7,945 reputation
2645
bio website N/A
location Vancouver, Canada
age 29
visits member for 3 years, 11 months
seen Aug 13 at 17:26

Relevant for this page: Experience with Java, C/C++, OpenMP, MPI, Python, Lua Oh, and LaTeX, of course :)

Student of Computer Science and Physics at RWTH Aachen University.


Sep
30
awarded  Explainer
Sep
27
awarded  Pundit
Aug
14
awarded  quantum-mechanics
Jul
9
answered spectral functions
Jul
9
asked Bound states and continua in the spectral function
Jul
2
awarded  Inquisitive
Jul
2
awarded  Curious
Jun
24
awarded  Popular Question
Jun
21
awarded  Good Question
Jun
9
answered Perturbation of an operator - Meaning of matrix element
May
27
comment Why does compressing a piston increase the internal energy?
@Emrakul Yes it does, as are all things in thermodynamics. But since we're dealing with so many particles, all these fluctuations average out.
May
27
answered How to interpret $t^2$?
May
27
reviewed Approve suggested edit on What is an $n$ dimensional space?
May
16
comment Why isn't it $E \approx 27.642 \times mc^2$?
But isn't it then a surprise that this ugly number that we call $c$ is also the speed of light?
May
16
comment Why isn't it $E \approx 27.642 \times mc^2$?
But MKSA wasn't explicitly invented to make $E = mc^2$ a prefactorless equation. It's not like the atomic units theorists use where $\hbar$ and $m_e$ and a bunch of other constants come out to $1$.
May
14
reviewed Approve suggested edit on Where did this equation come from ∠I+ ∠E = ∠A+ ∠D?
May
14
comment Effective Hamiltonian / Perturbation theory for non-degenerate case
Mh, I see. If the entire low-energy subspace is degenerate, then a good approximation is to set $z = E_0$ with $E_0$ the energy of the subspace without the perturbation. That way, you get an effective Hamiltonian that's energy independent. I was hoping for something similar but now with different energy levels in the subspace.
May
14
revised Effective Hamiltonian / Perturbation theory for non-degenerate case
added 253 characters in body
May
14
comment Effective Hamiltonian / Perturbation theory for non-degenerate case
While I appreciate the effort you put in this answer, it's not quite what I was looking for: First, it has to be solved self-consistently and second, I don't see how to generalize it to the case of highly degenerate levels. What I'm looking for is the "non-degenerate" equivalent to how, for example, Heisenberg exchange is derived via 2nd order perturbation theory...
May
13
asked Effective Hamiltonian / Perturbation theory for non-degenerate case