As I understand it, the mass of an object creates or determines its gravity, and gravity operates by warping space around a massive object, thus causing other objects to orbit them or fall into or toward them.
If this is the case (mass creates gravity, gravity warps space and thus accounts for the influence of gravity over objects), what, then, is the purpose of the graviton particle? It would seem to me unnecessary, given the above explanation, and yet gravitons are thought to exist.
Thanks!