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Elf Sternberg
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Date: 2011-12-02 05:20 am (UTC)The General Theory of Relativity says: "Mass out there creates inertia here," amongst a few other things.
I don't know the details (the notation conventions alone for the math in GR is pretty tricky until you grok it), but from what I recall, conservation of energy-momentum and mass(gravity)==mass(inertial)¹ both just fall out of General Relativity. The thing that sticks with me about General Relativity, though, is how it ties inertial-mass (the "
m" in "F=m·a") to the "gravitational charge" version of mass. Newton's First Law turns into a side-effect of the rest of the Universe having mass(gravitational), and therefore exerting a gravitational force on you, when all added up.You see where I'm going with this?
Inertia is a result of the Universe resisting change. ^_^
¹(There is some wiggle-room on how close to equal gravitational-mass and inertial-mass are. But how big that tiny difference is … it's directly related to effects that GR kinda-sorta predicts. General Relatvity has a few, "Well, it might be this … then again, we could also have that-there going on …" areas. Another reason GR is so tricksy.)