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location Princeton, NJ
age 25
visits member for 1 year, 11 months
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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).


Jun
22
comment Why is the intensity of Hawking radiation dependent on the size of the black hole it comes from?
Not a direct answer, but your intuition started to go wrong way in the beginning when you implicitly assumed "event horizon" was a local concept. Event horizons have nothing to do with escape velocity, and everything to do with the global causal structure of spacetime. In other words, one cannot look at a small patch of spacetime and conclude it is part of an event horizon. So the horizon in some sense "knows" about the mass of the BH.
Jun
21
comment Why does my gravity simulation do this?
Yes! Leapfrog! +1. I plug this every chance I get. (Of course that fixes problems the OP hasn't encountered yet; force softening is more important here.)
Jun
21
comment Why does my gravity simulation do this?
Unless I'm misremembering, standard Runge-Kutta, as ubiquitous as it is, isn't symplectic. So it's not as unconditionally unstable as forward-Euler, but it's still not very good for long-term N-body simulations.
Jun
20
comment What kind of physics research can a high-schooler get involved in and form new discoveries in?
Usually the hardest thing to learn in research is what questions are worth pursuing - what does the community care about? what is doable? what has already been done? Most researchers learn by some form of apprenticeship - work in a lab, have an adviser, hang out with Doc Brown after school, etc. Asking around at a nearby university can prove fruitful for finding a mentor, but you have to be extra careful you are taught and not just used for cheap labor.
Jun
20
comment Boiling Pasta resulting in a Torus like shape?
Plus I bet the heat is only applied in the very center of the bottom of the pot. A copper pot base or a large, electrically heated stovetop might disrupt the effect.
Jun
20
comment Does the Night Mode of the screen display (LCD) save more energy?
That said, I'm not too sure this is off-topic for us. A general, qualitative question about how devices work (not how to build them, not how to program them, not what studies have been done on them) seems okay.
Jun
20
comment Does the Night Mode of the screen display (LCD) save more energy?
Also Ask Different. (Most of these are LED/LCD/OLED)
Jun
20
comment Does the Night Mode of the screen display (LCD) save more energy?
Related on Skeptics, Electrical Engineering, Superuser 1, 2, and 3.
Jun
19
comment Is the edge of our Hubble Sphere within our Cosmic Event Horizon and why?
Still, one can ask why nothing special happens at the Hubble sphere. In physical coordinates, it seems natural to say that if E and A are moving apart at $c$, a photon cannot compensate. And in comoving coordinates, we all agree that there is a finite distance at which the photon's travel time from E to A is infinite - why is that distance strictly greater than the distance to the Hubble sphere? I'm not saying anything you've written is wrong, but this is a very subtle thing to explain satisfactorily.
Jun
17
comment How does “warp drive” not violate Special Relativity causality constraints?
Generic FTL travel is incompatible with causality. Are you claiming otherwise? Are you claiming Alcubeirre claimed otherwise?
Jun
17
comment Why does cold metal seem colder than cold air?
@JarosławKomar makes a very good point - that's why you can grab aluminum foil right out of the oven and suffer no ill effects, despite it's high conductivity.
Jun
17
comment How does “warp drive” not violate Special Relativity causality constraints?
It unquestionably violates causality, and that's why Harold White is a charlatan. Every cent of NASA money given to his research has been nothing but a way of defrauding US taxpayers.
Jun
16
comment Mathematically possible vs physically probable outcomes
@jbowman Then your stance is wrong. It is an all too common fallacy when multiplying very small numbers (the single-trial chances of these things happening) with very large ones (the number of trials) that people will round the small numbers to zero identically, and then say that 0 times anything is still 0. You were never entitled to round those small numbers to 0 in your intuition, especially now that you're going to multiply them by a number constructed to be larger than they are small.
Jun
16
comment Mathematically possible vs physically probable outcomes
I read the OP's problem as being a version of the common conflation of "random" with "evenly distributed." I'm not sure measure-0 events are the problem, if the OP is willing to accept that slight variations on an extremely unlikely configuration still count as part of that configuration. There are many perfectly specified states of sand on a surface that I would recognize as "spelling out my name," and their combined measure is strictly greater than 0.
Jun
16
comment Why do all elements above $\require{mhchem}\ce{Fe}$ not decay to $\ce{Fe}$?
Ni-62 has the lowest binding energy per nucleon, Fe-56 the lowest mass. I've never really gotten my head around which measurement should matter more, and in fact that's related to an unanswered question on this site.
Jun
15
comment How can the Earth keep spinning with a liquid core?
No amount of sloshing can change the total angular momentum of a closed system.
Jun
15
comment Null State Level 2 in CFT
Without knowing anything about the subject or equations, I still smell a classic induction problem a mile away.
Jun
14
comment Calculate the maximum variation in brightness of a star due to the presence of a planet in orbit
@Zet see if the added explanation helps
Jun
13
comment How does heat actually stay kept in the carbon molecules in the atmosphere?
I'll agree that the car gets energy via light entering the windows. However, it heats up the same way greenhouses actually do, which is to say not the greenhouse effect. It heats up because it is closed off, whereas most things on the surface of the Earth are cooled by convection and wind. Also, that glass is generally not opaque to infrared is evidenced by the fact that your camera has a dedicated IR filter to stop the CCD-activating IR that passes through the lens.
Jun
13
comment In Orbital Mechanics what is the quantity described below called?
Specific angular momentum?