User 0x90

67 votes

5 answers

32k views

What is the connection between Poisson brackets and commutators?

asked Jan 21, 2012 at 0:33

65 votes

12 answers

20k views

What is a tensor?

differential-geometry definition tensor-calculus

asked Jul 14, 2012 at 7:34

43 votes

3 answers

9k views

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

general-relativity black-holes astronomy event-horizon accretion-disk

asked Apr 10, 2019 at 14:17

25 votes

4 answers

6k views

Is there a physics Puzzles site like Project Euler?

soft-question resource-recommendations education

asked Feb 11, 2012 at 11:35

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?

lagrangian-formalism

asked Nov 24, 2011 at 20:17

12 votes

2 answers

352 views

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

statistical-mechanics simulations biophysics non-equilibrium fluctuation-dissipation

asked Aug 6, 2019 at 5:52

7 votes

1 answer

933 views

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

visible-light electromagnetic-radiation home-experiment frequency absorption

asked Mar 19, 2015 at 8:31

7 votes

2 answers

1k views

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

quantum-mechanics homework-and-exercises angular-momentum harmonic-oscillator spherical-harmonics

asked Mar 12, 2017 at 7:37

6 votes

1 answer

254 views

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

statistical-mechanics physical-chemistry biology

asked Feb 7, 2021 at 12:38

5 votes

2 answers

30k views

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

fluid-dynamics flow diffusion gas convection

asked Feb 29, 2012 at 20:18

4 votes

2 answers

10k views

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

water

asked Feb 18, 2012 at 12:56

4 votes

2 answers

383 views

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

particle-physics experimental-physics computational-physics network

asked Sep 23, 2018 at 23:37

4 votes

1 answer

2k views

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

ising-model spin-models

asked Mar 4, 2019 at 0:20

3 votes

1 answer

133 views

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

field-theory renormalization information

asked Sep 23, 2020 at 4:04

3 votes

0 answers

130 views

How to derive the simplest 1D Superpotential Hamiltonian?

quantum-mechanics potential supersymmetry hamiltonian

asked Nov 17, 2017 at 4:00

3 votes

0 answers

113 views

Canonical transformation of spacetime or under field theory formalism

general-relativity coordinate-systems hamiltonian-formalism poisson-brackets adm-formalism

asked Dec 24, 2017 at 4:37

3 votes

2 answers

689 views

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

statistical-mechanics field-theory phase-transition physical-chemistry symmetry-breaking

asked Jul 14, 2018 at 23:58

3 votes

2 answers

1k views

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

quantum-mechanics homework-and-exercises operators harmonic-oscillator

asked Mar 10, 2017 at 18:18

3 votes

4 answers

3k views

Why do cameras have double lenses?

optics lenses camera

asked Jan 31, 2012 at 22:40

2 votes

4 answers

16k views

What is magnetic conductivity?

electromagnetism waveguide

asked Apr 19, 2012 at 9:29

2 votes

1 answer

915 views

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

quantum-mechanics homework-and-exercises symmetry group-theory lie-algebra

asked Mar 10, 2017 at 2:39

2 votes

1 answer

155 views

Are there ensembles for non-equilibrium cases?

classical-mechanics statistical-mechanics statistics non-equilibrium

asked Sep 10, 2017 at 23:17

2 votes

1 answer

74 views

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

particle-physics higgs large-hadron-collider

asked Oct 4, 2017 at 6:28

1 vote

0 answers

41 views

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

thermodynamics degrees-of-freedom non-equilibrium fluctuation-dissipation

asked Aug 4, 2017 at 20:40

1 vote

1 answer

219 views

Phase separation in physics

statistical-mechanics resource-recommendations field-theory computational-physics phase-transition

asked Feb 3, 2019 at 18:54

1 vote

1 answer

101 views

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

quantum-information information

asked Feb 17, 2019 at 0:32

1 vote

1 answer

456 views

Using perturbation theory to solve classical anharmonic oscillations

homework-and-exercises lagrangian-formalism spring perturbation-theory anharmonic-oscillators

asked Oct 20, 2016 at 3:17

1 vote

2 answers

1k views

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

electromagnetic-radiation dipole

asked Mar 8, 2013 at 5:42

1 vote

2 answers

957 views

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

electromagnetic-radiation laser

asked Apr 9, 2013 at 13:40

1 vote

1 answer

153 views

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

thermodynamics statistical-mechanics potential terminology non-equilibrium

asked Apr 12, 2020 at 18:50

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42 Questions

What is the connection between Poisson brackets and commutators?

What is a tensor?

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

Is there a physics Puzzles site like Project Euler?

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

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

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

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

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

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

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

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

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

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

How to derive the simplest 1D Superpotential Hamiltonian?

Canonical transformation of spacetime or under field theory formalism

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

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

Why do cameras have double lenses?

What is magnetic conductivity?

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

Are there ensembles for non-equilibrium cases?

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

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

Phase separation in physics

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

Using perturbation theory to solve classical anharmonic oscillations

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

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

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