Effective relational cosmological dynamics from quantum gravity
Abstract We discuss the relational strategy to solve the problem of time in quantum gravity and different ways in which it could be implemented, pointing out in particular the fundamentally new dimension that the problem takes in a quantum gravity context in which spacetime and geometry are understo...
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Online Access: | https://doi.org/10.1007/JHEP05(2021)025 |
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doaj-c8fe9b1e14624f3a82b06ed408a281ce2021-05-09T11:07:31ZengSpringerOpenJournal of High Energy Physics1029-84792021-05-012021516010.1007/JHEP05(2021)025Effective relational cosmological dynamics from quantum gravityLuca Marchetti0Daniele Oriti1Università di PisaArnold Sommerfeld Center for Theoretical Physics, Ludwig-Maximilians-Universität MünchenAbstract We discuss the relational strategy to solve the problem of time in quantum gravity and different ways in which it could be implemented, pointing out in particular the fundamentally new dimension that the problem takes in a quantum gravity context in which spacetime and geometry are understood as emergent. We realize concretely the relational strategy we have advocated in the context of the tensorial group field theory formalism for quantum gravity, leading to the extraction of an effective relational cosmological dynamics from quantum geometric models. We analyze in detail the emergent cosmological dynamics, highlighting the improvements over previous work, the contribution of the quantum properties of the relational clock to it, and the interplay between the conditions ensuring a bona fide relational dynamics throughout the cosmological evolution and the existence of a quantum bounce resolving the classical big bang singularity.https://doi.org/10.1007/JHEP05(2021)025Models of Quantum GravityCosmology of Theories beyond the SM |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Luca Marchetti Daniele Oriti |
spellingShingle |
Luca Marchetti Daniele Oriti Effective relational cosmological dynamics from quantum gravity Journal of High Energy Physics Models of Quantum Gravity Cosmology of Theories beyond the SM |
author_facet |
Luca Marchetti Daniele Oriti |
author_sort |
Luca Marchetti |
title |
Effective relational cosmological dynamics from quantum gravity |
title_short |
Effective relational cosmological dynamics from quantum gravity |
title_full |
Effective relational cosmological dynamics from quantum gravity |
title_fullStr |
Effective relational cosmological dynamics from quantum gravity |
title_full_unstemmed |
Effective relational cosmological dynamics from quantum gravity |
title_sort |
effective relational cosmological dynamics from quantum gravity |
publisher |
SpringerOpen |
series |
Journal of High Energy Physics |
issn |
1029-8479 |
publishDate |
2021-05-01 |
description |
Abstract We discuss the relational strategy to solve the problem of time in quantum gravity and different ways in which it could be implemented, pointing out in particular the fundamentally new dimension that the problem takes in a quantum gravity context in which spacetime and geometry are understood as emergent. We realize concretely the relational strategy we have advocated in the context of the tensorial group field theory formalism for quantum gravity, leading to the extraction of an effective relational cosmological dynamics from quantum geometric models. We analyze in detail the emergent cosmological dynamics, highlighting the improvements over previous work, the contribution of the quantum properties of the relational clock to it, and the interplay between the conditions ensuring a bona fide relational dynamics throughout the cosmological evolution and the existence of a quantum bounce resolving the classical big bang singularity. |
topic |
Models of Quantum Gravity Cosmology of Theories beyond the SM |
url |
https://doi.org/10.1007/JHEP05(2021)025 |
work_keys_str_mv |
AT lucamarchetti effectiverelationalcosmologicaldynamicsfromquantumgravity AT danieleoriti effectiverelationalcosmologicaldynamicsfromquantumgravity |
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1721454756338073600 |