2021/11/24 by Benjamin Knorr, Knorr, Benjamin, Chris Ripken +3
Physics and Astronomy · #Noncommutative and Quantum Gravity Theories #Black Holes and Theoretical Physics #Cosmology and Gravitation Theories
paper · pdf · doi:10.48550/arxiv.2111.12365
Form factors constitute the key building block when organising the\ngravitational dynamics in terms of a curvature expansion. They generalise the\nconcept of momentum-dependent couplings to curved spacetime. Moreover, they may\ncapture modifications of the gravitational interactions at high energy scales\nin a non-perturbative way. We briefly review the role of form factors in\nvarious quantum gravity programmes with special emphasis on non-local,\nghost-free gravity and asymptotically safe gravity. In this context, we\nintroduce a quantum gravity motivated scalar toy model, which demonstrates that\nLorentzian asymptotic safety may be compatible with the causal propagation of\ngravitons.\n