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Physics, Astronomy & Cosmology / Re: What is the mechanism of gravity?
« on: 06/06/2014 05:09:09 »Quote from: Phractality
The warp of space-time is a mathematical description of the effect of gravity, …I assume by ”warp” that you really mean “curvature”. The term “warp” as defined at
http://www.merriam-webster.com/dictionary/warp
is not a synonym for curvature.
And curved spacetime is not a mathematical description of the effect of gravity. It’s the description of gradients in the gravitational field. It’s what Newton would have called a tidal force. Gravity and tidal forces are not the same. They are merely related to each other. As I explained above you can have a gravitational field with no spacetime curvature. I fact that was the very first gravitational field that Einstein himself considered.
Quote from: Phractality
Space-time is curved because gravity bends the path of light in Euclidean space, and Minkowski redefined "straight line" as the path of light.Actually you have it backwards. Spacetime is not curved merely because gravity bends light. You can bend light in flat spacetime as a matter of fact. You made a serious mistake here. Spacetime is not Euclidean. For a space to be Euclidean it has to use the metric that is used in Euclidean space. Flat spacetime is not Euclidean because the metric is non-Euclidean. Also Minkowski did not redefine ”straight line.” Mathematicians such as Gauss and Riemann came up with the idea of how to generalize the concept of straight line in a curved space by introducing the concept of the geodesic. But the assertion that Minkowski redefined "straight line" as the path of light is quite wrong.
Quote from: Phractality
I believe gravity, ….Why? A belief without a good reason for it is absolutely useless.
Quote from: Phractality
and all the other forces of nature, result from exchange of momentum between regular energy and dark energy.Quite wrong. Absolutely no justification for such an assertion. Nobody knows anything about Dark Energy so making such a claim is wishful thinking, not physics.