Form Factors in Quantum Gravity - contrasting non-local, ghost-free gravity and Asymptotic Safety

Understand

Form factors constitute the key building block when organising the gravitational dynamics in terms of a curvature expansion.

• They generalise the concept of momentum-dependent couplings to curved spacetime.
• Moreover, they may capture modifications of the gravitational interactions at high energy scales in a non-perturbative way.
• We briefly review the role of form factors in various quantum gravity programmes with special emphasis on non-local, ghost-free gravity and asymptotically safe gravity.