Thomas

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visits member for 1 year, 3 months
seen Apr 19 '13 at 15:17

Apr
15
comment Does quark color contribute to “spin degeneracy” for QGP calculations?
Yes, and if you have a ``2'' for degrees of freedom of a photon you should put 16=2$\times$8 (polarization times color) for gluons. Also, charm plus strange gives $7/8\times 4\times 2=7$ (fermion corrections factor times Dirac=spin$\times$ particle/anti-particle times flavor).
Apr
10
comment Bell's Theorem graph
You don't need entanglement and Bell's theorem to see that QM contains randomness. Consider a single spin 1/2 particle polarized along the x-direction and measure the component of the spin along z. You (randomly) get $\pm\hbar/2$ with equal probability.
Apr
10
comment Second quantization
In the first line you assume that the Hamiltonian only contains 1-body operators. That is too restrictive. Interesting Hamiltonians, like the one you consider later, contain 2-body, 3-body etc operators.
Feb
16
comment Your favorite Physics/Astrophysics blogs?
What I find disappointing is that on math or computer science blogs you occasionally find serious discussions among knowledgable participants, but this never seems to happen on physics blogs. Not that many serious blog entries, a lot of cranks among commenters, and a lot of name calling.
Feb
16
comment Your favorite Physics/Astrophysics blogs?
In my view by far the most informative (for scientists, not the general public) and carefully written physics blog.
Jan
6
answered What constitutes a 'reliable' instanton calculation?
Dec
29
awarded  Teacher
Dec
29
answered Dispersion of ferromagnetic ($E\propto k^2$) and antiferromagnetic ($E\propto k$) spin wave