Does String Theory Link the Gravitational Constant to Planck's Constant?

[Sanjay87]

Hi,

A few years ago, I heard that string theory suggested a link between the gravitational constant (G) and Planck's constant (h). Is this true? If so, what value of G does string theory predict? Any references would be much appreciated.

Thanks,
San

 

[HallsofIvy]

Since the whole point of string theory is to connect gravity with quantum physics, that would certainly be expected. But one of the problems with string theory is that there are so many "undetermined constants" that you can set them to give pretty much anything you like for both.