Loops rescue the no-boundary proposal
General Relativity and Quantum Cosmology
2018-11-20 v2 Cosmology and Nongalactic Astrophysics
High Energy Physics - Theory
Abstract
New and non-trivial 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.
Cite
@article{arxiv.1810.09871,
title = {Loops rescue the no-boundary proposal},
author = {Martin Bojowald and Suddhasattwa Brahma},
journal= {arXiv preprint arXiv:1810.09871},
year = {2018}
}
Comments
7 pages including supplementary material; comments welcome; v2: matches published version