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Aug
7
comment Large and small gauge transformations?
@Hunter The identity component $\mathcal{G}_0$ that you gauge away is almost the whole gauge group, it is an infinite dimensional group. The group of large gauge transformation is only $\mathbb{Z}$, it is discrete. Thus I think that you may consider this as a fine tuning of the gauge principle.
Aug
5
revised Large and small gauge transformations?
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Aug
4
revised Large and small gauge transformations?
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Aug
4
answered Large and small gauge transformations?
Jul
18
answered BRST transformation of adjoint spinor
Jul
8
comment Spontaneous symmetry breaking in classical mechanics, quantum mechanics and quantum field theory
@BebopButUnsteady In the buckling problem, only two modes participate (for example the straight and the one period modes). This is the reason that one can simulate the buckling mechanism using rigid elements together with (a finite number of ) springs.
Jul
7
comment Spontaneous symmetry breaking in classical mechanics, quantum mechanics and quantum field theory
@drake I have changed "invariant solutions", to "time invariant solutions". This means that the classical distribution on the phase space does not change in time. This definition avoids the mention of vacuum. Actually, the Klein-Gordon example is appropriate here, because the invariant solution $\phi = 0$ indicates that the Lorentz invariance is not broken, however it is not a "vacuum", since the Hamiltonian is not bounded from below.
Jul
7
revised Spontaneous symmetry breaking in classical mechanics, quantum mechanics and quantum field theory
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Jul
2
awarded  Fanatic
Jul
1
answered Decomposition of Representation Multiplication
Jun
30
comment Spontaneous symmetry breaking in classical mechanics, quantum mechanics and quantum field theory
Of course, I changed the wording to hopefully avoid confusion.
Jun
30
revised Spontaneous symmetry breaking in classical mechanics, quantum mechanics and quantum field theory
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Jun
27
answered Spontaneous symmetry breaking in classical mechanics, quantum mechanics and quantum field theory
Jun
23
revised Rigorous proof of Bohr-Sommerfeld quantization
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Jun
17
revised Stability of rotation of a rectangular prism
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Jun
17
answered Stability of rotation of a rectangular prism
Jun
13
revised What does it mean to renormalize an effective field theory?
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Jun
13
answered What does it mean to renormalize an effective field theory?
Jun
9
comment Classical and quantum anomalies
@drake: There is a great new article (arxiv.org/abs/1305.1955v1) by Michael Stone and Vatsal Dwivedi in which they classically derive the Abelian and non-Abelian chiral anomlies using a single fermion classical model without second quantization, Grasmann variables, the path integral measure etc.
Jun
9
answered Non-associative operators in Physics