Loop quantum gravity, signature change, and the no-boundary proposal

Martin Bojowald, Suddhasattwa Brahma

Research output: Contribution to journalArticlepeer-review

8 Scopus citations


Covariant models of loop quantum gravity generically imply dynamical signature change at high density. This article presents detailed derivations that show the fruitful interplay of this new kind of signature change with wave-function proposals of quantum cosmology, such as the no-boundary and tunneling proposals. In particular, instabilities of inhomogeneous perturbations found in a Lorentzian path-integral treatment are naturally cured. Importantly, dynamical signature change does not require Planckian densities when off-shell instantons are relevant.

Original languageEnglish (US)
Article number106023
JournalPhysical Review D
Issue number10
StatePublished - Nov 23 2020

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)


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