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Quantum-spin
New post in Quantum-spin
Commutator with Pauli spin matrices and the momentum operator
August 1st, 2020
operators
commutator
quantum-spin
quantum-mechanics
homework-and-exercises
Is the oxygen molecule $O_2$ fermion or boson?
January 10th, 2020
molecules
quantum-spin
spin-statistics
atomic-physics
angular-momentum
Why magnetic field lines and force are not orthogonal with magnets?
April 29th, 2020
quantum-spin
electromagnetism
special-relativity
magnetic-fields
Why does earth spin counter-clockwise?
November 20th, 2021
quantum-spin
rotation
earth
angular-momentum
Why are four-vectors needed in the Dirac equation, when there are 4 linearly independent 2D matrices?
March 10th, 2020
quantum-spin
dirac-equation
quantum-mechanics
relativity
Why is Spin Less Classical than Position?
May 8th, 2020
observables
quantum-spin
quantum-mechanics
Queries about rotational groups $\mathrm{SO}(3)$ and $\mathrm{SU}(2)$ in QM
April 29th, 2020
angular-momentum
quantum-spin
group-theory
representation-theory
quantum-mechanics
In quantum mechanics (QM), can we define a higher-dimensional "spin" angular momentum other than the ordinary 3D one?
June 1st, 2020
mathematical-physics
quantum-mechanics
lie-algebra
quantum-spin
angular-momentum
What is a scalar particle?
November 24th, 2020
quantum-spin
quantum-mechanics
particle-physics
Classical vs. Quantum use of the spin 4-vector
August 1st, 2022
quantum-mechanics
special-relativity
angular-momentum
quantum-spin
Spin commutation relations
May 15th, 2020
quantum-mechanics
angular-momentum
quantum-spin
group-representations
lie-algebra
Photon spin projection to arbitrary axis
August 1st, 2022
quantum-spin
photons
helicity
What are possible ways to construct J-matrices (higher order Pauli matrices)?
August 1st, 2022
spinors
quantum-spin
angular-momentum
How are quantum fields related to representations of the Lorentz group?
July 31st, 2020
field-theory
quantum-spin
group-theory
representation-theory
lorentz-symmetry
Square of the Pauli matrices and the identity matrix
October 1st, 2020
quantum-mechanics
angular-momentum
quantum-spin
hilbert-space
observables
Why is the string theory graviton spin-2?
August 13th, 2022
string-theory
quantum-spin
group-representations
Why do electrons in singly occupied states have parallel spin?
March 15th, 2020
electromagnetism
quantum-spin
quantum-states
What does it really mean that particle has a spin of up/down? And how is spin actually meassured?
June 10th, 2020
quantum-spin
angular-momentum
quantum-mechanics
Does a magnetic field arise from a moving charge or from its spin, or both?
July 25th, 2020
quantum-spin
electromagnetism
quantum-mechanics
Is there any relation between spin and gravity?
August 1st, 2022
quantum-mechanics
general-relativity
gravity
quantum-spin
quantum-gravity
How is angular momentum measured in experiments/in practice?
July 22nd, 2020
quantum-mechanics
quantum-spin
angular-momentum
experimental-physics
What does Addition of Angular Momenta tell us about Group Theory?
August 1st, 2022
quantum-mechanics
quantum-spin
group-theory
lie-algebra
representation-theory
Difference between spin-orbit coupling and $LS$ coupling (Russell-Saunders)
August 1st, 2022
quantum-mechanics
angular-momentum
atomic-physics
quantum-spin
definition
What is the spin rotation operator for spin > 1/2?
December 12th, 2020
quantum-mechanics
angular-momentum
quantum-spin
rotation
Where is spin in the Schroedinger equation of an electron in the hydrogen atom?
August 1st, 2022
quantum-mechanics
schroedinger-equation
electrons
dirac-equation
quantum-spin
What is the difference between a charged rho meson and a charged pion?
August 1st, 2022
particle-physics
quantum-spin
standard-model
mesons
pions
Spin, orbital angular momentum and total angular momentum
August 1st, 2022
quantum-spin
quantum-mechanics
angular-momentum
lie-algebra
noethers-theorem
Does a spin-2 particle really return to its previous state after 180° rotation?
June 3rd, 2021
topology
representation-theory
group-theory
quantum-spin
angular-momentum
Why, in spin sums, we sum over final spin states and average over initial states?
August 1st, 2022
quantum-field-theory
quantum-spin
probability
polarization
scattering-cross-section
How does one show using QED that same/opposite electric charges repel/attract each other, respectively?
August 1st, 2022
coulombs-law
electromagnetism
electrostatics
quantum-spin
quantum-electrodynamics
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