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## Main Question or Discussion Point

...through inertial mass, namely to explain away the sameness of inertial and gravitational mass?

If you assume that only inertial mass is a "real" effect, then gravity would simply become a fictious force arising from inertial mass holding matter back from expanding alongside spacetime during the expansion of the universe.

I know this is already achieved for the most part in relativity but it seems to me that it is never explicitly stated that gravity within a universe expanding at an ACCELERATING rate could be viewed as identical to any other fictious force within a non inertial reference frame.

I don't know Big Bang cosmology even nearly well enough but it seems to me that the origin of the "motivating" force to cause & drive the expansion is largely unaccounted for. It does not seem very logical to imagine two opposing forces, one eventually running out allowing the other to drive the universe towards a "Big Crunch" when you can just imagine a single force, held back by a known phenomenon.

Please excuse my very basic understanding. I'm grateful for any pointers you can give me to satisfy my curiousity about this.

If you assume that only inertial mass is a "real" effect, then gravity would simply become a fictious force arising from inertial mass holding matter back from expanding alongside spacetime during the expansion of the universe.

I know this is already achieved for the most part in relativity but it seems to me that it is never explicitly stated that gravity within a universe expanding at an ACCELERATING rate could be viewed as identical to any other fictious force within a non inertial reference frame.

I don't know Big Bang cosmology even nearly well enough but it seems to me that the origin of the "motivating" force to cause & drive the expansion is largely unaccounted for. It does not seem very logical to imagine two opposing forces, one eventually running out allowing the other to drive the universe towards a "Big Crunch" when you can just imagine a single force, held back by a known phenomenon.

Please excuse my very basic understanding. I'm grateful for any pointers you can give me to satisfy my curiousity about this.