ajb Posted March 12, 2010 Share Posted March 12, 2010 General relativity still seems the most accurate theory of describing gravitational phenomena. It has now been tested on very large scales and again has proved itself to be very reliable. The claim is that the latest studies of galactic motions rules out tensor, vector scalar gravity but does not rule out f® theories (which also look better than general relativity from a renormalisation group flow point of view towards quantum gravity). This work takes a significant step forward in using large-scale clustering data to constrain general relativity... says Robert Caldwell. Have a look at the IOP news report here. Link to comment Share on other sites More sharing options...
vuquta Posted March 13, 2010 Share Posted March 13, 2010 Wow!. How exactly does dark matter and dark energy fit into GR? Link to comment Share on other sites More sharing options...
mooeypoo Posted March 13, 2010 Share Posted March 13, 2010 Wow!. How exactly does dark matter and dark energy fit into GR? Well, reading the article: The team also concluded that the existence of vast quantities of invisible dark matter is the best way of explaining the motions of galaxies. The work also suggests that dark energy, in the form of a cosmological constant, is the best way of understanding how the universe is expanding. And also: One ADSD is related to how light from very distant galaxies is distorted by the gravitational fields of other galaxies that it passes on its way to Earth – an effect predicted by general relativity and called gravitational lensing. The second quantity is related to the velocities of the galaxies. The beauty of the new test is that both quantities are susceptible to bias – but the effects cancel in the ratio. Quite interesting, if one just reads through it. Link to comment Share on other sites More sharing options...
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