Positivity bounds on effective theories with gravity
This text mentions work from 2024 on. Those parts were partly written without a live literature search and have not been checked by an editor yet.
Basic rules such as causality and conservation of probability force certain numbers in low-energy theories to be positive. Once gravity is included, the long-range pull of the graviton (the particle carrying gravity) spoils the standard argument, and it is unclear which bounds survive.
Why it matters
These bounds decide which low-energy theories can come from a consistent theory of quantum gravity, so they turn abstract consistency into testable restrictions.
Review
C. de Rham, S. Kundu, M. Reece, A. J. Tolley, S.-Y. Zhou, Snowmass White Paper: UV Constraints on IR Physics, arXiv:2203.06805, 2022. https://arxiv.org/abs/2203.06805 reference checked
Timestamp record
- Signed record
- c287e09ddd29…
- Public log
- Entry 316, in checkpoint 2,123
- In the log by
- Block 969,698, 2026-10-03
This text was in the PubPhys log by that date. The date says nothing about when the problem was first posed.