Relativity Insights: FAQs on Photons, Gravity, Time Dilation, and More!

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The FAQ entries on relativity topics are being migrated to the Insights blog, enhancing accessibility to key discussions on photons, gravity, and time dilation. Key questions include the nature of photons, the propagation speed of gravity, and the implications of time dilation. The updated FAQ list will address common queries and clarify concepts such as mass-energy equivalence and the Lorentz transformation. Users are encouraged to suggest future FAQs to ensure comprehensive coverage of relativity topics. The migration aims to streamline access to valuable information while maintaining the relevance of older discussions.
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* FAQ entries are slowly being migrated to the Insights blog
https://www.physicsforums.com/insights/category/faqs/

Feel free to request future FAQs
 
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Time to update this page. Too many of the links end up at the black hole -- but the threads/insights are still sitting elsewhere on PF.
 
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There must be lots of old posts which link to FAQ pages that no longer exist. Is it technically possible to redirect these to the correct new location? Or, if not, can at least the old FAQ pages still exist each displaying a link to the new page?
 
DrGreg said:
Is it technically possible to redirect these to the correct new location?
Yep!
 
The relativity FAQ list is back, updated and will be updated as more relativity Insights are posted.
 

Thread 'EPR revisited'

In an inertial frame of reference (IFR), there are two fixed points, A and B, which share an entangled state $$ \frac{1}{\sqrt{2}}(|0>_A|1>_B+|1>_A|0>_B) $$ At point A, a measurement is made. The state then collapses to $$ |a>_A|b>_B, \{a,b\}=\{0,1\} $$ We assume that A has the state ##|a>_A## and B has ##|b>_B## simultaneously, i.e., when their synchronized clocks both read time T However, in other inertial frames, due to the relativity of simultaneity, the moment when B has ##|b>_B##...
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