Generalized unimodular gravity as a new form of k-essence
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378271%3A_____%2F21%3A00554742" target="_blank" >RIV/68378271:_____/21:00554742 - isvavai.cz</a>
Result on the web
<a href="https://doi.org/10.1103/PhysRevD.103.064035" target="_blank" >https://doi.org/10.1103/PhysRevD.103.064035</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1103/PhysRevD.103.064035" target="_blank" >10.1103/PhysRevD.103.064035</a>
Alternative languages
Result language
angličtina
Original language name
Generalized unimodular gravity as a new form of k-essence
Original language description
We consider modifications of general relativity characterized by a special noncovariant constraint on metric coefficients, which effectively generates a perfect-fluid type of matter stress tensor in Einstein equations. Such class of modified gravity models includes recently suggested generalized unimodular gravity (GUMG), its simplest version-unimodular gravity-and self-gravitating media theories. We make these gravity models covariant by introducing four Stueckelberg fields and show that in the case of generalized unimodular gravity three out of these fields dynamically decouple. This means that the covariant form of generalized unimodular gravity is dynamically equivalent a special form of k-essence theory with translationally noninvariant kinetic term in the Lagrangian which can be reconstructed from the parameters of GUMG theory.
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
—
OECD FORD branch
10303 - Particles and field physics
Result continuities
Project
<a href="/en/project/GA20-28525S" target="_blank" >GA20-28525S: Strong Gravity as a Microscope for the Dark Universe</a><br>
Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
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
Physical Review D
ISSN
2470-0010
e-ISSN
2470-0029
Volume of the periodical
103
Issue of the periodical within the volume
6
Country of publishing house
US - UNITED STATES
Number of pages
15
Pages from-to
064035
UT code for WoS article
000648552800012
EID of the result in the Scopus database
2-s2.0-85103096799