Physics
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Siyuan Ren

Apparently, this user prefers to keep an air of mystery about them.

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26 When is the Hamiltonian of a system not equal to its total energy? Jul 6 '11
26 If you view the Earth from far enough away can you observe its past? Jul 6 '11
22 What is the physical meaning of the affine parameter for null geodesic? Nov 27 '11
18 What is the difference between electric potential, potential difference (PD), voltage and electromotive force (EMF)? Oct 6 '11
15 How to prove that orthochronous Lorentz transformations $O^+(1,3)$ form a group? Sep 14 '12
13 Why does photon have only two possible eigenvalues of helicity? [duplicate] Jun 8 '12
12 Calculating the commutator of Pauli-Lubanski operator and generators of Lorentz group Sep 28 '12
11 How to derive Fermi-Dirac and Bose-Einstein distribution using canonical ensemble? Dec 21 '11
9 Neutron electric dipole moment and $T$ symmetry violation Mar 8 '12
9 What are some ways to (approximately) symbolically diagonalize Hamiltonian operator? Feb 7 '12
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