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Mar
10
answered Why don't neutrons cluster on their own?
Feb
29
answered What is special about many-body localization as opposed to Mott insulator
Feb
28
comment Yang-Mills theories, confinement and chiral symmetry breaking
@Name YYY: I'm not an expert, but it would seem that the anomalous effective Lagrangian can always be constructed by heat kernel methods. Note that i) I must still require that the gauge anomalies cancel, ii) I need to know not only G but also G/H (where G is the global symmetry).
Feb
26
comment group velocity of acoustic waves
@Kirill I added a postscript.
Feb
26
revised group velocity of acoustic waves
added 1297 characters in body
Feb
26
comment group velocity of acoustic waves
1) The hydrodynamic limit is indeed subtle. 2) The hydro equations involve the conserved charges, so the corresponding moments of the collision term vanish. 3) To derive the hydro equations from the moment equations, we also need constituitive equations (we need to express the currents in terms of thermodynamic variables). The constituitive equations do depend on the collision term.
Feb
25
comment Yang-Mills theories, confinement and chiral symmetry breaking
@NameYYY : I added a postscript.
Feb
25
revised Yang-Mills theories, confinement and chiral symmetry breaking
added 923 characters in body
Feb
25
comment Nucleon-meson interaction
@NameYYY 1) You do what you can (this was at a time when Witten was still doing some phenomenological work). 2) Well, 30% error is not that great (no of way knowing that it's not a 100%). Also, using a specific lagrangian to find the Skyrmion is an additional approximation beyond large N.
Feb
25
answered group velocity of acoustic waves
Feb
23
comment Dependance of diffusion coefficient on size?
@becko I added a few more comments
Feb
23
revised Dependance of diffusion coefficient on size?
added 1244 characters in body
Feb
23
comment Yang-Mills theories, confinement and chiral symmetry breaking
@NameYYY I could not explain it any better than 't Hooft himself inspirehep.net/record/144074
Feb
23
comment Nucleon-meson interaction
@NameYYY I added some comments about Skyrmions.
Feb
23
revised Nucleon-meson interaction
added 646 characters in body
Feb
23
awarded  Revival
Feb
23
answered Nucleon-meson interaction
Feb
19
comment Total energy of the fluid
@nluigi I expanded my comment into an answer
Feb
19
revised Total energy of the fluid
added 90 characters in body; added 98 characters in body
Feb
19
answered Total energy of the fluid