pervect's latest activity
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Ppervect replied to the thread Graduate About the definition of Born rigidity.I had to look this up. My source is not the best, but it says the indices in h_ab do run from 0..3. I'm not sure if I actually said...
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Ppervect replied to the thread Graduate About the definition of Born rigidity.The two formal defintions of born rigidity I'm aware of apply to timelike congruence which I will denote as ##u^a##. I believe the...
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Ppervect replied to the thread High School Rotating disc: tidal relativity across surface of disc.I don't understand the reference to "trying to turn into a torus", but I did find references (and also had vague recollections that I...
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Ppervect replied to the thread High School Rotating disc: tidal relativity across surface of disc.Do you have a reference? I was unable to confirm, though I did run into some interesting reading about bar mode instabilities for a...
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Ppervect replied to the thread High School Rotating disc: tidal relativity across surface of disc.To understand the rotating disk in special relativity, I believe you need some background material that is not high school level. The...
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Ppervect replied to the thread Undergrad How many sorts of time are there in physics?.That's a good comment, it might be worth mentioning a list of commonly used coordinate time standards besides cosmological time. The...
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Ppervect posted the thread Undergrad How many sorts of time are there in physics? in Special and General Relativity.Some recent threads inspired me to want to make a list of the different notions of time we need in physics (As I write this, I am...