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doetoe
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48 votes
10 answers
9k views

Why are the laws of thermodynamics "supreme among the laws of Nature"?

44 votes
4 answers
19k views

What is a phonon?

38 votes
3 answers
3k views

Why does glass, in spite of being amorphous, often break along very smooth surfaces?

27 votes
2 answers
5k views

What exactly do we see on the famous neutrino image of the sun?

22 votes
2 answers
6k views

Why does my infrared thermometer say the sky is at -2 °C?

20 votes
3 answers
3k views

What is the meaning of the size of a particle in QFT?

14 votes
4 answers
2k views

Why do little chips break off so easily from strong neodymium magnets?

9 votes
2 answers
730 views

Can the equivalence principle be safely used in non-relativistic mechanics?

9 votes
1 answer
2k views

The dual role of (anti-)Hermitian operators in quantum mechanics

8 votes
1 answer
12k views

Why does glass absorb infrared light?

8 votes
1 answer
972 views

What is the idea behind canonical quantization?

8 votes
2 answers
549 views

Does the photon emitted by an electron falling to a lower energy level have a direction?

7 votes
0 answers
249 views

I don't see that general relativity is really needed for GPS to work correctly [duplicate]

7 votes
1 answer
850 views

Mental picture of interactions in QFT

7 votes
1 answer
395 views

Alice in Wonderland and Systems with a Quadratic Potential

7 votes
2 answers
314 views

Does the concept of the photon as a particle exist in QFT in the path integral formalism? Does the concept of a particle exist?

6 votes
1 answer
631 views

Why is Penrose's diagrammatic notation for tensor operations not widely used? [closed]

6 votes
2 answers
330 views

How does photon-photon interaction manifest in QED?

6 votes
3 answers
513 views

Is general relativity only applicable where the curvature is small?

6 votes
2 answers
185 views

How could the precession of Mercury be known so accurately in the 19th century?

6 votes
2 answers
2k views

Lagrangian $L' = L + \frac{df}{dt}$ gives the same equations of motion

5 votes
1 answer
647 views

How can I measure the ability of sunglasses to block UV radiation?

5 votes
5 answers
853 views

Speed of light as a universal speed limit

5 votes
1 answer
1k views

How to count microstates?

5 votes
1 answer
360 views

How to interpret this image of $AdS_5\times S^5$?

5 votes
1 answer
295 views

State, Dynamics and Interpretation in QFT

4 votes
1 answer
104 views

Can indistinguishable microstates evolve into different macroscopic states?

4 votes
1 answer
119 views

Dynamics of the Ising model and its Monte Carlo sampling

4 votes
2 answers
218 views

Why does a short lifetime of a nucleon excitation imply a broad mass distribution?

4 votes
1 answer
382 views

Is a universe without massive particles scale-invariant?