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Apr
18
comment Why do we exclude the quark condensate in the OPE?
the chiral condensate violates chiral symmetry, and there are some correlators where only $m\langle\bar{q}q\rangle$ appears. The latter is also RG invariant.
Apr
18
answered Is even the perturbative expansion of the QCD beta function expected to be divergent?
Apr
18
answered Why do we exclude the quark condensate in the OPE?
Apr
6
answered Physical reason why Prandtl number is order unity for gases?
Apr
1
answered Mean free path in QFT
Mar
31
comment Phase transition in mean field theory Ising model
Tc is not universal.
Mar
29
answered Are the properties assigned to quarks meaningful?
Mar
29
comment Itô or Stratonovich calculus: which one is more relevant from the point of view of physics?
By the way: In physical systems the noise and the drag are not independent. This is the content of fluctuation-dissipation (FD) relations. Physicists like Stra bettter, because FD relations take on a more transparent form, but its not obvious to me what is wring with Ito.
Mar
29
comment Itô or Stratonovich calculus: which one is more relevant from the point of view of physics?
I am not sure that I completely understand. In the limit that I turn of the multiplicative noise, $b\to 0$ in my notation, Ito and Stratonovich processes are the same. For additive noise, they are the same anyway.
Mar
28
answered Wilson Loop in AdS/CFT
Mar
27
answered How to deal with boundary conditions for path integrals?
Mar
27
answered Itô or Stratonovich calculus: which one is more relevant from the point of view of physics?
Mar
21
comment Does an instanton couple equally to all flavors?
It couples equally to all massless flavors.
Mar
18
comment Why are sound waves adiabatic?
Actually, I just noticed that there is something wrong with your equation (it violates the second law). Should be $(\nabla T)^2$. What I meant is: You write ".. make the rhs negligible to the left ..", but this does not make sense, there is an = sign. What you mean is that the lhs (=rhs) is small compared to $\rho T s/T_P$, where $T_P$ is the period.
Mar
18
comment Why are sound waves adiabatic?
Veru good: Two minor comments. 1) Last sentence. Obviously the lhs is equal to the rhs, What you mean is that the time averaged value of $ds/dt$ is small compared to $\omega s$. 2) For standard sound waves large $\kappa$ does not make them isothermal, it makes them strongly damped. There are some cases where you can achieve large heat transport without dissipation, for example radiative transport in space plasmas.
Mar
18
answered Why are sound waves adiabatic?
Mar
17
answered Supercurrent dynamics
Mar
12
answered Current Status of the Monte Carlo Sign Problem
Mar
10
comment Why don't neutrons cluster on their own?
Yes (but to first approximation they are). Also note that $10^{57}$ neutrons would form a bound state. This state is not the ground state, and about $10^{55}$ neutrons would decay into $pe\nu$.
Mar
10
revised Why don't neutrons cluster on their own?
added 191 characters in body