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67 votes
5 answers
32k views

What is the connection between Poisson brackets and commutators?

65 votes
12 answers
20k views

What is a tensor?

43 votes
3 answers
9k views

Why isn't the circumferential light around the M87 black hole's event horizon symmetric?

25 votes
4 answers
6k views

Is there a physics Puzzles site like Project Euler?

17 votes
1 answer
3k views

What does a Lagrangian of the form $L=m^2\dot x^4 +U(x)\dot x^2 -W(x)$ represent?

12 votes
2 answers
352 views

Does the fluctuations-dissipation theorem hold in active matter for macroscopic physical quantities?

7 votes
1 answer
933 views

Test whether a glass prevents you from getting your Vitamin D portion?

7 votes
2 answers
1k views

How to calculate the angular momentum states of isotropic quantum harmonic oscillator?

6 votes
1 answer
254 views

How to model RNA-DNA and DNA-DNA binding as a “string matching" problem in statistical physics?

5 votes
2 answers
30k views

How does smoke move in the air and how can one direct it?

4 votes
2 answers
10k views

How the pipes of water don't freeze in -40 celsius?

4 votes
2 answers
383 views

How does particle physics use deep neural networks to find particles?

4 votes
1 answer
2k views

What is the Kitaev Model and why has it become so popular? [closed]

3 votes
1 answer
133 views

How to measure the information loss due to coarse-graining of a physical system into a graphical representation?

3 votes
0 answers
130 views

How to derive the simplest 1D Superpotential Hamiltonian?

3 votes
0 answers
113 views

Canonical transformation of spacetime or under field theory formalism

3 votes
2 answers
689 views

Why doesn't Coleman-Mermin-Wanger theorem contradict phase transitions in systems with 1D reaction coordinate?

3 votes
2 answers
1k views

How to derive the angular momentum operator for 3D harmonic oscillator?

3 votes
4 answers
3k views

Why do cameras have double lenses?

2 votes
4 answers
16k views

What is magnetic conductivity?

2 votes
1 answer
915 views

How to show that an $N$-dimensional SHO's dynamics symmetry is $SU(N)$?

2 votes
1 answer
155 views

Are there ensembles for non-equilibrium cases?

2 votes
1 answer
74 views

How do we know that we measure only the higgs and not 2 or more particles?

1 vote
0 answers
41 views

Is there an equivalency between fluctuation and effective degrees of freedom?

1 vote
1 answer
219 views

Phase separation in physics

1 vote
1 answer
101 views

What do the area laws for mutual information and correlations actually state? [closed]

1 vote
1 answer
456 views

Using perturbation theory to solve classical anharmonic oscillations

1 vote
2 answers
1k views

Does the intensity of dipole radiation fall as $1/r^2$ or $1/r^3$?

1 vote
2 answers
957 views

New infrared laser weapon made by the USA - How does it work? [closed]

1 vote
1 answer
153 views

What is the definition of the Potential of Mean Force (PMF) in physics jargon?