Seminar za geometriju i primene, 21. oktobar 2021.

Naredni sastanak Seminara biće održan onlajn u četvrtak, 21. oktobra 2021. od 16.20 – 16.45 u okviru skupa 2nd Conference on Nonlinearity.

Predavač: dr Jelena Stanković, Učiteljski fakultet, Univerzitet u Beogradu

Naslov predavanja: NONLOCAL DE SITTER GRAVITY AND ITS COSMOLOGY

Apstrakt:
General relativity (GR), i.e. Einstein theory of gravity, is recognized as one of the best physical theories - with nice theoretical properties and significant phenomenological confirmations. Nevertheless, GR is not a complete theory of gravity and there are many attempts to modify it. One of the actual approaches towards more complete theory is nonlocal modified gravity. Nonlocal gravity model, which we consider here without matter, is given by the action, where R is scalar curvature and Λ-cosmological constant. Derivation of equations of motion is presented in [1]. We plan to present a brief review of general properties, and then discuss exact cosmological solutions.

One of the exact cosmological solutions mimics the dark matter and the dark energy, see [2]. Computed cosmological parameters are in a good agreement with standard model of cosmology.

References
[1] I. Dimitrijević, B. Dragović, Z. Rakić and J. Stanković, Variations of infinite derivative modified gravity, Springer Proc. Math. Stat. 263 (2018) 91-111.
[2] I. Dimitrijević, B. Dragović, A.S. Koshelev, Z. Rakić and J. Stanković, Cosmological solutions of a nonlocal square root gravity, Phys. Lett. B 797 (2019) 134848.

Detaljniji apstrakt, kao i informacije o ostalim predavanjima na naučnom skupu "2nd Conference on Nonlinearity" možete naći na sajtu http://www.nonlinearity2021.matf.bg.ac.rs.

Da biste mogli da slobodno pratite predavanja, potrebno je da se registrujete (ime, institucija i elektronska pošta) na sajtu konferencije.



Ostavite vaš komentar:


(opciono)
(nece biti prikazano)