John Dumancic's user avatar
John Dumancic's user avatar
John Dumancic's user avatar
John Dumancic
  • Member for 7 years, 11 months
  • Last seen this week
27 votes
Accepted

Why are snowflakes flat?

10 votes

Why doesn't Gaussian wavepacket broadening in position mean there will be a shortening in momentum?

10 votes
Accepted

In 4 spatial dimensions, would motion under a central force law be confined to a plane?

9 votes

What vector field property means ā€œis the curl of another vector field?ā€

6 votes

Is the Lagrangian density of electromagnetism half-blind?

6 votes

Why is the covariant derivative of a one-form $\nabla_{i}v_j=\frac{\partial v_j}{\partial u^{i}}-\Gamma^k_{~ij}v_k$?

6 votes

Fourier transform notation and Klein-Gordon equation

5 votes
Accepted

What does the uncertainty principle tell us about the harmonic oscillator?

4 votes
Accepted

Do atomic orbitals have a well-defined geometry or concrete spatial dimensions?

4 votes
Accepted

Show that $\nabla ·(\bar\Psi\nabla\Psi - \Psi\nabla\bar\Psi) = \bar\Psi\nabla^2\Psi - \Psi\nabla^2\bar\Psi$

4 votes
Accepted

Confirming $\nabla_\mu T^{\mu\nu} = 0$ for the electromagnetic field tensor in curved spacetime

4 votes
Accepted

Upper limit of neutron star mass and collapse to a black hole

4 votes
Accepted

Curl of an Electrostatic Field

4 votes

3d solutions for 1d Schrödinger equation?

4 votes
Accepted

How does rest energy $E=mc^2$ follow just from special relativity?

4 votes
Accepted

Is general relativity the simplest possible theory of gravitation?

3 votes

Is there a quantum analogue of the "Tennis Racket" theorem?

3 votes
Accepted

How much energy, momentum, and/or angular momentum are lost to radiation in Rutherford scattering?

3 votes
Accepted

How does the uncertainity principle apply in this situation?

3 votes

Are loops counted twice in Feynman diagrams?

3 votes

What carries the electrostatic and magnetostatic forces?

3 votes

Why coupled oscillators tend to seek integer frequency ratios?

3 votes

Geodesic equations of the FRW metric (Christoffel symbols)

3 votes

Equations of motion in curved spacetime

3 votes
Accepted

Off-diagonal elements of the inertia tensor and its eigenvalues

3 votes
Accepted

Is electric field like a dimension of space?

2 votes
Accepted

Constructing the concept of a tensor from simpler, more familiar ideas

2 votes
Accepted

Ricci tensor manipulation of weak field metric in General Relativity

2 votes
Accepted

What is a Past Event Horizon?

2 votes
Accepted

Deriving an equation of motion out of an action