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doublefelix
  • Member for 7 years, 6 months
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  • New York, Munich
27 votes
1 answer
2k views

How does QFT predict the probability density to find a particle at x?

16 votes
4 answers
2k views

Could we make things out of newly discovered particles?

15 votes
2 answers
1k views

Are basis vectors imaginary in special relativity?

14 votes
2 answers
623 views

Can the coefficient of friction be derived from fundamentals?

13 votes
4 answers
2k views

Inconsistency with partial derivatives as basis vectors?

11 votes
3 answers
5k views

How did Rutherford's gold foil disprove the plum pudding model?

6 votes
8 answers
2k views

Could dark energy just be particles with negative mass?

6 votes
1 answer
169 views

Do potentials make sense in relativistic quantum theory?

5 votes
1 answer
274 views

How was the double slit experiment predicted in theory? [closed]

5 votes
1 answer
295 views

Solved Gauss' Law for $\vec{E}$ without boundary conditions?

4 votes
1 answer
210 views

Bell's Theorem - Why does $\lambda$ have a probability?

4 votes
5 answers
1k views

How do we know that time dilation applies to objects other than light?

4 votes
2 answers
1k views

Where does the electric force come from if an electron has no definite location?

4 votes
3 answers
437 views

Does a photon attract or repel matter?

3 votes
0 answers
71 views

Why do forces have to be mediated by bosons? (Or do they?) [duplicate]

3 votes
3 answers
2k views

Derivation of Inverse Lorentz Transformation in Index Notation

3 votes
3 answers
473 views

Fields in QFT: What are the Initial Conditions, $\phi(t=0,x)$?

2 votes
0 answers
57 views

What does the identity operator look like in QFT, written in momentum eigenstates? [duplicate]

2 votes
2 answers
567 views

What is the importance of a diagonal density matrix after measurement/decoherence?

2 votes
0 answers
156 views

How to compute partial trace of $U ( \rho_A \otimes \rho_B) U^+$? [duplicate]

2 votes
2 answers
69 views

When does the wave function spread over the volume of a box?

2 votes
1 answer
437 views

Why can't a Weyl Fermion have mass?

1 vote
0 answers
37 views

Is there an entangled ground state solution to the hydrogen atom? (spin neglected)

1 vote
1 answer
336 views

$(\psi_L^\dagger \psi_R)^\dagger \neq (\psi_R^\dagger \psi_L)^\dagger$ ? What is the transpose for spinors?

1 vote
2 answers
186 views

Is $\phi^\dagger \phi (\phi + \phi^\dagger)$ a possible interaction for scalar fields in QFT?

1 vote
0 answers
51 views

Physically, why don't we care about representations that differ only by a similarity transformation?

1 vote
2 answers
140 views

Why define $D_\mu = \partial_\mu -ieA_\mu$ with the electric charge $e$?

1 vote
2 answers
2k views

Why are there two different SI units of magnetic charge?

1 vote
2 answers
140 views

Time Dilation Back to Original Frame is Inconsistent?

0 votes
1 answer
2k views

What is the deBroglie Wavelength in a region with potential energy?