exchemist Posted May 4, 2017 Report Share Posted May 4, 2017 (edited) By very definition, a gravitational field is an effect of a gravitational wave; the imprint a body makes on the web of space-time. I claimed that the langrangian points were the effects of gravitational waves, not that they were the gravitational waves themselves.... [snip] ..... the cornucopia of citation should cement that I knew what I was talking about. No, that is completely wrong. Billvon has had a go at explaining this to you, but let me try as well:- Think of the electric field around an electric charge. That is a static field: its values at any point in space do not vary with time. This static electric field transmits no energy. No wave is being propagated from the charge. Now think of a dipole antenna. This has oscillating electric charges and it radiates an oscillating electric field (an oscillating magnetic field also arises at right angles to the electric field, due to the connection between electricity and magnetism, but that doesn't affect the analogy.) We call this an electromagnetic wave. This radiation carries energy away from the antenna. Gravitation is just the same. A body with mass is surrounded by a static gravitational field. No radiation, no energy transmission, no waves. (Thinking about energy makes this obvious: if a wave were being propagated it would carry away energy, so the mass would lose energy over time. Where would this energy come from - what energy source in the body would be thereby depleted? It makes no sense.) If you want to think of it in terms of relativity, the curvature of spacetime is not changing: it has a fixed shape. No waves. Gravitational waves are postulated to occur when there is a movement of mass, creating a sudden alteration in the strength of the gravitational field at some point in space. It is postulated that this change in gravitational field should travel outwards from the source of the disturbance at the speed of light, constituting a "gravitational wave". Edited May 4, 2017 by exchemist Quote Link to comment Share on other sites More sharing options...
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