User Noumeno

21 votes

4 answers

2k views

How should we think about Spherical Harmonics?

asked Dec 4, 2020 at 16:35

12 votes

4 answers

1k views

Connection between different kinds of "Lagrangian"

classical-mechanics lagrangian-formalism definition variational-principle constrained-dynamics

asked Mar 21, 2021 at 14:02

9 votes

3 answers

1k views

Critique on tensor notation

general-relativity tensor-calculus notation linear-algebra covariance

asked Jun 19, 2020 at 16:21

8 votes

5 answers

2k views

General Relativity: is Tangent Space Always Flat?

general-relativity spacetime metric-tensor curvature

asked Jul 6, 2020 at 17:56

7 votes

5 answers

265 views

How to generate electric current without a permanent magnet?

electromagnetism magnetic-fields electricity electric-current electromagnetic-induction

asked Jun 7, 2021 at 16:37

6 votes

6 answers

1k views

General Relativity: is there a better way to get spherical coordinates?

special-relativity metric-tensor coordinate-systems

asked Jul 19, 2020 at 19:02

6 votes

8 answers

2k views

Why do we care about the spectrum of the Hamiltonian?

quantum-mechanics energy hamiltonian eigenvalue observables

asked Aug 31, 2020 at 19:16

6 votes

3 answers

516 views

How to properly understand Gaussian Units?

units si-units unit-conversion

asked Dec 8, 2020 at 12:26

5 votes

2 answers

174 views

How to build an intuition regarding QM angular momentum?

quantum-mechanics angular-momentum intuition

asked Dec 29, 2020 at 17:31

5 votes

1 answer

284 views

Can we handle the wave function as if it was a real valued function? [duplicate]

quantum-mechanics wavefunction potential schroedinger-equation complex-numbers

asked Oct 22, 2020 at 17:49

5 votes

3 answers

153 views

Quantum Mechanics: Particle vs Particle Beam

quantum-mechanics

asked May 13, 2021 at 16:45

5 votes

3 answers

553 views

A Big Problem in Landau's Statistical Mechanics Book

statistical-mechanics

asked Mar 3, 2021 at 17:14

5 votes

1 answer

284 views

Strange conservation of energy in Navier-Stokes Equations

fluid-dynamics energy-conservation conservation-laws stars navier-stokes

asked Mar 4, 2021 at 15:14

5 votes

4 answers

208 views

What do I need to build special relativity?

special-relativity speed-of-light inertial-frames

asked Aug 3, 2020 at 13:36

5 votes

4 answers

1k views

General Relativity: Definition of Locally Inertial Frame

general-relativity spacetime acceleration inertial-frames equivalence-principle

asked Jul 8, 2020 at 20:43

4 votes

2 answers

435 views

How to Normalize a Wave Function?

quantum-mechanics homework-and-exercises wavefunction hamiltonian normalization

asked Sep 3, 2020 at 18:08

4 votes

2 answers

302 views

Tensor and Matrices

special-relativity metric-tensor tensor-calculus conventions notation

asked Jul 14, 2020 at 13:06

4 votes

3 answers

290 views

Commutator and Factorization of the Eigenfunctions

quantum-mechanics operators wavefunction hamiltonian commutator

asked Mar 25, 2021 at 11:49

3 votes

2 answers

212 views

How to fully understand the Definition of Entropy?

quantum-mechanics thermodynamics classical-mechanics statistical-mechanics entropy

asked Feb 28, 2021 at 16:14

3 votes

0 answers

411 views

Why the volume of a cell in phase space should be equal to $(2\pi \hbar)^s$?

quantum-mechanics classical-mechanics entropy phase-space

asked Feb 28, 2021 at 22:05

3 votes

2 answers

198 views

How Rising and Lowering Operators directly imply quantization?

quantum-mechanics operators angular-momentum harmonic-oscillator discrete

asked Nov 1, 2020 at 19:03

3 votes

1 answer

182 views

Problem regarding the definition of spinor

quantum-mechanics hilbert-space wavefunction quantum-spin spinors

asked Nov 29, 2020 at 16:27

3 votes

1 answer

245 views

Functions versus Vectors in Quantum Mechanics

quantum-mechanics operators wavefunction vectors quantum-states

asked Aug 31, 2020 at 18:49

3 votes

1 answer

405 views

Geodesics and constraints on the parameterization

general-relativity spacetime differential-geometry metric-tensor geodesics

asked Jul 2, 2020 at 18:31

3 votes

3 answers

823 views

Simple derivation of the Maxwell's equations from the Electromagnetic Tensor

homework-and-exercises electromagnetism special-relativity tensor-calculus maxwell-equations

asked Jun 26, 2020 at 14:51

3 votes

3 answers

193 views

How to properly find the spectrum of the Quantum Harmonic Oscillator? [duplicate]

quantum-mechanics hilbert-space operators harmonic-oscillator eigenvalue

asked Jun 1, 2021 at 20:12

2 votes

1 answer

101 views

States with defined energy and time evolution

quantum-mechanics wavefunction hamiltonian time-evolution

asked Jun 3, 2021 at 16:14

2 votes

1 answer

98 views

Why are Energy Fluctuations approximately equal to $k_BT$?

thermodynamics energy statistical-mechanics temperature

asked Apr 13, 2021 at 16:50

2 votes

1 answer

102 views

Wiener process as the integral of a stochastic force

statistical-mechanics dirac-delta-distributions correlation-functions stochastic-processes brownian-motion

asked Jan 12 at 20:37

2 votes

2 answers

123 views

What does it mean to "quantise" a system?

quantum-mechanics classical-mechanics operators observables quantization

asked Apr 1 at 17:04

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84 Questions

How should we think about Spherical Harmonics?

Connection between different kinds of "Lagrangian"

Critique on tensor notation

General Relativity: is Tangent Space Always Flat?

How to generate electric current without a permanent magnet?

General Relativity: is there a better way to get spherical coordinates?

Why do we care about the spectrum of the Hamiltonian?

How to properly understand Gaussian Units?

How to build an intuition regarding QM angular momentum?

Can we handle the wave function as if it was a real valued function? [duplicate]

Quantum Mechanics: Particle vs Particle Beam

A Big Problem in Landau's Statistical Mechanics Book

Strange conservation of energy in Navier-Stokes Equations

What do I need to build special relativity?

General Relativity: Definition of Locally Inertial Frame

How to Normalize a Wave Function?

Tensor and Matrices

Commutator and Factorization of the Eigenfunctions

How to fully understand the Definition of Entropy?

Why the volume of a cell in phase space should be equal to $(2\pi \hbar)^s$?

How Rising and Lowering Operators directly imply quantization?

Problem regarding the definition of spinor

Functions versus Vectors in Quantum Mechanics

Geodesics and constraints on the parameterization

Simple derivation of the Maxwell's equations from the Electromagnetic Tensor

How to properly find the spectrum of the Quantum Harmonic Oscillator? [duplicate]

States with defined energy and time evolution

Why are Energy Fluctuations approximately equal to $k_BT$?

Wiener process as the integral of a stochastic force

What does it mean to "quantise" a system?