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location The South
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visits member for 2 years, 5 months
seen Dec 26 at 6:26

May
4
comment “Periodic Table” of Particles of the Standard Model?
@Geremia The inner circle is the set of particles that interact with gluons (strong force), the middle circle is the set of particles that interact with photons (electromagnetic force), and the outer circle is set of particles that interact with W's and Z's (weak force). We know some of the particles the Higgs interacts with but we're not sure if there are more or not so no circle as of yet.
May
3
comment “Periodic Table” of Particles of the Standard Model?
@Geremia Your table is out of date. It has 17 particles now. upload.wikimedia.org/wikipedia/commons/0/00/…
May
2
comment Why is the Coulomb taken as the unit positve test charge, though $1 C$ charge is a high value?
And note that 1 ampere of current (~ 1 light bulb) is neither an extremely large nor extremely small amount of current. In fact it's a very ordinary amount.
Apr
26
comment Weak interaction and Neutrino
You heard wrong. All known fermions interact through the weak interaction. That includes all leptons and all quarks.
Apr
21
comment Schroedinger equation. Mass. Charge
You could say the same thing about $F=ma$.
Apr
21
comment Gauss' law and an external charge
@user37433 I'm not quite sure what you're asking. What are you trying to do with this cubic Gaussian surface?.
Apr
19
comment Is cosmic background radiation absolute
It most definitely does. See the link in my comment above for more info on microwave radiation.
Apr
19
comment Is cosmic background radiation absolute
Two key words: microwave radiation. Since it is light, it's speed is...? (and no, it's certainly not stationary!)
Apr
19
comment Will it ever be possible to observe the cosmic neutrino background?
The IceCube South Pole Neutrino Observatory already reported the first observations of cosmic neutrinos last Noveember. In fact, it was deemed the biggest breakthrough of 2013.
Apr
18
comment double of temperature
The Celsius temperature scale is a difference scale, not a ratio scale. Try doubling $0^\circ$ C.
Apr
17
comment Why uncertainty principle is not like this?
Because the fundamental equation of quantum mechanics is $[\hat A,\hat B]=i\hbar \hat I$, for conjugate variables $\hat A$ and $\hat B$.
Apr
12
comment De Broglie Wavelengths
See wiki for info on wavenumber and wave vector.
Apr
12
comment About the speed of light
See relativistic rocket.
Apr
11
comment Is there any general position function $x(t)$ that gives the solution to $x''(t) = k/x(t)^2$, where k is a constant?
Try multiplying by x' and integrating
Apr
6
comment Gauss' Law for Magnetism Derivative Form: With or without volume integral?
They're equivalent alright. This is exactly how you go between the integral and differential formulations of Maxwell's laws.
Apr
6
comment Hamiltonian Operator Interpretation of Quantum Anomaly
A quick google search turned up this article: link.springer.com/article/10.1007%2FBF01466595. Sadly, only a preview is freely available, which is a shame since it appears exactly what you're looking for.
Apr
6
answered What prevents an orbiting object from getting a speed which is greater than $c$?
Apr
5
comment Is the Higgs field part of space?
Fields aren't elements that make up space. Rather, they are conditions on space. Think of them as mathematical functions that assign a physical quantity to each point in space and time. For instance, the electric field assigns an electric field vector to each point of space. The Higgs field assigns four component complex scalar from SU(2) to each point of spacetime, instead of assigning a vector to each point. So we call it a Higgs field instead of a vector field.
Mar
30
comment What is Fermi energy and Fermi level?
Please, there's no need to shout.
Mar
30
comment Principal value of 1/x and few questions about complex analysis in Peskin's QFT textbook
Unfortunately, there are two completely unrelated meanings of the term "principal value". The kind referred to here is the Cauchy principal value, which assigns values to otherwise undefined improper integrals. This has nothing to do with the principal value you had in mind, which is for selecting single-valued branches of multi-valued functions. I know, it's stupid. You'd think someone would have fixed all these weird ambiguities by now, but alas math is not French.