geordief Posted July 13, 2019 Share Posted July 13, 2019 What does it mean that a source of energy will curve spacetime ? How is the energy measured? Is it relative to a particular frame of reference? Does that mean that 2 different frames of reference will measure the spacetime curvature of an identical region differently? Does "region" have to be understood in spacetime terms? Link to comment Share on other sites More sharing options...
MigL Posted July 13, 2019 Share Posted July 13, 2019 (edited) Inertial mass-energy is common to all frames, as is space-time curvature. I assume you mean whether the kinetic energy gained through motion ( equivalent to relativistic mass ) is responsible for any 'additional' curvature ? Speed, and energy are both frame dependent, so you can always have a frame where there is no speed ( at rest ), and therefore no additional energy. So, no, there is no 'additional' space-time curvature. Edited July 13, 2019 by MigL Link to comment Share on other sites More sharing options...
geordief Posted July 13, 2019 Author Share Posted July 13, 2019 6 hours ago, MigL said: Inertial mass-energy is common to all frames, as is space-time curvature. I assume you mean whether the kinetic energy gained through motion ( equivalent to relativistic mass ) is responsible for any 'additional' curvature ? Yes that is what I was thinking of. A nice simple answer that puts my question to bed. Link to comment Share on other sites More sharing options...
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