D. Borka
University of Belgrade
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Publication
Featured researches published by D. Borka.
Physical Review B | 2011
V. Borka Jovanović; Ivan Radović; D. Borka; Z. L. Mišković
We present several applications of the layered electron gas model to electron energy loss spectroscopy of freestanding films consisting of
Journal of Cosmology and Astroparticle Physics | 2013
D. Borka; P. Jovanović; V. Borka Jovanović; A. F. Zakharov
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Physical Review D | 2012
D. Borka; P. Jovanović; V. Borka Jovanović; Alexander F. Zakharov
graphene layers in a scanning transmission electron microscope. Using a two-fluid model for the single-layer polarizability, we discuss the evolution of high-energy plasmon spectra with
Advances in Space Research | 2014
Alexander F. Zakharov; D. Borka; V. Borka Jovanović; P. Jovanović
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Journal of Cosmology and Astroparticle Physics | 2016
Alexander F. Zakharov; P. Jovanović; D. Borka; V. Borka Jovanović
and find good agreement with the recent experimental data for both multilayer graphene with
Physical Review D | 2010
V. Borka Jovanović; S. R. Ignjatović; D. Borka; P. Jovanović
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Physical Review D | 2014
P. Jovanović; V. Borka Jovanović; D. Borka
and thick slabs of graphite. Such applications of these analytical models help shed light on several features observed in the plasmon spectra of those structures, including the role of plasmon dispersion, dynamic interference in excitations of various plasmon eigenmodes, as well as the relevance of the bulk plasmon bands, rather than surface plasmons, in classifying the plasmon peaks.
Journal of Cosmology and Astroparticle Physics | 2018
Alexander F. Zakharov; P. Jovanović; D. Borka; V. Borka Jovanović
We consider possible signatures for Yukawa gravity within the Galactic Central Parsec, based on our analysis of the S2 star orbital precession around the massive compact dark object at the Galactic Centre, and on the comparisons between the simulated orbits in Yukawa gravity and two independent sets of observations. Our simulations resulted in strong constraints on the range of Yukawa interaction Λ and showed that its most probable value in the case of S2 star is around 5000 - 7000 AU. At the same time, we were not able to obtain reliable constrains on the universal constant δ of Yukawa gravity, because the current observations of S2 star indicated that it may be highly correlated with parameter Λ in the range (0 2 they are not correlated. However, the same universal constant which was successfully applied to clusters of galaxies and rotation curves of spiral galaxies (δ = 1/3) also gives a satisfactory agreement with the observed orbital precession of the S2 star, and in that case the most probable value for the scale parameter is Λ ≈ 3000±1500 AU. Also, the Yukawa gravity potential induces precession of S2 star orbit in the same direction as General Relativity for δ > 0 and for δ < −1, and in the opposite direction for −1 < δ < 0. The future observations with advanced facilities, such as GRAVITY or/and European Extremely Large Telescope, are needed in order to verify these claims.
Journal of Cosmology and Astroparticle Physics | 2017
P. Jovanović; V. Borka Jovanović; D. Borka
We study some possible observational signatures of
Astroparticle Physics | 2016
D. Borka; P. Jovanović; V. Borka Jovanović
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