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462108
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location Princeton, NJ
age 26
visits member for 3 years
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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).

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


Mar
31
comment Ricci tensor of Metric black holes with nils and solv geometries of Horizon
What are "nils and solv geometries"?
Mar
27
comment Is it possible to block light pollution?
It certainly can't help block lights that are more than a few meters from you. Light pollution isn't just "there's glare in my eyes" -- it's "the better part of the atmosphere is glowing."
Mar
27
comment Air nozzle outlet profile efficiency, concave/convex
"Questions about the physical reasoning and analysis that lead to design decisions are on topic." This is very much an example of what should not be closed under the engineering policy.
Mar
27
comment Earth's direction in space
@userLTK There's no prohibition on youtube here. The only problem with it is when a question or actual answer (not just a comment) says "watch this video" and leaves it at that, forcing users to spend 5, 10, 85 minutes watching something to see what could have been summarized in a few paragraphs at most.
Mar
25
comment Where else is there fire?
@mmesser314 Silicates are formed in interstellar space, where there are only a few atoms per cubic centimeter. Oxidation occurs throughout the cosmos; rapid oxidation in a dense atmosphere (i.e. a flame) not so much.
Mar
22
comment Why do we lift our feet when we walk?
Well, the physics is that it's more energy-efficient to walk at most speeds in most terrain, the biophysics is that it's less wear-and-tear-inducing to walk in such circumstances, and the biology is that we didn't evolve adapted to moving on ice sheets. Take your pick which avenue you want. I personally don't think this has to move; just realize physics only has part of the answer, and you may want a bio perspective.
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.