Visions in Quantum Gravity
Luca Buoninfante, Benjamin Knorr, K. Sravan Kumar, Alessia Platania, Damiano Anselmi, Ivano Basile, N. Emil J. Bjerrum-Bohr, Robert Brandenberger, Mariana Carrillo González, Anne-Christine Davis, Bianca Dittrich, Paolo Di Vecchia, John F. Donoghue, Fay Dowker, Gia Dvali, Astrid Eichhorn, Steven B. Giddings, Alessandra Gnecchi, Giulia Gubitosi, Lavinia Heisenberg, Renata Kallosh, Alexey S. Koshelev, Stefano Liberati, Renate Loll, Leonardo Modesto, Paulo Moniz, Daniele Oriti, Olga Papadoulaki, Jan M. Pawlowski, Roberto Percacci, Lesław Rachwał, Mairi Sakellariadou, Alberto Salvio, Kellogg Stelle, Sumati Surya, Arkady Tseytlin, Neil Turok, Thomas Van Riet, Richard P. Woodard
TL;DR
Visions in Quantum Gravity provides a comprehensive synthesis of the Nordita program, capturing how diverse quantum gravity approaches—from EFT-based QFT and asymptotically safe gravity to discrete spacetime models, loop quantum gravity, and string theory—address core issues of unitarity, locality, and observables. The paper highlights the central role of gravitational EFT as a common ground while exposing tensions with UV-complete frameworks and non-perturbative methods, and it surveys the status of S-matrix observables, holography, and cosmological implications. It emphasizes the need for cross-disciplinary dialogue and the development of testable predictions, including gravitational-wave and cosmological signatures, to connect high-energy theories with observations. Overall, the organizers argue for sustained collaboration across communities to identify universal QG principles and to steer future research toward concrete, falsifiable predictions that can be confronted with data from astrophysical and laboratory probes.
Abstract
To deepen our understanding of Quantum Gravity and its connections with black holes and cosmology, building a common language and exchanging ideas across different approaches is crucial. The Nordita Program "Quantum Gravity: from gravitational effective field theories to ultraviolet complete approaches" created a platform for extensive discussions, aimed at pinpointing both common grounds and sources of disagreements, with the hope of generating ideas and driving progress in the field. This contribution summarizes the twelve topical discussions held during the program and collects individual thoughts of speakers and panelists on the future of the field in light of these discussions.