26,200 reputation
45799
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location Princeton, NJ
age 25
visits member for 2 years, 9 months
seen 8 mins ago

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

My primary interest is in general relativistic magnetohydrodynamics simulations of black hole accretion.


Mar
17
comment What does it mean for a state to have a negative partial decay width?
Can you add a reference to where that table comes from?
Mar
17
comment Why is propagation of uncertainties quadratic rather than linear?
Alas questions like this are becoming more common. Someone out there keeps teaching students the wrong formulas.
Mar
16
comment What was the amount of energy released in the 9/11 terrorist attacks?
The shorter version: to zeroth order, all atomic bonds have the same energy (a few eV), and all combustibles (especially all hydrocarbons) have the same number of bond rearrangements per unit mass. Destruction is caused by power not energy.
Mar
16
comment Negative pressure, tension, and energy conditions
Is there anything wrong with taking negative pressure in a direction to be when the momentum flux along that direction has the opposite sign from the signed area orthogonal to that direction? (I guess this is a verbose way of saying "tension.") That is, define pressure as the spatial trace of the stress-energy tensor, as I did here and you yourself did here.
Mar
15
comment Is electromagnetic vector field a sum of E and B?
But in CGS they have the same unit, where certainly $E^2$ is added to $B^2$ all the time. Even in SI you can just preface one or the other with enough $\mu$'s and $\epsilon$'s to make the units work.
Mar
15
comment Space is expanding so what is time doing?
This seems to be an unpopular answer, but I besides brevity I'm not sure there's anything wrong with it. It highlights the fact that having time itself change over time... doesn't even make sense.
Mar
14
comment If I bend a rod, will its moment of inertia change?
@Sean I think Floris is using the in-screen vertical axis. Of course, the question is rather unclear on this point.
Mar
13
comment Immortality within the multiple worlds interpretation of quantum mechanics
Similar things have been considered, but I strongly suggest not trying the experiment yourself.
Mar
13
comment Effective aperture of an isotropic antenna; question on polarisation
While this could have been asked in a comment, I don't think it's necessarily bad to ask as a standalone question.
Mar
12
comment Kerr metric Christoffel symbols
Schwarzschild is easy; Kerr less so. Even changing the metric in Mathematica, one would need to manually specify substitutions in order for it to return anything remotely reasonable (i.e. not expanding the traditional $\Delta$ and $\rho^2$ abbreviations).
Mar
12
comment Is gravity instantaneous?
possible duplicate of Time taken for gravity of a distant object to interact with a newly created particle?
Mar
12
comment What is the mass of a sphere?
The relativistic mass does increase, and I don't think this is a relativistic mass vs. rest mass confusion. It's more subtle, having to do with the difference between stationary and static mass distributions.
Mar
12
comment Where can I find actual data for the hysteresis of a magnetic material?
I think looking up physically relevant parameters is an important part of physics. Even better, this is asking where to look up parameters, which amounts to asking for a tool that can be used for all sorts of physics.
Mar
12
comment What spacelike, timelike and lightlike really mean?
I might add to the last sentence something like "without bouncing off a mirror" since timelike separated events can also be connected by a piecewise null path. Either that or just define lightlike as the boundary case between timelike and spacelike.
Mar
4
comment Why doesn't $ds^2 = 0$ imply two distinct points $p$ and $p'$ on a manifold are the same point?
@Void You're quite right. I just forgot the square root.
Mar
3
comment The Frequency of a Trill
This might be more appropriate for music.stackexchange.com. In particular, as a physicist who doesn't play string instruments, I don't really know if trilling alters the pitch/timbre of the note (it generally will if and only if the period of the trill is shorter than about the duration of the attack, when the vibrations are reaching steady state). It's also a pure question of music, not physics, as to what trills should sound like.
Mar
2
comment Relation between Vector space $V$ and its dual $V^{*}$
The relevant cross-post: math.stackexchange.com/q/1172022 I know a user there told you you should post here, but cross-posting is generally discouraged, especially if you're well on your way to an answer on the other site.
Mar
2
comment Variation of infinite grid of ideal one-ohm resistors: what would be the equivalent resistance between 2 points in a 3D lattice?
Yes, the formulas hold for any points (one taken to be the origin). The knight's move case is $(l_1,l_2,l_3) = (0,1,2)$ in any order.
Mar
2
comment Difference between Gunn Peterson trough and the Lyman Alpha Forest? Cosmological implications?
Don't worry -- IGM and HI are standard enough terms in astronomy that anyone in the field would know them :)
Mar
1
comment Why is space (almost) flat? Is it because masses are approximately homogeneously distributed?
possible duplicate of Difference between horizon and flatness problems & how inflation solves flatness (w/out math)