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Salmorejo
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52 votes
2 answers
29k views

Why do I see better under water using swimming goggles? [duplicate]

33 votes
6 answers
6k views

Why are Killing fields relevant in physics?

11 votes
1 answer
566 views

Why is the spectrum of old stellar populations characterized by broad lines?

6 votes
3 answers
888 views

Why is the Ricci tensor defined as $R^\mu _{\nu \mu \sigma}$?

6 votes
2 answers
2k views

What are good references for learning about Biophysics at graduate level?

4 votes
1 answer
6k views

How can I prove that D'Alembert operator is invariant under Lorentz transformations?

4 votes
2 answers
38k views

Why is it easier to get sunburnt in the water? [duplicate]

3 votes
0 answers
85 views

Transition rate in systems without thermal noise

3 votes
1 answer
285 views

Why is $|\Lambda^0_0| \ge 1$ for a Lorentz transformation?

2 votes
3 answers
2k views

What is the physical meaning of the Levi-Civita connection?

2 votes
1 answer
78 views

Why does a system whose equations of movement are $\lambda^2U^{\alpha} + \partial_{\mu}F^{\mu \alpha} = 0$ have three degrees of freedom?

2 votes
1 answer
36 views

How is the energy spectrum of a gamma ray in a material?

2 votes
1 answer
475 views

What is exactly the "progenitor bias"?

1 vote
1 answer
40 views

What parameters could be considered to measure the coiling of a ring?

1 vote
1 answer
2k views

Relation between the 3D and the 2D coefficients of diffusion

1 vote
1 answer
916 views

Why is not the D'Alembert operator a scalar?

1 vote
1 answer
427 views

How can I prove that for a Killing vector $\nabla^a \nabla_a \xi^\mu = -R^b_a \xi^a$? [closed]

1 vote
3 answers
472 views

Is there any physical interpretation for $\nabla\cdot(\nabla \times F)=0$?

1 vote
1 answer
1k views

What does it mean that the Rutherford's cross section is infinite?

1 vote
1 answer
266 views

Why do $\psi_a$ and $\bar{\psi}_{\dot{\alpha}}$ represent two different degrees of freedom?

1 vote
1 answer
3k views

How can I prove that the axial gauge is a valid Gauge fixing condition?

1 vote
1 answer
372 views

How can I calculate the period of a photon in a gravitational field?

1 vote
0 answers
96 views

What is the physical meaning of the Killing vectors associated to this metric?

0 votes
2 answers
144 views

Why is the intensity of an alpha ray constant along a material?

0 votes
1 answer
42 views

What is the meaning of the magnitudes on the axes of this spectrum?

0 votes
1 answer
72 views

What is the physical meaning of $\alpha$ in this disintegration problem?

0 votes
0 answers
56 views

Expression for the energy in the limit case of weak gravitational field

0 votes
1 answer
377 views

How can I prove that the covariant acceleration is normal to the velocity?