New post in Quantum-spin

Commutator with Pauli spin matrices and the momentum operator

August 1st, 2020

Is the oxygen molecule $O_2$ fermion or boson?

January 10th, 2020

Why magnetic field lines and force are not orthogonal with magnets?

April 29th, 2020

Why does earth spin counter-clockwise?

November 20th, 2021

Why are four-vectors needed in the Dirac equation, when there are 4 linearly independent 2D matrices?

March 10th, 2020

Why is Spin Less Classical than Position?

May 8th, 2020

Queries about rotational groups $\mathrm{SO}(3)$ and $\mathrm{SU}(2)$ in QM

April 29th, 2020

In quantum mechanics (QM), can we define a higher-dimensional "spin" angular momentum other than the ordinary 3D one?

June 1st, 2020

What is a scalar particle?

November 24th, 2020

Classical vs. Quantum use of the spin 4-vector

August 1st, 2022

Spin commutation relations

May 15th, 2020

Photon spin projection to arbitrary axis

August 1st, 2022

What are possible ways to construct J-matrices (higher order Pauli matrices)?

August 1st, 2022

How are quantum fields related to representations of the Lorentz group?

July 31st, 2020

Square of the Pauli matrices and the identity matrix

October 1st, 2020

Why is the string theory graviton spin-2?

August 13th, 2022

Why do electrons in singly occupied states have parallel spin?

March 15th, 2020

What does it really mean that particle has a spin of up/down? And how is spin actually meassured?

June 10th, 2020

Does a magnetic field arise from a moving charge or from its spin, or both?

July 25th, 2020

Is there any relation between spin and gravity?

August 1st, 2022

How is angular momentum measured in experiments/in practice?

July 22nd, 2020

What does Addition of Angular Momenta tell us about Group Theory?

August 1st, 2022

Difference between spin-orbit coupling and $LS$ coupling (Russell-Saunders)

August 1st, 2022

What is the spin rotation operator for spin > 1/2?

December 12th, 2020

Where is spin in the Schroedinger equation of an electron in the hydrogen atom?

August 1st, 2022

What is the difference between a charged rho meson and a charged pion?

August 1st, 2022

Spin, orbital angular momentum and total angular momentum

August 1st, 2022

Does a spin-2 particle really return to its previous state after 180° rotation?

June 3rd, 2021

Why, in spin sums, we sum over final spin states and average over initial states?

August 1st, 2022

How does one show using QED that same/opposite electric charges repel/attract each other, respectively?

August 1st, 2022