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May
30
answered Can symmetry be restored in high energy scattering?
May
30
answered Conversion from natural units to SI
May
30
comment Can every particle be regarded as being a combination of Black holes and White holes?
Except for colorful objects that also include red holes, green holes, blue holes. Huh!? There aren't any white holes in the Universe because they're the time-reversed histories to black holes that would violate the second law of thermodynamics. Each microstate one could call a "white hole microstate" is actually a black hole microstate. And black holes only deserve to be called in this way if they're large enough - heavier than the Planck mass and compact objects. Normal objects in the Universe are composed of elementary particles which are much lighter and they're not (usefully) black holes.
May
29
awarded  Enlightened
May
29
awarded  Nice Answer
May
29
comment Is every QFT non-local in the U.V.?
Dear toot, if a theory is nonrenormalizable, then it doesn't exist as a theory at very short distances. In fact, it doesn't exist at any distances shorter than the cutoff distance - which is usually of the same order as the characteristic length scales in this theory. ... I didn't say it has to be asymptotically free; it must be a fixed point but the fixed point may be interacting, not necessarily free. Yes, it should be conformal, that's what "fixed point" means, and the vanishing of all beta functions follows from the conformality.
May
29
answered Is every QFT non-local in the U.V.?
May
29
answered Is quantum entanglement an objective or subjective property?
May
29
answered Origin of the Higgs field
May
29
comment Will photon's energy be exactly same after million years?
BTW in the future, the linear size of the Universe will double each 10 billion years or so. So 1 million years is 1/10,000 of it, so the photon's energy (and frequency) will drop by about 0.01% (red shift). That's relatively small as a human percentage but it's huge if we want to detect it by spectroscopy - frequencies may be measured even with more than 10 significant figures of precision.
May
29
revised Cyclist's electrical tingling under power lines
added 130 characters in body
May
29
comment Is there a tb meson?
I think that the production of the top quark and even bottom quark is so violent - requires so much energy - and the quarks decay to lighter ones so quickly that it's unlikely that you produce two such heavy quarks, moreover with low enough relative velocity that they will be able to form a meson before they decay. So I would guess that the bound state doesn't exist in any useful sense. The non-existence of the related "toponium" (top-antitop bound state) is explicitly stated, for the same reason I mentioned, at en.wikipedia.org/wiki/Toponium
May
29
answered Is there an intuitive explanation for why Lorentz force is perpendicular to a particle's velocity and the magnetic field?
May
29
comment Reference for the ${\cal N}=3$ Chern-Simons Lagrangian at general $N_c$, $N_f$
There are surely macros in Mathematica that do similar algebras but I am not really familiar with them. From similar packages, I have at least heard about FeynRules, see feynrules.irmp.ucl.ac.be - However, how to decompose $W^2$ or $\Phi e^V \Phi$ is about a one-time learning what's going on. And what remains laborious really is laborious but you need it to get the coefficients. The general form of the terms generated are all the terms from non-SUSY theories at the right order with the right symmetries...
May
29
comment Reference for the ${\cal N}=3$ Chern-Simons Lagrangian at general $N_c$, $N_f$
Dear user, I wasn't taught USp anywhere at school either - not even from "textbooks" of advanced topics such as string theory - and it's too bad because it's needed. Sometimes... I am not sure whether there is any preexisting literature on N=3. It's a very special topic. The people who work on it usually check the N=2 symmetry i.e. 4 supercharges equivalent to N=1 d=4 (guaranteed by superspace etc.) and then they impose one more SUSY. The algebra is completely regular, as expected from extended SUSY, with the SO(3) R-symmetry added.
May
28
awarded  Scholar
May
28
accepted Cyclist's electrical tingling under power lines
May
28
comment Cyclist's electrical tingling under power lines
Oh, I see, so it's really about a finite charge in a "capacitor" that limits how much I can get out of it... Thanks. I will actually vote your answer as the "real answer to my question" although there have obviously been many other, sometimes even relevant ideas here...
May
28
comment Cyclist's electrical tingling under power lines
Excellent, you got a +1 already for your first sentence, a very useful first step... Can a millimeter air gap be replaced by a centimeter of slightly wet shorts? Or is the air gap needed literally, i.e. in between body hair? I am still not getting why 700 V is safe. Why is it unsafe to touch 230 V or 120 V power outlets then?
May
27
awarded  Nice Question