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Jan
27
comment Backyard experiments to falsify the Flat Earth theory
Well, physics can be extremely precise nowadays!
Jan
27
comment Backyard experiments to falsify the Flat Earth theory
With a vector ${\bf A}$ and an infinitesimal area $df^{\kappa\xi}$, one finds $\oint \delta A_\nu=-\frac{1}{2}R^\mu_{\nu\kappa\xi}A_\mu\,df^{\kappa\xi}$. Here, $\delta {\bf A}$ is the parallel transport and $R^\mu_{\nu\kappa\xi}$ the curvature tensor. Taking the "wrong" curvature tensor can give you a different result than the experiment!
Jan
27
answered Backyard experiments to falsify the Flat Earth theory
Dec
18
revised When do phase space functions' Poisson brackets inherit the Lie algebra structure of a symmetry?
corrected spelling, typos
Dec
18
suggested approved edit on When do phase space functions' Poisson brackets inherit the Lie algebra structure of a symmetry?
Dec
10
awarded  Critic
Jul
6
awarded  Excavator
Jul
6
revised A missing factor of 2 in the standard Hartree-Fock mean field?
improved formating
Jul
6
suggested approved edit on A missing factor of 2 in the standard Hartree-Fock mean field?
Jun
9
answered What is a d + id superconductor and why does it break time reversal symmetry?
May
13
asked commutation relation of angular momentum operator in non cartesian coordinates
Oct
10
comment How to understand the unitary?
@Roger209: I meant mark as answer.
Oct
10
comment Why particle number operator $\hat{N}$ is $\hat{a}^\dagger\hat{a}$ rather than $\hat{a}\hat{a}^\dagger$?
@LePtC: This would only "shift" your problem...
Oct
10
comment How to understand the unitary?
@Roger209: Please, be so kind and mark the answer if it helped you.
Oct
10
awarded  Yearling
Oct
10
revised How to understand the unitary?
added 35 characters in body
Oct
10
answered How to understand the unitary?
Oct
10
answered Why particle number operator $\hat{N}$ is $\hat{a}^\dagger\hat{a}$ rather than $\hat{a}\hat{a}^\dagger$?
Jan
20
awarded  Editor
Jan
20
revised Noether Theorem and Energy conservation in classical mechanics
typo corrected