# All Questions

13 questions with bounties
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126 views
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### SUSY and van der Waerden spinor notation

I am currently trying to read into SUSY and I am running into trouble with the van der Waerden spinor notation for Weyl spinors. I am looking for resources that construct and justify the index ...
108 views
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### Relation between antiparticle and the Dirac conjugate? bar symbol

The Dirac conjugate is defined as $$\bar{\psi} = \psi^{\dagger}\gamma^0$$ where $\psi$ is a spinor (4 dim for spin 1/2) that can describe a mixture (direct sum?) of fermion and anti-fermion states. ...
159 views
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### Young's “double double slit” experiment

The set-up is shown in the image above. Find the intensity on the screen as a function of $y$, and $I_0$, where $I_0$ is the intensity of the central maxima. I recognize that the plane wavefront ...
453 views
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### How does time-translation symmetry morph into evolution in time?

I am reading Ballentine's textbook "Quantum Mechanics: A Modern Development". In it he transitions from discussing time-symmetry to discussing evolution (of the state) in time. I'm finding it ...
38 views
+100

### Primordial color charge fluctuations that failed to die out due to cosmic inflation

We know that ripping the quarks in a hadron apart will not give us free quarks, but rather new (anti-)quarks are generated that neutralize the color charges of the quarks. We also know that the total ...
56 views
+100

### Preventing parasitics for wires?

This is in relation to my question One-way magnetic shielding? where the correct answer gives some links to the material. My question is, does this material, one-way magnetic/electric shielding ...
68 views
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### Intuition behind hydrostatic force/pressure being applied laterally

I can understand how the downward vertical force is being applied: due to the weight of the water column directly above it. However, I cannot understand how the lateral and the upward forces act. How ...
58 views
+100

### Derivation of the refractive index dependency of the light-matter interaction hamiltonian

I tried to derive a relation of the light-matter interaction Hamiltonian in vacuum and a medium that is characterized by a linear real refractive index but I am not sure if the following is correct or ...
68 views
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### Calculating cyclotron orbits in a lattice

I have a naive question, is it possible to obtain the wavepacket dynamics that give rise to cyclotron orbits from a real space tight-binding Hamiltonian? Consider a square lattice in the presence of a ...