According to wikipedia, static mass increase is predicted by Einstein's General Relativity. In the book 'The Meaning of Relativity' by Einstein, inertia will increase when the object is near a ponderable mass. I don't understand about the derivation of the effect. Can someone explain it further? Is it possible to amplify the effect to generate thrust?
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$\begingroup$ Are we to assume you do not have the book in question? $\endgroup$– Ryan UngerFeb 8, 2015 at 12:04
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$\begingroup$ I do have it, and the derivation is far too long to present in a post here. You're best off getting the book. I found a PDF of it, which seems to be legal. You're looking for Eq. 118 specifically. $\endgroup$– Ryan UngerFeb 8, 2015 at 12:06
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$\begingroup$ Note that Einstein's "usual vector notation" is strikingly nonusual (this book is like 80 years old after all). $\operatorname{grad}=\nabla$, $\operatorname{rot}=\nabla\times$ and $[.,.]=.\times.$ . $\endgroup$– Ryan UngerFeb 8, 2015 at 12:19
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$\begingroup$ I have the pdf. But i don't understand about it. If the mass is higher near a ponderable mass, then the stone will have higher inertia on surface of earth than on the sky. Why can't we use this to generate thrust? Like the Woodward effect? (even though the effect in general relativity may be much smaller) $\endgroup$– tzw101Feb 8, 2015 at 14:45
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$\begingroup$ Is this effect the backreaction of gravitational radiation on a mass? It's true that a mass will lose energy to gravitational radiation when accelerated, but this effect will be vanishingly small unless the mass and acceleration are both large. $\endgroup$– Zo the RelativistFeb 8, 2015 at 15:47
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