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location Princeton, NJ
age 24
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I am a graduate student studying astrophysics at Princeton. I received my bachelor's in physics and mathematics from Caltech (2011).


Mar
20
comment Mass exchange between stars
The related Roche limit wiki has some formulas the OP might find useful too.
Mar
19
awarded  Enlightened
Mar
19
comment What's the $\ell$ in the Bicep2 paper mean?
Oops - I was using formulas from my other answer, one of which was wrong, the other of which was misleading.
Mar
19
revised What's the $\ell$ in the Bicep2 paper mean?
fixed error in scale estimate
Mar
19
revised Relation between multipole moment and angular scale of CMB
fixed error in equation
Mar
19
awarded  Nice Answer
Mar
19
comment What do the line segments on the BICEP2 B-mode polarization map mean?
@annav That makes a lot of sense. On the other hand, the OP's source was the first image here, where the caption claims colors are derived from spiraling, not temperature. I'm inclined to believe the caption you found is more accurate, but it's hard to tell, since temperature and polarization will be correlated to some degree.
Mar
19
comment Could an attachment to cell-phones limit or neutralize electro-magnetic radiation?
Yep - I figure as long as the spacing is < ~1 ft. it will be a good Faraday cage for ~1 GHz signals, so it seems reasonable. Anecdotally, my phone never worked well indoors in California, even when reception was great outside.
Mar
19
comment What do the line segments on the BICEP2 B-mode polarization map mean?
@EmilioPisanty Yeah, I admit I didn't look up their exact coloring scheme - I just figured they'd do something similar to what I would have done.
Mar
19
revised What do the line segments on the BICEP2 B-mode polarization map mean?
retracted assumption about coloring scheme
Mar
19
answered What's the $\ell$ in the Bicep2 paper mean?
Mar
19
answered Could an attachment to cell-phones limit or neutralize electro-magnetic radiation?
Mar
18
reviewed Leave Open Light formed by the sun?
Mar
18
reviewed Close Does light color change when refracting?
Mar
18
reviewed Close Expectation value of energy from the position state of hydrogen atom
Mar
18
reviewed Leave Open Quantum Hall Effect Dark Matter Detector?
Mar
18
comment If the universe didn't expand faster than light, would our nights brighter like day?
There is a hint of a well-defined question here, but you have to ignore red herrings. The speed of light has nothing to do with Olbers, or with horizons, or with really anything at all when it comes to the expansion of the universe. The crux of Olbers is the finite age of the universe. Moreover, cosmological redshift changes the energy of light, but it does not change whether or not your line of sight terminates on the surface of a star, so it is irrelevant here.
Mar
17
comment What do the line segments on the BICEP2 B-mode polarization map mean?
I added a bit more to address that. The color map looks like it was defined to be the magnitude of the "z"-component of the curl of the field shown.
Mar
17
revised What do the line segments on the BICEP2 B-mode polarization map mean?
added more information
Mar
17
answered What do the line segments on the BICEP2 B-mode polarization map mean?