Sagittarius A-Star's latest activity
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Sagittarius A-Star reacted to sbrothy's post in the thread High School Einstein equations don't work at large scale? with
Like.
Heh. One Schilling. Science was expensive in those days. :smile: -
Sagittarius A-Star replied to the thread High School Einstein equations don't work at large scale?.Here is a source: Source (letter pages 25 and 26, PDF pages 29 and 30)...
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Sagittarius A-Star reacted to Nugatory's post in the thread Undergrad Problem in understanding how upwards acceleration works (General Relativity) with Like.
Goethe (actually not Goethe, that’s a loose paraphrase from an English language translation) has a good point but you’ve misunderstood...
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Sagittarius A-Star replied to the thread Undergrad Problem in understanding how upwards acceleration works (General Relativity).No. Both, plus calculating to solve problems, are needed for successful lerning.
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Sagittarius A-Star reacted to Dale's post in the thread Undergrad Problem in understanding how upwards acceleration works (General Relativity) with Like.
I am glad. I think that I should recommend that you begin studying physics from a good textbook. So far, asking AI and asking us seems...
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Sagittarius A-Star reacted to PeterDonis's post in the thread Graduate Can exact Lorentzian kinematics emerge from Euclidean space? with Like.
This involves analytic continuation of the time coordinate, which the OP rules out, so it's not what's being asked about in this thread...
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Sagittarius A-Star replied to the thread Graduate Can exact Lorentzian kinematics emerge from Euclidean space?.I don't know, but I found something related: https://mathworld.wolfram.com/EuclideanQuantumFieldTheory.html
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Sagittarius A-Star replied to the thread Undergrad Problem in understanding how upwards acceleration works (General Relativity).Yes. To be more precise: For the free-falling observer, a nearby body on the ground has locally a coordinate-acceleration relative to...
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Sagittarius A-Star reacted to PeterDonis's post in the thread Graduate Can exact Lorentzian kinematics emerge from Euclidean space? with Like.
In this case ##t## isn't timelike, so there's no justification for even calling it a "time". But I guess one could view that as yet...
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Sagittarius A-Star replied to the thread Graduate Can exact Lorentzian kinematics emerge from Euclidean space?.Yes. It is the unphysical first case ##K=-1## in posting #2, which is an Euclidean rotation in the ##xt## plane. ##\begin{pmatrix} x'\\...
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Sagittarius A-Star replied to the thread Graduate Can exact Lorentzian kinematics emerge from Euclidean space?.That's true, but I didn't claim that it is the same. With "4D-Euclidean metric" I referred only to the OP.
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Sagittarius A-Star replied to the thread Graduate Can exact Lorentzian kinematics emerge from Euclidean space?.Given the assumptions in the paper "Nothing but Relativity", including group properties of a transformation (two boosts in one direction...
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Sagittarius A-Star reacted to Nugatory's post in the thread High School Why is g = 9.8 and from where/what triggers the upward acceleration? with Like.
There is no such thing as "real acceleration", at least until you provide a definition of this non-standard term. There is proper...
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Sagittarius A-Star replied to the thread High School Why is g = 9.8 and from where/what triggers the upward acceleration?.You can. The following experiment proved, that the surface of Earth has a proper upwards acceleration of ##9.81 \ m/s^2)##...
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Sagittarius A-Star replied to the thread High School Why is g = 9.8 and from where/what triggers the upward acceleration?.The proper acceleration is equal to the (momentary) coordinate-acceleration with reference to a momentarily co-moving inertial...