And with this do you think to have proved that a photon (which has an energy E) warps spacetime?

Since I've just spent an inordinate amout of time in another thread where all I did was to post proofs and you to claim they weren't correct. Homey don't play that game no more.

This time around please just state whether it will or won't and what it means to warp spacetime and what that has to do with the subject at hand.

It has to do with the subject because it was AndroidNeox to write that "Light has no rest mass, but it has momentum. Momentum is what generates gravity", and he was answering me about photons.

Then I *might* respond. Then answer me this. If a pulse of light could generate a gravitational field could a photon?

Do you still believe a photon is a "corpuscle localized in spacetime"? It's something very different.

The reason I ask is because there is no well accepted theory of quantum gravity, hence the reason I never bothered to learn any of it. Since a photon is a quantum particle one needs quantum gravity to properly answer it.

At last you have written it. But not that I hade any doubt you knew it, it's only that you don't seem aware of how people could get confused, because they so easily make the association "photon = corpuscle".

Instead let's talk about a pulse of light of energy E and momentum p and thus has a proper mass of zero.

Tell me lightarrow - Does it generate a gravitational field? If yes, then why. If no, then why not?

If that energy were continuously present, as in the case of a continuous light beam, I know it generates gravity, but in the case of a pulse, I actually don't know.

I'm tempted to say yes, because when the pulse crosses a specific volume of space, the energy and momentum temporarily present inside that region should do it:

[tex]G_{\mu\nu}[/tex]= 8[tex]\pi[/tex][tex]T_{\mu\nu}[/tex] and in the tensor [tex]T_{\mu\nu}[/tex] there are terms which refers to energy, momentum, ecc:

http://en.wikipedia.org/wiki/Stress%E2%80%93energy_tensorBut actually I don't know.