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.

 

[Entropia]

jay

Hello Sanjay,

The idea of a connection between the gravitational constant and Planck's constant is a topic of ongoing research in theoretical physics, particularly in the field of string theory. Some theories suggest that the value of G may be determined by the value of h, but this has not been definitively proven yet. It is important to note that string theory is still a developing theory and there is currently no consensus on what value of G it may predict. However, some researchers have proposed that G may have a value of around 10^-39 in Planck units, which is significantly smaller than the currently accepted value of 6.674 x 10^-11 m^3 kg^-1 s^-2. More research and experimentation is needed to fully understand the relationship between G and h in the context of string theory. I recommend consulting recent publications and discussions in the field for further information and updates on this topic.

Best regards,