I'm a grad-student in Astrophysics, focusing on theory, and generally studying high-energy transients.
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May
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awarded | Nice Question |
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May
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awarded | Yearling |
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May
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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. |
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May
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answered | How reliant is the Solar System on being exactly the way it is? |
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May
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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. |
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May
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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? |
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May
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Running VisIt from IPython Doing that command yeilds: /Users/lzkelley/Applications/visit/VisIt.app/Contents/Resources/bin/visit: POSIX shell script text executable |
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May
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Running VisIt from IPython @ThomasFenzl Yeah, cli is an option - and I just saw that the python version is 2.6.4, I just added the sys.path to the question above |
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May
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Running VisIt from IPython added 1577 characters in body |
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May
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Running VisIt from IPython @ThomasFenzl visit -cli means run visit using the command line interface, which uses the python interpreter. How do I check startup operations? |
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May
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Running VisIt from IPython @ThomasFenzl, first thanks for working through this with me! I've added the output to the question above |
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May
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Running VisIt from IPython added 5179 characters in body |
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May
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Running VisIt from IPython @ThomasFenzl yes |
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May
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Does the actual curvature of spacetime hold energy? @MoziburUllah over a region which is not necessarily flat, yes |
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May
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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. |
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May
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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? |
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May
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Our Universe Can't be Looped? @AlanSE How would looped spacetime violate causality? It seems like this just involves comparisons of measurements |
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May
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Does the actual curvature of spacetime hold energy? @MoziburUllah: no, local means a spacetime region - even if it becomes arbitrarily small. |
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May
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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.
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May
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Running VisIt from IPython @ThomasFenzl when I start python from those two locations ( /opt/local/bin/python, and /opt/local/Library/Frameworks...) they both say Python 2.7.3 (default, Nov 6 2012, 01:23:28)
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