The String landscape, black holes and gravity as the weakest force

@article{ArkaniHamed2007TheSL,
  title={The String landscape, black holes and gravity as the weakest force},
  author={Nima Arkani-Hamed and Lubo{\vs} Motl and Alberto Nicolis and Cumrun Vafa},
  journal={Journal of High Energy Physics},
  year={2007},
  volume={2007},
  pages={060-060}
}
We conjecture a general upper bound on the strength of gravity relative to gauge forces in quantum gravity. This implies, in particular, that in a four-dimensional theory with gravity and a U(1) gauge field with gauge coupling g, there is a new ultraviolet scale Λ = gMPl, invisible to the low-energy effective field theorist, which sets a cutoff on the validity of the effective theory. Moreover, there is some light charged particle with mass smaller than or equal to Λ. The bound is motivated by… 
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