zhermes

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I'm a grad-student in Astrophysics, focusing on theory, and generally studying high-energy transients.

	4,289 reputation	bio	website		visits	member for	1 year, 1 month
619 badges		location	Massachusetts		seen	14 hours ago

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May 14	comment	How reliant is the Solar System on being exactly the way it is? @BenCrowell what I'm saying is that there is no reason to require conservation of mass in this situation. Say you have a mass on a spring, with some initial oscillation. Then say half the mass disappears. There's no issue: it's the same as saying you have half the initial mass with some artificial initial displacement and velocity.
May 14	answered	How reliant is the Solar System on being exactly the way it is?
May 14	comment	How reliant is the Solar System on being exactly the way it is? @BenCrowell there is no reason to constrain the problem as such. There is no lack of 'self-consistency', the problem just becomes one of artificial initial conditions---i.e. the current positions and velocities, but the dynamic situation has one fewer body. RhysW's response is exactly correct, if you required a 'rapid acceleration' you might as-well require an explanation for it, or an entire universe where such an explanation would naturally arise.
May 14	comment	Is there a way to see light frequencies invisible to the human eye without the use of electronic sensors? @dmckee how does the frequency doubler work?
May 13	comment	Does the actual curvature of spacetime hold energy? @MoziburUllah over a region which is not necessarily flat, yes
May 13	comment	Does the actual curvature of spacetime hold energy? @MoziburUllah, sorry, the additional criteria is that 'local' refers to a region which resembles flat space-time.
May 13	comment	Our Universe Can't be Looped? If the universe were spatially cyclic ('looped'), would that require curvature, or can one just 'map' the $x\rightarrow +\infty$ side to the $x\rightarrow -\infty$ side?
May 13	comment	Our Universe Can't be Looped? @AlanSE How would looped spacetime violate causality? It seems like this just involves comparisons of measurements
May 13	comment	Does the actual curvature of spacetime hold energy? @MoziburUllah: no, local means a spacetime region - even if it becomes arbitrarily small.
May 13	comment	Photons, where do they come from? Each bullet point should be its own question. Then `2` should probably be closed as duplicate, and `4` as unconstructive.
May 12	comment	How connected thermodynamical stability and dynamical stability for black holes? Why can't you use the standard Hawking Entropy?
May 11	comment	How connected thermodynamical stability and dynamical stability for black holes? In particular, thermo stability requires a maximum of entropy, which in general, I think, is non-additive. What do those facts have to do with eachother? And how do they apply to black-holes? What does this have to do with dynamical stability?
May 11	comment	How connected thermodynamical stability and dynamical stability for black holes? Welcome to Physics.SE! This question is unclear, can you expand on what you are asking and give relevant context?
May 11	reviewed	Approve suggested edit on Why is $r'/r^2 = -1/r$?
May 10	revised	Gas Circulation Using Pressure Difference deleted 18 characters in body
May 10	comment	Is there any phenomenon in physics which is sensitive to irrational numbers? Do you mean imaginary numbers?
May 10	answered	Cosmological triangle with PLANCK results
May 8	revised	I am trying to calculate the branching ration of higgs goes to 2 photons using the standard model edited tags
May 8	comment	I am trying to calculate the branching ration of higgs goes to 2 photons using the standard model ...What's the question?
May 8	comment	If particles can find themselves spontaneously arranged, isn't entropy actually decreasing? @AlecS he doesn't say strictly zero, he says in effect zero.