Seminar za geometriju, obrazovanje i vizuelizaciju sa primenama, 30. oktobar 2014.
- 27. Oktobar, 2014
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Naredni sastanak seminara biće održan u četvrtak, 30. oktobra 2014. u sali 301f Matematičkog instituta SANU sa početkom u 17:15.
Predavač: Ivan Dimitrijević, Matematički fakultet, Univerzitet u Beogradu
Naslov predavanja: Cosmological perturbation in nonlocal gravity
Sadržaj: After discovery of accelerating expansion of the Universe, there has been a renewed interest in gravity modification. One of promising approaches is nonlocal modification with the Ricci curvature $R$ in the action replaced by a suitable function $F (R, Box), $ where $Box = frac{1}{sqrt{-g}}partial_{mu} sqrt{-g} g^{mu
u} partial_{
u}$ is the Laplace-Beltrami operator. In particular we analyze the modification in the form egin{equation*} S = displaystyle int sqrt{-g}Big(frac{R}{16 pi G} + R^{-1} mathcal{F}(Box)R Big) d^{4}x, end{equation*} where $mathcal{F} (Box)$ is an analytic function. Also we will discuss perturbations of this model with de Sitter background.
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