15,112 reputation
33563
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location Princeton, NJ
age 24
visits member for 1 year, 9 months
seen 7 hours ago

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


Feb
7
comment Do black holes exert an infinite amount of energy at the event horizon?
All those words, but none answers the question.
Feb
6
comment How can a fly be in the space of a roofless car, get out of the car space and get back in while the car is driving at the speed of 80mph?
This question appears to be off-topic because it is about biology.
Feb
6
comment Do black holes have a characteristic size?
@chase Exactly. The only way you could get meaningful sizes is by limiting yourself to a particular class of black hole.
Feb
6
comment Many world interpretation on test
Generally QM interpretations are just that - philosophical ascriptions of ideas to quantities that appear in the theory. By definition they are not testable, because QM is QM and it makes the same predictions no matter what interpretation you like. What many-worlds formulation do you have in mind that could even be considered testable?
Feb
6
comment How to determine the order of indications of a clock?
Is this a fair restatement of your question: "Given that we can parametrize timelike curves in such a way that time is not monotonically increasing with the parameter, how can we know the physical time-ordering of events given only their parameter-ordering?" If not I have to say I still can't understand what is being asked.
Feb
5
comment Compare Dynamics of Cosmic Ray Neutron Radiation
I'm a bit confused. If station A's signal looks like station B's but lagging by 10 days, that must be a coincidence. The time travel delay between different parts of the planet is measured in milliseconds, not days. Or are you just trying to use one station's peaks as templates for a "generic peak" that can be subtracted elsewhere?
Feb
5
comment Non-Locality of Space - QFT (Srednicki's book)
Possibly a duplicate of physics.stackexchange.com/q/13624 or more directly physics.stackexchange.com/q/18762, but this approaches from a different enough angle that I'm not personally inclined to close.
Feb
5
comment Observed composition of UHE cosmic rays
For the uninitiated, the criterion is set by the fact that once the particle gets too energetic, its Larmor radius is bigger than the region with the magnetic field, and so it will escape with no chance for further acceleration. Thus you need either a very strong a very extended field (or both! but this tends not to exist) to accelerate UHE's.
Feb
4
comment Why does a picture of a person seem to be looking in the same direction irrespective of the angle of observation?
This question appears to be off-topic because it is about perception and artistic technique, not physics.
Feb
4
comment Do two beams of light attract each other in general theory of relativity?
There is nothing wrong with the setup here, but note the paper Stan Liou cites shows that perfectly parallel beams happen to have no attraction.
Feb
3
comment How is dark energy calculated
The standard, concordance $\Lambda$CDM universe is infinite, and so too is its mass (not that one should be defining a global thing like mass in GR anyway, at least not without serious thought as to what it means). Unless I'm misunderstanding, your first, fourth, and fifth equations all read $\infty = \infty$.
Feb
3
comment Are derivative indices summed in indicial notation?
possible duplicate of How should the implicit sum $C_{ijkl}u_{i,j}u_{k,l}$ be interpreted?
Feb
3
comment How come the universe is made of matter and not antimatter?
@WetSavannaAnimal Yes indeed, but alas! he hasn't logged on to the site in the last 3 months.
Feb
3
comment Existence Of Electric Field Lines
Voting to close as irreparably damaged by link rot.
Feb
3
comment Physical plausibility of the Inverted Pyramid puzzle
I think there is a basic physics question here, regarding linear stability analysis in classical mechanics. That said, phrasing the question in the context of the brainteaser is probably the reason for the down/close votes - we have seen all too many "solve my homework" and "this isn't physics but I want to hear what physicists say" questions lately, and so there's a certain knee-jerk reaction to anything vaguely resembling this.
Feb
2
comment Could the Earth have a dark matter core as well as a disk?
@Jitter But dark matter doesn't form a disk (it has a very hard time exchanging angular momentum with anything, including itself), and there is no reason to believe it is clumped up here anyway. That paper has to stretch things extremely far in order to keep it's idea alive, and a number of experiments have already ruled out the parameter space the author wants to work in.
Feb
1
comment Do wormholes have a side to their path through space?
I could imagine this answer depending on what one means mathematically by "wormhole," and it's not like one can point to a "typical" wormhole somewhere in the universe for reference.
Feb
1
comment How to measure distances to stars by means of spectroscopic parallaxes?
Just to be clear, astronomy and astrophysics are decidedly on-topic for this site. Questions about amateur observing techniques might get a better audience on the other site, and this site doesn't do recommendations for what commercial products to purchase, but everything else is fine here.
Jan
31
comment What is the constant $K_1$ in these orbital equations?
@RomanPodolski Indeed, soon enough you should be able to self-answer, and this is encouraged :)
Jan
30
comment Faster than light galaxies/clusters?
Nice! This is the most clear and succinct explanation of the phenomenon I've ever seen.