32,362 reputation
23693
bio website joshphysics.com
location Los Angeles
age 28
visits member for 2 years, 3 months
seen 1 hour ago

New project: phermi.com

Let me know if you know of any hard physics problems with clever solutions. (email listed to the left)

Personal website: joshphysics.com

Currently a lecturer at the UCLA Department of Physics and Astronomy.

Ph.D. theoretical high energy physics, UCLA.

BA/BS in physics/math, UC Berkeley.


1d
reviewed Edit Why is the harmonic oscillator so important?
1d
revised Why is the harmonic oscillator so important?
few spelling mistakes
Apr
24
revised Trace of an operator matrix (Quantum computation and quantum information)
added 13 characters in body
Apr
23
comment Is Archimedes' principle valid with moving objects?
@ManuelJesus I'm not entirely sure what you mean by "perfect" and "ideal" with respect to the fluid, but there will also be effects from Bernoulli's Principle even if there is no drag but the water is moving around the object.
Apr
22
answered Is Archimedes' principle valid with moving objects?
Apr
11
awarded  Popular Question
Apr
8
comment When to use Hamiltonian vs Lagrangian?
Related: (read all answers) physics.stackexchange.com/questions/89035/…
Apr
5
awarded  Favorite Question
Apr
5
awarded  Good Question
Apr
4
awarded  Popular Question
Apr
2
comment Tensor Operators
Thanks for pointing that out.
Mar
23
awarded  Nice Answer
Mar
18
comment Differential geometry of Lie groups
@WetSavannaAnimalakaRodVance Interesting, thanks for the link.
Mar
16
comment Justifying the notation $\langle x\ |\ \psi\rangle$
possible duplicate of Meaning of inner product $\langle \vec{r} | \psi(t)\rangle $
Mar
15
awarded  Good Answer
Mar
12
revised Information content of the electrostatic Maxwell equations vs Coulomb's Law vs Poisson's Equation
added 72 characters in body
Mar
11
comment Why is the “complete metric space” property of Hilbert spaces needed in quantum mechanics?
Comment on question (v1): Regarding your first question, every inner product space is automatically a metric space because every inner product automatically induces a norm (length) in a natural way: $\|x\| = \sqrt{\langle x,x\rangle}$, and a norm induces a metric in a natural way: $d(x,y) = \|x-y\|$. The second question is more involved, but I think it's answered in the duplicates suggested by Qmechanic.
Mar
8
revised Divergence theorem in complex coordinates
deleted 170 characters in body
Mar
3
comment When can one write $a=v \cdot dv/dx$?
@Martín-BlasPérezPinilla I'm somewhat inclined to agree, although I think the abuse has at least two possibly advantages: (1) it's easier and simpler to write and therefore a bit more readable (2) I think it can benefit one's intuition if one knows what he's doing. Having said this, I completely agree that it's often extremely confusing to students, along with a lot of other physics derivative conventions.
Feb
27
awarded  Nice Answer