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Umm... I think we're a bit ahead of you there, tommya300, insofar as we all know about mass distorting space-time, but the OP's question was about the effect of massless particles on space-time.
Also, space-time can be flat in a non-zero gravitational field i.e. not 'vanished', provided that all of the gravitational forces are perfectly balanced.
Finally, I'm afraid that the light paths in that diagram you included aren't quite correct, as they seem to show deviations away from the mass as they enter and then exit the gravity well.
I though this article was correctDoes this info have any creditability? Isn't stanford.edu from Stanford University?
According to General Relativity a geometric theory of gravitation, Mass and Energy curve spacetime in the local vicinity of the mass body. And since mass and energy are convertible both are attractive under the influence of a gravitational field.
Light does interact with light, yor_on. See http://discovermagazine.com/2010/jan-feb/083.
I think it might be a bit of a stretch to infer that this is proof that light interacts with light.
You're right. It's a light-matter interaction, Geezer. It also doesn't have anything to do with general relativity.
Quote from: Geezer on 10/09/2010 06:26:38I think it might be a bit of a stretch to infer that this is proof that light interacts with light.Then take a look at photon-photon pair production. Read this and this.
The optically excited dipoles in one waveguide interact with the evanescent field ofthe other waveguide and generate a force which is dependent on the separation of thewaveguides and the relative phase of optical modes.