Sagittarius A-Star's latest activity
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Sagittarius A-Star reacted to ohwilleke's post in the thread A Is the constancy of c a postulate or a derivable theorem? with
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Good to know. I hadn't been aware of that. -
Sagittarius A-Star replied to the thread A Is the constancy of c a postulate or a derivable theorem?.That's not completely correct. Before Einstein, when the physically relevant coordinate transformation was thought to be the GT...
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Sagittarius A-Star replied to the thread A Is the constancy of c a postulate or a derivable theorem?.Yes. A disadvantage of LET is, that it's "absolute time" is not generally equal to what a clock measures.
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Sagittarius A-Star replied to the thread A Is the constancy of c a postulate or a derivable theorem?.Yes. Morin calls it "Relativity without c". Source (see chapter 11.10 on page XI-38)...
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Sagittarius A-Star replied to the thread A Is the constancy of c a postulate or a derivable theorem?.You can do this i.e. by demanding, that a velocity composition in the same direction is commutative plus a few other assumptions, as...
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Sagittarius A-Star reacted to Greg Bernhardt's post in the thread Announcement Please welcome berkeman as PF Admin with Like.
I am thrilled and honored to announce that @berkeman has accepted a role as PF Admin! @berkeman has 20 impactful years at PF under his...
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Sagittarius A-Star reacted to south's post in the thread B Relativistic contraction factor with Like.
OP immediately wanted to delete the post when he noticed the error and couldn't find the delete option.
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Sagittarius A-Star replied to the thread I Freefall and gravity.The principle of equivalence applies. The object is locally at rest with reference to an upward accelerated frame. This situation is...
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Sagittarius A-Star replied to the thread B Time dilation for two clocks at different altitudes on Earth.This is wrong. It is a common misconception. You have such "gravitational" time-dilation also between bow and stern of an accelerating...
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Sagittarius A-Star reacted to PeterDonis's post in the thread B Time dilation for two clocks at different altitudes on Earth with Like.
Can you give a specific reference?
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Sagittarius A-Star reacted to A.T.'s post in the thread B Time dilation for two clocks at different altitudes on Earth with Like.
My point was that, unlike with kinetic time dilation and no second meeting, here there is no ambiguity which stationary clock runs...
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Sagittarius A-Star reacted to Trysse's post in the thread B Relativistic contraction factor with Like.
Right. Didn't pay attention
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Sagittarius A-Star reacted to Ibix's post in the thread B Relativistic contraction factor with Like.
Yeah, but OP didn't say ##c\pm v## in this thread, he said ##c## and ##v##. He did say ##c\pm v## in another thread...
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Sagittarius A-Star reacted to south's post in the thread B Relativistic contraction factor with Like.
Thank you very much. Best regards.