28,509 reputation
461107
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location Princeton, NJ
age 26
visits member for 3 years
seen 2 hours 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.


Apr
30
comment Is “eco” shower mode actually using less power?
I think this is very much a physics question at heart: can the energy used to heat water vary by using more heat sources at a lower temperature?
Apr
30
comment What is third cosmic velocity?
@JohnRennie I think the OP just means "studying a chapter about <lowercase> gravitation," since "third cosmic velocity" is not an actual term and certainly appears nowhere in MTW. Perhaps it's a literal translation from some other language.
Apr
21
comment Why U235 over U238?
I guess so, but for all I know some grad student somewhere manipulated 30 pages of QFT symbols to show heuristically that this is to be expected. And even if not, the result should be calculable in principle if not in practice.
Apr
17
comment What are the tidal effects of Io on Jupiter?
"But I think the effect is more complicated than that, affecting the isosurface of equipotential" -- honestly, altering the equipotential surface is all tides directly do. On Earth's oceans, the presence of the continents together with the thinness of the ocean hampers the response to this forcing, resulting in complex patterns as detailed here, but I can't see this mattering for Jupiter.
Apr
17
comment Ratio of two RMS values in recorded audio
Questions simply about volumes are certainly physics, though when you start mixing in human perception (dynamic range), this becomes less clear. For similar questions, note there is a sound design beta site that might be more appropriate.
Apr
16
comment Is it possible that Mercury collided with Earth, thus creating the Moon?
@BowlOfRed Well, Mercury is easily tugged by the other planets. For example its orbit is precessing at a good fraction of a degree per century relative to an inertial frame. And it has been proposed that its orbital parameters vary chaotically on very short timescales (for example having no eccentricity some times).
Apr
15
comment Can the event horizon save conservation laws for black holes?
The information paradox is a lot more subtle than often presented. In particular, even if you can account for all the information at the end and the beginning of the process, I think there is an issue in the middle. Most of the Hawking radiation comes out at the end of the black hole's life, when the hole itself is already too small to contain much information. Perhaps someone can fill in the details in this line of thinking.
Apr
14
comment Does air density influence a football player's ability to “bend” the ball?
@wim Yes. I meant 11.
Apr
14
comment Which lamp is brighter, the one through which electrons flow or current
I don't know why this has sparked such a negative response, and I certainly don't understand the cries of homework. There is I think a misunderstanding here, but it is very subtle, revolving around the difference between steady state and transience in a circuit.
Apr
13
comment Expectation value of Commutator of Hermitian operators
@user40330 It is good practice to edit questions that have been placed on hold, in order to make them better. That said, I still don't see what is actually being asked here.
Apr
11
comment Are the Voyager spacecraft rotating in space or are they completely still?
Those are extreme time lapses caught on 1960s-era cameras -- the video quality is what one would expect. And as for engines, you don't get billions of kilometers over the span of decades by constantly running some noisy engine; you simply aim for planets in just the right way and let gravity handle the rest.
Apr
10
comment The actual space curvature
Paradigm shift? I don't know of any credible evidence against homogeneity. Just lots of pet theories looking for zebras (new physics!) among horses (galaxy clusters).
Apr
7
comment Strangeness of QFT
possible duplicate of Photon wave packets from distant stars
Apr
7
comment How do we know that the Law of Cooling is true?
Isn't the simple law often called "cooling in a draft" -- i.e., assuming enough motion so that the ambient medium has essentially infinite thermal conductivity, and the rate limiting step is the object-medium interface?
Apr
6
comment In continuum mechanics, why is the stress vector $T=\sigma\cdot n$ not a covector?
Is there some reason you're calling it the stress vector? I feel the issue of vector vs. covector is a red herring, given the more important issue of vector vs. rank-2 tensor.
Apr
1
comment Would a planet in a binary star system follow Kepler's Laws?
@user6760 All astronomy and astrophysics questions are on topic here, even with the launch of the other site. And there are plenty of astrophysicists here.
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.