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location Austin, TX
age 34
visits member for 3 years, 11 months
seen 44 mins ago

I am a Ph.D. general relativist working as a software engineer. I like to still go and do physics as a hobby, and to keep up my skill and knowledge.


4h
comment Gravitation Field inside hollow sphere
You're not integrating over the sphere, you're integrating over the charge distribution, which means you're integrating over the shell.
5h
answered Forces on objects orbiting a black hole?
6h
comment Black hole “no hair” theorem
After all, a straight wire with an oscillating current is axisymmetric, but it will also radiate EM radiation.
6h
comment Black hole “no hair” theorem
@RobJeffries: there's more to the no-hair theorem, certainly, because angular momentum muddies the whole thing. There is no strong theorem like this when you relax spherical symmetry to axisymmetry, which you need to do to consider spin.
13h
comment Why are extra dimensions necessary?
@TrevorAlexander: Well, the idea would be that the universe would be shaped like a tiny cylinder or something like that in those directions, so the total volume of the space in those directions would be vanishingly small.
1d
comment No length contraction!
The tape will be moving and will therefore length contract.
1d
answered Black hole “no hair” theorem
1d
comment Why are extra dimensions necessary?
@TrevorAlexander: the idea would be that the extra dimensions would be spatial dimensions, just in directions we can't move in.
1d
comment Drift Speed and Current in Two Different Inertial Frames
Well, you could argue that you get a spin on an electron due to relativity. YOu certainly need relativity to get the relationship between the electron spin and the magnitude of it's magnetic moment correct.
2d
comment Gravity - Force or Result?
@CuriousOne: I have seen a quantum theory of sound -- the phonon theory that they use in solid state. I guess it's possible that gravitational waves and the metric tensor could be something like soliton states in some bigger theory, but I think we can both agree that that is probably not the most likely outcomes.
2d
answered Why does gravity enact force?
2d
answered Density distribution of black hole while cycling energy?
2d
comment Gravity - Force or Result?
@CuriousOne: not everyone thinks that gravtons exist? Who doesn't think that gravitational waves should have quanta in some fundamental theory? There's no known way to couple classical degrees of freedom to quantum degrees of freedom, and the black hole entropy stuff is screaming that there needs to be some sort of quantization of gravity.
Oct
20
comment Why do we believe in a “force” driven universe?
They're likely to be harsher on physicsoverflow, but feel free to give it a try. It's a much slower place over there.
Oct
20
comment Why do we believe in a “force” driven universe?
@AlistairRiddoch: we're not invested in these paradigms, so much as they work, and they explain a ton of unexpected things. In each instance, they're actually simpler than what came before, as you can really easily see formulating electrodynamics with and without special relativity, for instance.
Oct
20
answered Why do we believe in a “force” driven universe?
Oct
20
comment Understanding fields and their correlation to forces
@Key: fundamentally, all magnetic forces are due to the Lorentz force on moving charges. Even ferromagnets have their roots in the spinning of charged electrons.
Oct
16
comment How much energy does a photon need to form a black hole?
@CountIblis: LQG quantizes area at the planck scale, so I would assume that you lose Lorentz invariance at similar length scales.
Oct
16
comment How much energy does a photon need to form a black hole?
@21joanna12: there is no answer in LQG yet. The theory, as it currently exists, is a theory of gravity alone. There is no matter content in it, and thus, no concept of "a photon" in a full, quantum sense.
Oct
16
answered How much energy does a photon need to form a black hole?