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seen Feb 17 at 10:12

Feb
7
accepted Example of application of creation/annihilation operators in matrix form
Feb
6
comment Example of application of creation/annihilation operators in matrix form
you are right! I'm sorry for this
Feb
6
asked Example of application of creation/annihilation operators in matrix form
Oct
30
answered Formal demonstration that minimizing the free energy equals maximizing the entropy
Sep
2
comment Relation between statistical mechanics and quantum field theory
So in order to understand statistical mechanics I don't need any deep understanding in QFT (a basic course of many body should be fine). What about conformal field theory? Is it necessary? en.wikipedia.org/wiki/Conformal_field_theory
Aug
29
asked Relation between statistical mechanics and quantum field theory
Jul
10
awarded  Supporter
Jul
8
answered is there any difference between these Differential $dx^2$ and $(dx)^2$?
Jul
7
comment Friction at zero temperature?
Sorry, what you say is true also because on average over time the surface is flat.
Jul
7
answered Friction at zero temperature?
Jun
20
revised Analogy between magnetic bottle and Van Allen's radiation belt
edited tags
Jun
18
awarded  Scholar
Jun
18
accepted Equivalent system in Centre manifold theory
Jun
18
comment Analogy between magnetic bottle and Van Allen's radiation belt
I had in mind something like this and now i have a clearer view. Thanks! In the van allen's case i think that a revolutionary motion by charged particles around the earth is also possible since the particle can have a velocity tangent to surfaces of equal magnetic field (like the one that appear at the end of the video, tangent horizontally youtube.com/watch?v=6CpNOu4l1dM) see also point 3 in this website phy6.org/Education/wtrap1.html
Jun
17
asked Analogy between magnetic bottle and Van Allen's radiation belt
May
14
revised Qualitative argument to determine energy of defects
added 2 characters in body
May
14
revised Qualitative argument to determine energy of defects
added 257 characters in body
May
14
asked Qualitative argument to determine energy of defects
Apr
27
comment Equivalent system in Centre manifold theory
I think you gave an elegant explanation. I thought about it and i would ask you if my reworking of your answer is fine. Look at eq. 5.55 page 176 Kutztnetsov. It's just an example of diagonalization in case of Hopf's bifurcation. Since we are looking for a tangent plane his dimensionality is lower than the one of the initial system. So when i taylor expand near the origin, chosen as the critical point, y=0 and it disappears from the taylor expansion. So what remains is a function of the other variables.
Apr
10
comment Equivalent system in Centre manifold theory
what do you mean by "marginal directions" ?