Quantum curvature fluctuations and the cosmological constant in a single plaquette quantum gravity model

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216224%3A14310%2F25%3A00140754" target="_blank" >RIV/00216224:14310/25:00140754 - isvavai.cz</a>
Result on the web
<a href="https://iopscience.iop.org/article/10.1088/1361-6382/ada90c" target="_blank" >https://iopscience.iop.org/article/10.1088/1361-6382/ada90c</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1088/1361-6382/ada90c" target="_blank" >10.1088/1361-6382/ada90c</a>

Result language
angličtina
Original language name
Quantum curvature fluctuations and the cosmological constant in a single plaquette quantum gravity model
Original language description
Understanding the microscopic behavior of spacetime, in particular quantum uncertainty in the Ricci scalar, is critical for developing a theory of quantum gravity and perhaps solving the cosmological constant problem. To test this, we compute this quantity for a simple but exact discrete quantum gravity model based on a single plaquette of spacetime. Our results confirm initial speculations of Wheeler from 1955 in finding a UV divergence in the quantum uncertainty. We further show that this behavior is stable under renormalization, but potentially unstable with the introduction of a cosmological constant, suggesting that a bare cosmological constant is ruled out.
Czech name
—
Czech description
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Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
—
OECD FORD branch
10100 - Mathematics

Project
<a href="/en/project/EH22_010%2F0007541" target="_blank" >EH22_010/0007541: MSCAfellow6_MUNI</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year
2025
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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