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A comment on New class of galaxy has been discovered, made almost entirely of dark matter. Parent comment

Re:New class of galaxy has been discovered, made almost enti... by evanb on Friday August 26, 2016 @09:56PM (#12370523)
That's right. Quantum mechanically, potentials are generated by the exchange of off-shell mediators (the clearest explanation I have seen is in Zee's QFT in a Nutshell).

https://en.wikipedia.org/wiki/On_shell_and_off_shell

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