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It's not trying to explain gravity. It's trying to visualize it.
by bmitc 2y ago
It's not trying to explain gravity. It's trying to visualize it.
- wruza 2y agoI think it’s a good model because it poses the same question: an object is in a field gradient of otherwise forceless space, so what? In 0g a mass on a rubber sheet won’t attract an object, so why would real gravity “lines” attract an object that doesn’t try to move across it? There’s no supergravity for “gravity sheet” to work either. Afaiu, the answer is that moving through time in a gravitational gradient makes you constantly “fall flat” on an x/time 2d graph due to time dilation gradient, thus affecting x and spatial momentum. Apparently mass affects time and time creates gravity. Idk if that’s a fringe idea or mainstream.
- NooneAtAll3 2y agoin 0g, object that does not leave contact with the curved (by-whatever-means) rubber sheet will behave the same way "using gravity" in the experiment is convenience of the experiment - gravity is freely abundant to use, both as a source of curvature and source of "making objects not leave the sheet" if you want to hold the sheet by yourself, and hold the objects to the sheet by yourself - you are free to do it, enjoying your victory of "not using gravity" but the point is not in the means, but in the end - create curvature, keep contact
- wruza 2y agoin 0g, object that does not leave contact with the curved (by-whatever-means) rubber sheet will behave the same way An inert object will sit on it kissing it and never go anywhere. The curvature of a sheet doesn’t matter cause there’s no “down” and no forces. If you push it “in” a little and release, the sheet tension will push it back out but not “to” the well. You may start accelerating the system to create gravity-like situation, but that’s the point.