TY - JOUR
T1 - Loops Rescue the No-Boundary Proposal
AU - Bojowald, Martin
AU - Brahma, Suddhasattwa
N1 - Funding Information:
The authors are grateful to Job Feldbrugge, Jean-Luc Lehners, and Neil Turok for discussions, and to the Perimeter Institute for Theoretical Physics for hospitality. Research at Perimeter Institute is supported by the Government of Canada through Innovation, Science and Economic Development, Canada and by the Province of Ontario through the Ministry of Research, Innovation and Science. This work was supported in part by National Science Foundation Grant No. PHY-1607414. S. B. is supported in part by the Ministry of Science, ICT & Future Planning, Gyeongsangbuk-do and Pohang City, and the National Research Foundation of Korea Grant No. 2018R1D1A1B07049126.
Publisher Copyright:
© 2018 American Physical Society.
PY - 2018/11/13
Y1 - 2018/11/13
N2 - 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.
AB - 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.
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U2 - 10.1103/PhysRevLett.121.201301
DO - 10.1103/PhysRevLett.121.201301
M3 - Article
C2 - 30500240
AN - SCOPUS:85056694654
SN - 0031-9007
VL - 121
JO - Physical review letters
JF - Physical review letters
IS - 20
M1 - 201301
ER -