.Scott's latest activity
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.Scott posted the thread B Rutgers finds a transparent Einstein Cross - apparently a dark matter "halo". in Cosmology.The formal paper is here. The Rutgers University news has published a story about an image being closely examined at their New...
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.Scott replied to the thread I Linear generator prototype.With an oscilloscope set to the mV range and to trigger on any dV, rapidly swiping the N or S pole across the outside of (but close to)...
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.Scott replied to the thread I Linear generator prototype.Use a voltmeter (with an open circuit).
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Wikipedia: In the abstract interpretation, a pseudosphere of radius ##R## is a surface with constant Gaussian curvature...
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"The sting", that's my favorite movie. The soundtrack is amazing.
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.Scott replied to the thread Resists for etching Aluminium with NaOH.I am not a chemist, but if it was my project I would try a paint intended for high pH surfaces (such as masonry). Such a coating might...
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.Scott replied to the thread I Describing the Big Bang.OK. So, it's NOT a saddle surface that you were talking about. That's what I originally suspected when I said this:
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.Scott replied to the thread I Describing the Big Bang.This quote (above) is where I got the "constant negative curvature". I can't say that you misused the term, because it is what it is...
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.Scott replied to the thread I Describing the Big Bang."Constant Negative Curvature"? Saddle shapes surfaces have negative curvature at all points - and are commonly described as having...
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.Scott replied to the thread I Describing the Big Bang.I think you are referring to 3D "surfaces" that have no 2D equivalents - especially when they are allowed to fold into a four and fifth...
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.Scott replied to the thread RIP Robert Redford (89).Less that a week ago, I caught him playing a handsome Death on the Twilight Zone episode "Nothing in the Dark".
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.Scott replied to the thread I Describing the Big Bang.Been there, done that.
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.Scott replied to the thread I Describing the Big Bang.Or, if the universe really is topologically flat (or otherwise spatially infinite): ##f(x,y,z,t) = \frac{-1}{t^2}## for ##t \ne 0##.
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The NG article is not worth reading. According to Introduction to Modern Cosmology by Liddle: The Big Bang model is reliable back to...
