
| May 2, 2019 at 9:07 | comment | added | user87745 | @knzhou I think Srednicki's presentation in Chapter $22$ is pretty similar to what you are saying. He doesn't consider any coordinate changes at all and talks purely about true field transformations at each point with the coordinates untouched, i.e., $\phi(x)\to\phi(x)+\delta\phi(x)$. This seems to make it manifest that we are not doing some trivial transformations. Correct me if there is some subtle sloppiness I am missing. | |
| May 2, 2019 at 8:59 | comment | added | knzhou | @amiltonmoreira Sorry, I don't have one from a textbook; if anything they just get more and more sloppy the more advanced they get. But do look at the top answers in the questions you linked earlier, they're good. | |
| May 2, 2019 at 8:56 | comment | added | amilton moreira | could you give me a reference where this proof is made right? | |
| May 2, 2019 at 8:55 | comment | added | knzhou | @amiltonmoreira Because they learned it from other people who also used this bad presentation. It's sad but true: there are about 50 things in the undergraduate physics curriculum that are almost always presented extremely poorly by tradition, and this is one of them. Everybody I know has had to get around each of these potholes themselves. | |
| May 2, 2019 at 8:53 | comment | added | amilton moreira | you are right. But my question is why the text books insist in this presentation? | |
| May 2, 2019 at 8:40 | history | answered | knzhou | CC BY-SA 4.0 |