Emergent modified gravity

Martin Bojowald, Erick I. Duque

Research output: Contribution to journalArticlepeer-review

2 Scopus citations


A complete canonical formulation of general covariance makes it possible to construct new modified theories of gravity that are not of higher-curvature form, as shown here in a spherically symmetric setting. The usual uniqueness theorems are evaded by using a crucial and novel ingredient, allowing for fundamental fields of gravity distinct from an emergent space-time metric that provides a geometrical structure to all solutions. As specific examples, there are new expansion-shear couplings in cosmological models, a form of modified Newtonian dynamics can appear in a space-time covariant theory without introducing extra fields, and related effects help to make effective models of canonical quantum gravity fully consistent with general covariance.

Original languageEnglish (US)
Article number095008
JournalClassical and Quantum Gravity
Issue number9
StatePublished - May 2 2024

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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