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102. Advice, by Jim Kotsybar

And here comes the congratulation from the Singer of Physics James Kotsybar! Unfortunately, all poets are shy –   he always prefers to interact over email.

However one tries to advise,
The results only antagonize,
Yet the moral that’s missed
Is to never insist
that one’s own ideas are the most wise.

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93. Second order hydrodynamic coefficients in some field theories (like QCD)

By definition, we call an IR mode of a quantum field theory hydrodynamical, if its relaxation time goes to infinity, while its wave length \lambda\to \infty. If this mode is hydrodynamical, does it mean that its evolution is determined by one of the equations we study in hydrodynamics – like, say, Euler equation or Navier-Stokes equation?

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