- Why do we suppose QG exists
I've read that free fall is the natural state of an object, and that gravity is not a force. Although it is equivalent to acceleration. So objects in space move through curved spacetime. Mass curves spacetime, curvature tells matter how to move. Matter as we know it has mass on the order 0.03 eV upwards to the top. Dimensionally, on the order 10 EE-15 cm. So where is the need to describe the force of gravity at distances less than the Planck length?