Digitalni repozitorijum
Univerziteta u Beogradu
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New cosmological solutions of a nonlocal gravity model
Станковић, Јелена
Abstract: A nonlocal gravity model (2) was introduced and considered recently, and two exact cosmological solutions in flat space were presented. The first solution is related to some radiation effects generated by nonlocal dynamics on dark energy background, while the second one is a nonsingular time symmetric bounce. In the present paper, we investigate other possible exact cosmological solutions and find some the new ones in nonflat space. Used nonlocal gravity dynamics can change the background topology. To solve the corresponding equations of motion, we first look for a solution of the eigenvalue problem □(R−4Λ)=q(R−4Λ). We also discuss possible extension of this model with a nonlocal operator, symmetric under □⟷□−1 , and its connection with another interesting nonlocal gravity model.
https://www.mdpi.com/2073-8994/14/1/3
engleski
2022
Ovo delo je licencirano pod uslovima licence
Creative Commons CC BY-NC-ND 4.0 - Creative Commons Autorstvo - Nekomercijalno - Bez prerada 4.0 International License.
http://creativecommons.org/licenses/by-nc-nd/4.0/legalcode
Keywords: nonlocal gravity; cosmological solutions; nonsingular bounce; cosmological constant; cosmic radiation; dark energy; dynamical change of topology
10.3390/sym14010003