Losing the trace to find dynamical Newton or Planck constants
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378271%3A_____%2F21%3A00554630" target="_blank" >RIV/68378271:_____/21:00554630 - isvavai.cz</a>
Alternative codes found
RIV/00216208:11320/21:10438357
Result on the web
<a href="https://doi.org/10.1088/1475-7516/2021/04/028" target="_blank" >https://doi.org/10.1088/1475-7516/2021/04/028</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1088/1475-7516/2021/04/028" target="_blank" >10.1088/1475-7516/2021/04/028</a>
Alternative languages
Result language
angličtina
Original language name
Losing the trace to find dynamical Newton or Planck constants
Original language description
We show that promoting the trace part of the Einstein equations to a trivial identity results in the Newton constant being an integration constant. Thus, in this formulation the Newton constant is a global dynamical degree of freedom which is also a subject to quantization and quantum fluctuations. This is similar to what happens to the cosmological constant in the unimodular gravity where the trace part of the Einstein equations is lost in a different way. We introduce a constrained variational formulation of these modified Einstein equations. Then, drawing on analogies with the Henneaux-Teitelboim action for unimodular gravity, we construct different general-covariant actions resulting in these dynamics. The inverse of dynamical Newton constant is canonically conjugated to the Ricci scalar integrated over spacetime. Surprisingly, instead of the dynamical Newton constant one can formulate an equivalent theory with a dynamical Planck constant.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10303 - Particles and field physics
Result continuities
Project
Result was created during the realization of more than one project. More information in the Projects tab.
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Others
Publication year
2021
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Journal of Cosmology and Astroparticle Physics
ISSN
1475-7516
e-ISSN
1475-7516
Volume of the periodical
4
Issue of the periodical within the volume
Apr.
Country of publishing house
GB - UNITED KINGDOM
Number of pages
27
Pages from-to
028
UT code for WoS article
000644501000039
EID of the result in the Scopus database
2-s2.0-85104507892