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michael_nielsen's profile
michael_nielsen
michael_nielsen
michael_nielsen
@michael_nielsen

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michael_nielsen

@michael_nielsen

Searching for the numinous. Co-purveyor of https://quantum.country/ 

San Francisco, CA
michaelnielsen.org
Joined July 2008

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    1. michael_nielsen‏ @michael_nielsen Nov 3
      • Report Tweet

      On the oddly pervasive notion of the conservation of energypic.twitter.com/j0iWw1sbTY

      21 replies 23 retweets 225 likes
      Show this thread
    2. Sujit Nair‏ @carvak Nov 3
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      Replying to @michael_nielsen

      More like pervasive notion of action principle + symmetry, right?

      1 reply 0 retweets 0 likes
    3. michael_nielsen‏ @michael_nielsen Nov 3
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      Replying to @carvak

      Not really. It's possible to get QM from an action principle, but it's pretty artificial (and rarely done, it's quite poorly known).

      1 reply 0 retweets 1 like
    4. Sujit Nair‏ @carvak Nov 3
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      Replying to @michael_nielsen

      Hmm. That was Feynman's PhD thesis. https://cds.cern.ch/record/101498/files/Thesis-1942-Feynman.pdf … Or are you referring to Schwinger’s formulation?

      1 reply 0 retweets 0 likes
    5. michael_nielsen‏ @michael_nielsen Nov 3
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      Replying to @carvak

      I'm not referring to Feynman's sum-over-paths formulation (which every physicist knows). I mean a way of formulating Schroedinger's equation as an entirely classical equation of motion on a classical phase space. Sum-over-paths is something entirely different.

      1 reply 0 retweets 1 like
    6. Sujit Nair‏ @carvak Nov 3
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      Replying to @michael_nielsen

      Interesting! What’s a good reference?

      1 reply 0 retweets 0 likes
      michael_nielsen‏ @michael_nielsen Nov 3
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      Replying to @carvak

      IIRC Kingsley Jones and Steve Weinberg independently wrote some papers about related ideas in the late 1980s. TBH, I can't suggest a particular paper, because I only ever glanced at them. Jones told me the results, and I worked out details in my notes.

      1:39 PM - 3 Nov 2019
      0 replies 0 retweets 0 likes

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