The role of gravity in string theory from "summary" of The Elegant Universe: Superstrings, Hidden Dimensions, and the Quest for the Ultimate Theory by Brian Greene
The concept of gravity in the context of string theory is a fundamental component of the theory itself. In the framework of string theory, gravity is not viewed as a force that acts at a distance, as in Newtonian physics, but rather as a manifestation of the geometry of space-time. This means that the presence of matter and energy in the universe warps the fabric of space-time, causing objects to move in curved paths. The key idea in string theory is that particles are not point-like objects but rather tiny, vibrating strings. These strings can be open or closed, and their different vibrations correspond to different particles. One of the consequences of this view is that gravity is also mediated by these strings. In other words, gravity is not a separate force but emerges from the interactions of these string...
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