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6 papers · 2 filters
Cosmology of non-local f(R) gravity
I. Dimitrijevic, B. Dragovich, A. S. Koshelev +2
We consider a modification of GR with a special type of a non-local f(R). The structure of the non-local operators is motivated by the string field theory and p-adic string theory.…
Some Cosmological Solutions of a Nonlocal Modified Gravity
Ivan Dimitrijevic, Branko Dragovich, Jelena Grujic +1
We consider nonlocal modification of the Einstein theory of gravity in framework of the pseudo-Riemannian geometry. The nonlocal term has the form $\mathcal{H}(R) \mathcal{F}(\Box)…
T-dualization in a curved background in absence of a global symmetry
Lj. Davidović, B. Sazdović
We investigate T-duality of a closed string moving in a weakly curved background of the second order. A previously discussed weakly curved background consisted of a flat metric and…
T-dualization of type II superstring theory in double space
Bojan Nikolić, Branislav Sazdović
In this article we offer the new interpretation of T-dualization procedure of type II superstring theory in double space framework. We use the ghost free action of type II superstr…
T-duality as coordinates permutation in double space for weakly curved background
Branislav Sazdovic
In the paper [1] we showed that in double space, where all initial coordinates are doubled , the T-duality transformations can be performed by exchanging places o…
T-duality as coordinates permutation in double space
B. Sazdović
We introduce the dimensional double space with the coordinates which components are the coordinates of initial space and its T-dual . We shall sho…