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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.


Jul
15
comment Recommendations for good Newtonian mechanics and kinematics books
The book was written by Caltech profs, but when I was there a few years ago David Goodstein himself taught physics from a different book entirely. Still this book is probably better than the one they replaced it with.
Jul
14
comment Do I need a particle to simulate a particle?
There is the vaguely-formulated but quite reasonable-sounding hypothesis that nature is the most efficient computer of its own state. I'm having trouble finding references though.
Jul
14
comment Why do the waters of the different oceans of the world have different ratios of their H and O isotopes?
Not that this is off-topic here, but questions like this are also a good fit for Earth Science.
Jul
13
comment If the ionosphere reflects radio waves then why use satellites?
Here's a homework assignment for you: Try to receive a radio broadcast from as far away as you can. Try this at different times of day. You'll find that (1) the signal quality is usually pretty bad after bouncing off the ionosphere, and (2) the furthest signal you can get will often simply not be there (since the ionosphere changes with the time of day).
Jul
13
comment How does a tightrope walker return to equilibrium?
You may be interested to know this question has been asked in many other forms, from ice skaters to astronauts to falling cats.
Jul
9
comment Negative sign in rotation operator again
I feel if anything the first question should be marked a duplicate of this more thorough one.
Jul
6
comment Numerical integration of divergent functions
This belongs on either math or sci comp.
Jul
5
comment Water well fluid dynamics
This is not a hygiene question. The question is if seepage into a well from 100+ feet deep can explain well water that goes up to 15 feet deep, or if the observed high water levels indicate there must be a leak higher up. It is very much physics.
Jul
5
comment How can laser interferomerty be used to measure path difference smaller than wavelength of laser light?
Have you ever seen the fringes from an interferometer? There's nothing stopping you from measuring a fraction of a fringe...
Jul
3
comment What happens to sound at speeds greater than mach 1?
I'm really confused by the close votes here. The sound is reversed, and the OP seems to understand this better than most users on this site.
Jul
3
comment Difference between Enzo & Gadget astronomy simulation codes
Ah that too. To be honest, I don't use either code (being an Athena dev myself), so I'm just going off a quick glance at their webpages.
Jul
3
comment Circle becomes Sphere in 3d?
In particular, that scene in the movie was all about how we normally draw wormholes as circles, since we suppress one dimension for convenience when using 2D paper. The circle $\to$ sphere conversion is just undoing that simplification. If we understood some other 3D $\to$ 2D process at work, we would undo it in some other way.
Jul
1
comment Book suggestion for introductory plasma physics
Note there are (at least) two main branches of plasma physics books these days: astrophysical plasmas and fusion plasmas. You kind of have to decide which application you want the theory grounded in.
Jul
1
comment Cosmological Bulk Viscosity - is the universe a fluid?
Protip: Just about anything on arxiv posted to gr-qc and cross-posted to astro-ph is pseudoscience. (Yes, this offends lots of people employed as "scientists." No, I will not back down on this claim.)
Jun
30
comment What are these arcs in bubble chamber photos?
To be clear, are you referring to the single most prominent arc in each picture?
Jun
30
comment How can I measure the ability of sunglasses to block UV radiation?
When you do find a method, be sure to test regular glasses too. (Both glass and plastic are generally rather opaque to UV, even without special treatment.)
Jun
26
comment How many human cells will get affected at the prick of a pin?
I'm voting to close this question as off-topic because this is about biology not physics.
Jun
24
comment How to measure the wavelength of a laser pointer?
If it was at all reasonably priced and you can tell what color it is (green vs. red etc.), then you can figure it out based on what wavelengths are available for sale. Only certain wavelengths are easy to manufacture.
Jun
23
comment How to derive the Schwarzschild radius?
I would actually argue that the event horizon is defined by the surface such that one can never escape from within to infinity. As it turns out, this matches the coordinate singularity in question, but it didn't have to. For example, the polar axis $\theta = 0,\pi$ is also a coordinate singularity in Schwarzschild coordinates, but it has nothing to do with the horizon.
Jun
20
comment Where do Maxwell's equations come from?
Related: physics.stackexchange.com/q/65335