Recent content by jakob1111

  1. J

    (I'm building an expository wiki at https://physicstravelguide.com and would like to link to...

    (I'm building an expository wiki at https://physicstravelguide.com and would like to link to your list if possible.)
  2. J

    Hi, in your paper "The strange formula of Dr. Koide" you mention your list of phenomenologically...

    Hi, in your paper "The strange formula of Dr. Koide" you mention your list of phenomenologically inspired relationships, which is supposed to be available at http://www.physcomments.org/wiki/index.php?title=Bakery:HdV . This site is no longer online and I was wondering if it is still available...
  3. J

    Relativity Gauge Fields, Knots And Gravity by Baez/Muniain

    The book is amazing. If you get stuck somewhere, I recommend having a look at the http://michaelnielsen.org/blog/yang_mills.pdfn. His alternative formulations often help to understand things better.
  4. J

    Other Finding Reading Notes for Textbooks

    Nothing specific. I would just like to see if there exist other reading notes that I haven't found so far. (Preferably on popular textbooks like Goldstein, Jackson, etc.)
  5. J

    Other Finding Reading Notes for Textbooks

    Often when I read a chapter in a textbook and don't understand something, I find "reading notes" by other students extremely helpful. Oftentimes in these notes other readers have simply written down summaries of the sections in their own words. These descriptions of the "same thing" in...
  6. J

    B Unelegant, Unnatural, Ugly BSM theme books

    @star apple regarding you original question: You can find a list of books in the same spirit as Woit's and Smolin's here, and essays written in a similar spirit here.
  7. J

    A Ed Witten on Symmetry and Emergence

    Fredrik, reading your comment about different "mindsets" I was immediately reminded of the following quote by Tony Zee: "Indeed, a Fields Medalist once told me that top mathematicians secretly think like physicists and after they work out the broad outline of a proof they then dress it up with...
  8. J

    A Ed Witten on Symmetry and Emergence

    All this disagreement and confusion about the status of "gauge symmetry" is really puzzling. So many smart people say things that are simply not true, at least not in general. In addition to the guys mentioned above, other prominent example would be Arkani-Hamed, who also likes to stress that...
  9. J

    A Is it possible that a particle is much heavier through a loop correction

    Let's assume, we have standard model singlet particle s that mixes after electroweak symmetry breaking with an exotic, vectorlike neutral lepton N The relevant part of the Lagrangian reads $$ L \supset h^c s N + h s N^c + M N N^c, $$ where h is the standard model higgs and M is a superheavy...
  10. J

    A Any good idea how non-abelian gauge symmetries emerge?

    Simply because I've never seen a similar story for the origin of non-abelian gauge symmetries :D If you know any reference where this is explained or have an idea how the story could go for non-abelian gauge symmetries, please let me know!
  11. J

    A Any good idea how non-abelian gauge symmetries emerge?

    I think the story where abelian, i.e. U(1), gauge symmetry comes from is pretty straight-forward: We describe massless spin 1 particles, which have only two physical degrees of freedom, with a spin 1 field, which is represented by a four-vector. This four-vector has 4 entries and therefore too...
  12. J

    A Breaking of a local symmetry is impossible, so what about global symmetry....

    Thanks, however the author does not mention that there is actually symmetry breaking. The local symmetry is not and can not be broken. However, a global subgroup of it is actually broken I think, and in this sense there is symmetry breaking in the Higgs mechanism happening.
  13. J

    A Do the equations of motion simply tell us which degrees of freedom apply?

    Sure, the connection between degrees of freedom and conservation laws is pretty straight-forward. However, as far as I know, the equations of motions, like the Dirac equation, the Klein-Gordon equation etc. do not follow from Noether's theorem. However, in some sense we can understand them as...
  14. J

    A Breaking of a local symmetry is impossible, so what about global symmetry....

    Breaking of a local symmetry is impossible. It is often said that therefore the role of the Higgs mechanism in the standard model is a different one. Namely, Once a gauge is fixed, however, to remove the redundant degrees of freedom, the remaining (discrete!) global symmetry may undergo...
  15. J

    A Do the equations of motion simply tell us which degrees of freedom apply?

    A massless spin 1 particle has 2 degrees of freedom. However, we usually describe it using four-vectors, which have four components. Hence, somehow we must get rid of the superfluous degrees of freedom. This job is done by the Maxwell equations. To quote from Gilmore's "Lie Groups, Physics, and...
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