Nonlocal gravity cosmology: An overview
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989100%3A27120%2F22%3A10250360" target="_blank" >RIV/61989100:27120/22:10250360 - isvavai.cz</a>
Result on the web
<a href="https://www.worldscientific.com/doi/10.1142/S0218271822300099" target="_blank" >https://www.worldscientific.com/doi/10.1142/S0218271822300099</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1142/S0218271822300099" target="_blank" >10.1142/S0218271822300099</a>
Alternative languages
Result language
angličtina
Original language name
Nonlocal gravity cosmology: An overview
Original language description
We discuss some main aspects of theories of gravity containing nonlocal terms in view of cosmological applications. In particular, we consider various extensions of general relativity based on geometrical invariants as f (R, square(-1) R), f (G, square(-1) G) and f (T, square(-1) T) gravity where R is the Ricci curvature scalar, G is the Gauss-Bonnet topological invariant, T the torsion scalar and the operator square(-1) gives rise to nonlocality. After selecting their functional form by using Noether symmetries, we find out exact solutions in a cosmological background. It is possible to reduce the dynamics of selected models and to find analytic solutions for the equations of motion. As a general feature of the approach, it is possible to address the accelerated expansion of the Hubble flow at various epochs, in particular the dark energy issues, by taking into account nonlocality corrections to the gravitational Lagrangian. On the other hand, it is possible to search for gravitational nonlocal effects also at astrophysical scales. In this perspective, we search for symmetries of f(R, square R-1) gravity also in a spherically symmetric background and constrain the free parameters, Specifically, by taking into account the S2 star orbiting around the Galactic Center SgrA*, it is possible to study how nonlocality affects stellar orbits around such a massive self-gravitating object.
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
10300 - Physical sciences
Result continuities
Project
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Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2022
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
International Journal of Modern Physics D
ISSN
0218-2718
e-ISSN
1793-6594
Volume of the periodical
31
Issue of the periodical within the volume
06
Country of publishing house
SG - SINGAPORE
Number of pages
42
Pages from-to
"nestrankovano"
UT code for WoS article
000797247400001
EID of the result in the Scopus database
2-s2.0-85121581471