# Strings and gravitational time dilation

εllipse
Is there an explanation for gravitational time dilation in string theory? String theorists say their equations can make the same predictions as general relativity, so I would assume string theory predicts gravitational time dilation, but how would that work? If gravity is no longer mediated by curved spacetime, but carried by a particle, why would clocks slow down in strong gravitational fields?

εllipse
I'm surprised there hasn't been a response to this yet. Is there as of yet no solution to this? I would have thought string theorists would have delt with this by now (especially since the popularized texts I've read have had so much information about general relativity, I would assume gravitational time dilation would be hard to overlook), but maybe not. Possibly string theorists would argue that there wouldn't be any gravitational time dilation after all?

Staff Emeritus
Gold Member
Dearly Missed
εllipse said:
Is there an explanation for gravitational time dilation in string theory? String theorists say their equations can make the same predictions as general relativity, so I would assume string theory predicts gravitational time dilation, but how would that work? If gravity is no longer mediated by curved spacetime, but carried by a particle, why would clocks slow down in strong gravitational fields?

If you mean by what mechanism does the string graviton affect the clocks, I think this is the best we can do: the graviton is supposed to couple to matter in accordance with Einstein's field equations, and since they call for time dilation in a gravity well, the absorption of a graviton must do that too, and the more gravitons absorbed (deeper in the well) the more dilation must occur, according to Einstein's formula.

If you think that is just a description without an explanation, welcome to particle physics. :yuck:

εllipse