All Questions
153
questions
1
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0
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52
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Colour Factor in QCD Pair Annihilation
My question occurred when I was reading Introduction to Elementary Particles by David J. Griffiths. In chapter 8, part 8.5, he is calculating the colour factor of quark-antiquark annihilation.
My ...
- 81
0
votes
0
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75
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Problem with Bohr Frequency in Quantized Radiation - Matter interaction
Consider an Hydrogenic Atom (no relativistic corrections and no reduced-mass effects) in a Quantized Electromagnetic Pulse given by the wave-packet:
$$
\underline{\hat{A}}(\underline{\hat{r}}, t) = \...
- 402
-1
votes
2
answers
124
views
Could polaroid filters with somewhat strange properties violate Bell's inequality without non-locality?
Imagine a world where polaroid filters have somewhat strange properties, in such a way that this is impossible or very hard to know. The inhabitants use polaroid filters to determine what polarization ...
- 15
-1
votes
1
answer
50
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Electron Interference when produced by $W$ boson
Hi I was wondering about the following setup. Let’s say we have a radioactive atom which decays via beta decay which produces a $W$ boson. The $W$ boson has a chance of turning into an electron or a ...
- 133
1
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0
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71
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What is intrinsic parity? Why is negative intrinsic parity possible?
What is intrinsic parity? It seems that it is a concept only for relativistic quantum physics. Why is it not relevant for non-relativistic quantum mechanics?
- 1,045
2
votes
0
answers
66
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Why don't virtual electrons get generated near protons to form atoms?
If forming an atom is a more stable state for both the electron and the proton, why don't virtual electrons get generated near protons so that they combine with them to form atoms, and then release ...
- 185
-3
votes
1
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86
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Why do the subatomic particles like electron exhibits Dual-nature? And how does the particle knows when to change their state? [duplicate]
As we all know, Subatomic particles show dual-nature when observed but why? why does this happen? also I am genuinely confused as to how does the particle know when to change its nature, I mean i know ...
0
votes
2
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112
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Are particles and waves limits of quantum fields?
In quantum field theory we often hear that particles sometimes behave like waves and sometimes behave like particles.
In quantum field theory we say particles are fundamentally fields.
Is it correct ...
- 525
1
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1
answer
128
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Why are the field operator eigenstates a complete basis of the Fock space? How to properly define the measure $\mathcal{D}\Phi(x)$?
This is a question which has plagued me for a long time.
In the path Integral, we insert$\int\mathcal{D}\Phi(x)\vert\Phi\rangle\langle\Phi\vert=\mathcal{I}$ and $\int\mathcal{D}\Pi(x)\vert\Pi\rangle\...
- 619
1
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0
answers
61
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How should we imbed massive spin-3 in a Lorentz covariant tensor? (degree of freedom-wise)
I'm not asking for Weinberg's systematic approach. Rather, I'm more concerned with how to get the correct degrees of freedom(dof) slickly for the moment.
I believe it should be imbedded in the rank 3 ...
- 619
-4
votes
1
answer
60
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Are black holes diplanar? Is there an inside and an outside? or two sides with separate qualities? [closed]
I’ve seen other posts throughout stackexchange that say a black hole may exhibit having a universe within/across it’s event horizon. does this make a black hole diplanar? or if not, is there a better ...
1
vote
2
answers
85
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Does an excitation of any quantum field extend forever through space?
For visualization purposes, let’s say I slam my hand into sheet metal and it vibrates. Will that vibration extend beyond the metal sheet into the space surrounding it, and would that energy wave ...
1
vote
0
answers
88
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Is there any uncertainty of the magnetic moment of muons?
Charged elementary particles with non zero spins like electrons and muons are observed to carry magnetic moment. This can be modeled using a charged rotating disk. If the distributions of mass and ...
- 1,455
2
votes
2
answers
297
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What exactly is the difference between a quasiparticle and composite particle in QFT/particle physics?
I'm specifically thinking about quasiphotons as the superposition of photons and other interacting particles when light is traveling through a medium. I've been told there's a fundamental difference ...
- 2,327
8
votes
2
answers
2k
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Why can't we observe a fraction of a particle?
I have a train of thought which leads me to believe that we should be able to observe a fraction of a particle. Pelase help me:
In Quantum Field Theory, we model particles as total energy eigenstates ...
- 6,355