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doetoe
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51 votes
10 answers
10k views

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

46 votes
4 answers
20k views

What is a phonon?

39 votes
3 answers
4k views

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

27 votes
2 answers
6k views

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

24 votes
3 answers
3k views

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

22 votes
2 answers
7k views

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

15 votes
4 answers
3k views

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

9 votes
2 answers
741 views

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

8 votes
2 answers
399 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?

8 votes
1 answer
14k views

Why does glass absorb infrared light?

8 votes
1 answer
1k views

What is the idea behind canonical quantization?

8 votes
2 answers
582 views

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

8 votes
1 answer
3k views

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

7 votes
0 answers
292 views

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

7 votes
1 answer
1k views

Mental picture of interactions in QFT

7 votes
1 answer
431 views

Alice in Wonderland and Systems with a Quadratic Potential

7 votes
3 answers
729 views

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

6 votes
2 answers
3k views

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

6 votes
3 answers
623 views

Is general relativity only applicable where the curvature is small?

6 votes
2 answers
252 views

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

6 votes
1 answer
2k views

How to count microstates?

6 votes
1 answer
817 views

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

6 votes
2 answers
1k views

How does photon-photon interaction manifest in QED?

5 votes
1 answer
366 views

State, Dynamics and Interpretation in QFT

5 votes
0 answers
771 views

Does any spacetime admit a global foliation in spacelike hypersurfaces?

5 votes
5 answers
885 views

Speed of light as a universal speed limit

4 votes
0 answers
130 views

Do restrictions on quantum mechanical measurement always just work out to avoid contradictions?

4 votes
1 answer
503 views

Is a universe without massive particles scale-invariant?

4 votes
1 answer
625 views

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

4 votes
2 answers
240 views

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