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Physics
Special and General Relativity
Gravitoelectromagnetism: Why Equation Differs in Sources
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[QUOTE="olgerm, post: 6632217, member: 559892"] In article "A note on the gravitoelectromagnetic analogy" by Matteo Luca Ruggiero ([URL]https://arxiv.org/pdf/2111.09008v1.pdf[/URL]) equation number 18 is ##\nabla \dot\ E=4 \pi G \rho## , but corresponding equation in the wikipediapage([URL]https://en.wikipedia.org/wiki/Gravitoelectromagnetism#Equations[/URL]) is ##\nabla \dot\ E_g=-4 \pi G \rho_g## . ##E## notes same thing in the article as ##E_g## on the wikipedia page. ##\rho## note same thing in the article as ##\rho_g## on the Wikipedia page. Why is this equation different in these sources? To me seems that Wikipedia equation is correct, because from it follows that direction of gravitational field is directed [B]to[/B] (not [B]away from[/B]) bodies(with positive mass). [/QUOTE]
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Physics
Special and General Relativity
Gravitoelectromagnetism: Why Equation Differs in Sources
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