Loops Rescue the No-Boundary Proposal

Martin Bojowald, Suddhasattwa Brahma

Research output: Contribution to journalArticlepeer-review

23 Scopus citations


New and nontrivial properties of off-shell instantons in loop quantum cosmology show that dynamical signature change naturally cures recently observed problems in the semiclassical path integral of quantum gravity. If left unsolved, these problems would doom any theory of smooth initial conditions of the Universe. The no-boundary proposal, as a specific example of such a theory, is rescued by loops, presenting a rare instance of a fruitful confluence of different approaches to quantum cosmology.

Original languageEnglish (US)
Article number201301
JournalPhysical review letters
Issue number20
StatePublished - Nov 13 2018

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy


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