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seen Feb 23 '13 at 14:16

Apr
9
awarded  Yearling
Apr
9
awarded  Yearling
Feb
21
awarded  Enthusiast
Feb
19
comment Is that true that real quantum chaos doesn't exist?
Quantum chaos is the study of the quantum behavior of classically chaotic systems. It addresses the question of what are the signatures of classical chaos in the spectra and wave functions of quantum systems
Feb
19
answered What symmetries does a lattice calculation need to preserve?
Feb
8
comment Cascade in relativistic turbulence
This is completely wrong. Relativistic fluid dynamics is well understood, and applied extensively to a wide range of phenomena. This includes astrophysics (supernova explosions, jets, disks, etc) and relativistic heavy ion collisions. We now know that the formalism developed in Landau and Weinberg can also be derived from the AdS/CFT correspondence. To the best of my knowledge, there is no fundamental difference between rel and non-rel turbulence, in particular the energy cascade is the same.
Jan
3
comment If the ground states of interacting QFTs are so complicated, how did Nature find them?
The main algorithm we have for find the ground state of an interacting QFT is Euclidean lattice field theory. Simulations indicate that ground state of QCD is complex, but not hard to find (in the sense that simple Metropolis algorithms converge quickly, even if initialized with very poor guesses of the ground state).
Jan
3
comment If the ground states of interacting QFTs are so complicated, how did Nature find them?
One minor comment: For realistic values of the quark masses the phase transition is a smooth crossover.
Dec
27
awarded  Commentator
Dec
27
comment Path integral with zero energy modes
You would first have to include chiral fermions and a coupling to gauge fields.
Dec
26
comment Path integral with zero energy modes
The $\omega$ are discrete Matsubara frequencies. In the case of fermions these can never be zero. For bosons, zero modes can indeed appear. This is related to Bose condensation. You can have anomalies in non-relativistic systems with a Fermi surface, but that's a more complicated story, see for example arxive:1203.2697.
Nov
29
answered What is a bulk phase transition?
Nov
4
answered Feynman diagrams and Hartree-Fock
Oct
16
revised Derivation of Ohm's Law
added 20 characters in body
Oct
16
revised Derivation of Ohm's Law
added 163 characters in body
Oct
16
answered Derivation of Ohm's Law
Oct
4
answered Weak isospin confinement?
Sep
24
comment Why water is not superfluid?
A rough criterion is the condition for Bose condensation in an ideal gas, $n\lambda^3\sim 1$, where $n$ is the density and $\lambda$ is the thermal wave length. Note that your question is in some sense backwards: Helium is the exception, water is the rule. Most ordinary fluids solidify instead of becoming superfluid at low $T$.
Sep
24
answered Why water is not superfluid?
Sep
17
awarded  Editor