Form factors in quantum gravity: Contrasting non-local, ghost-free gravity and Asymptotic Safety

Knorr, B. and Ripken, C. and Saueressig, F. (2022) Form factors in quantum gravity: Contrasting non-local, ghost-free gravity and Asymptotic Safety. Il nuovo cimento C, 45 (2). pp. 1-10. ISSN 1826-9885

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Abstract

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. In this context, we introduce a quantum gravity motivated scalar toy model, which demonstrates that Lorentzian asymptotic safety may be compatible with the causal propagation of gravitons.

Item Type:	Article
Subjects:	500 Scienze naturali e Matematica > 530 Fisica
Depositing User:	Marina Spanti
Date Deposited:	05 May 2022 09:24
Last Modified:	05 May 2022 09:24
URI:	http://eprints.bice.rm.cnr.it/id/eprint/21841

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