3,634 reputation
923
bio website black-holes.org
location Ithaca, NY
age 35
visits member for 2 years, 5 months
seen Aug 23 at 15:08

I am a theoretical astrophysicist working mostly in relativity.


Aug
15
awarded  Nice Answer
Jun
3
awarded  Enlightened
Jun
3
awarded  Nice Answer
Mar
6
awarded  Yearling
Feb
21
awarded  Nice Answer
Oct
21
awarded  Revival
Aug
30
revised What is the physical significance of the off-diagonal moment of inertia matrix elements?
added 6 characters in body
Jul
24
revised About an Einstein equation
Fixing latex
Jul
23
comment Diffraction and waves
No, because lasers have finite diameters, so they can't be perfect plane waves. (In fact, laser beams aren't really straight and parallel; they are better understood as approximately Gaussian beams.) But, they usually do give a pretty good approximation to plane waves. It can really simplify the analysis to just assume they are plane waves.
Jul
22
revised Diffraction and waves
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Jul
22
revised Diffraction and waves
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Jul
22
answered Diffraction and waves
Jul
17
comment Naturalness, simplicity and SUSY
Interesting. But it seems like $\mathrm{p}(\text{Model's parameters})$ could be very hard to determine without appeal to aesthetics...
Jul
16
revised Why is laser light a cone?
Latex and grammar
Jul
15
comment Why do we feel the passing of time?
Lorentz $\neq$ Lorenz. In particular, Lorentz is the name you want here. We know Lorenz primarily for his gauge condition.
Jul
10
revised Are there old aged particles?
grammar
Jul
8
revised Electric power for current density
Format equation
Jul
8
comment Should linear algebra and vector calculus from traditional courses be replaced with `geometric algebra`?
I really think you need to give some of the pedagogical treatments more of a chance. It can be approached abstractly from pure group theory, or concretely, as we teach dot and cross products. In the concrete approach, it's just as easy as ordinary vector algebra, but it generalizes trivially to arbitrary dimensions and signatures. And in use it shares many features with the tetrad approach to GR, which is computationally very simple.
Jul
7
comment Electric power for current density
You've given us a nicely generalized description of the current, which is the number of electrons (let's say) flowing past a point in a certain direction per second. Now you need to tell us how much energy each one is gaining or losing. That is, you need to tell us the analog of the voltage. And presumably that will just be the energy difference from one point in the conductor to another. So you'll basically get back to $P=IV$.
Jul
7
revised Are Electromagnetic Waves The Only Means of Transmitting Information?
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