Tbilisi, Georgia
Tbilisi, Georgia

The Free University of Tbilisi is a private university established in 2007 via the merge of ESM Tbilisi and the Tbilisi Institute of Asia and Africa. The main goal of Kakha Bendukidze, FreeUni's founder, was providing opportunities for a quality education for every motivated adult, regardless of financial conditions, believing that clarity of purpose and the future were essential to any human endeavour.The Free University is organized into 7 constituent schools: the Institute of Asia and Africa , Business, Law, Computer science and Maths, Visual Arts and Design, Governance and Social science, Physics and Law Schools. While the Free University is governed by a combination of its Board of Overseers and the Knowledge Foundation, each school's faculty oversees its curriculum and degree programs. In addition to a central campus shared with Agricultural University of Georgia in downtown Tbilisi, the University owns facilities all around Georgia, including Anaseuli Education Center.The current Rector of The Free University is prof. Guram Chikovani. There are 56 full-time and 84 part-time lecturers. 44 hold PhDs; 25 are PhD students. The programs are run on a daily basis by deans and academic coordinators.The University consists of 7 Schools: Institute of Asia and Africa ESM Law School MACS Physics School GOV Visual Arts and Design School / VADS.↑ ↑ ↑ ↑ Wikipedia.

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Osmanov Z.,Free University of Tbilisi | Rieger F.M.,University of Heidelberg | Rieger F.M.,Max Planck Institute for Nuclear Physics
Monthly Notices of the Royal Astronomical Society | Year: 2017

The Crab Pulsar has been recently detected at very high energies (VHE) with its pulsed VHE emission reaching up to 1.5 TeV. The VHE peaks appear synchronized with the peaks at GeV energies and show VHE spectra following hard power-law functions. These new findings have been interpreted as evidence for a γ -ray production that happens very close to the light cylinder. Motivated by these experimental results, we consider the efficiency of magnetocentrifugal particle acceleration in the magnetosphere of the Crab Pulsar, reexamining and extending results obtained in a previous work. It is shown that efficient magnetocentrifugal acceleration close to the light cylinder could provide the required electron Lorentz factors of 5 × 106 and that the resulting inverse Compton (IC) scattering off thermal photons might explain the enigmatic TeV emission of the pulsar. We estimate the corresponding VHE luminosity and provide a derivation of its spectral characteristics that appear remarkably close to the observational results to encourage further studies. © 2016 The Authors.

Osmanov Z.,Free University of Tbilisi | Mahajan S.,University of Texas at Austin | Machabeli G.,Ilia State University
Astrophysical Journal | Year: 2017

Based on the collective linear and nonlinear processes in a magnetized plasma surrounding the black hole at the Galactic center (GC), an acceleration mechanism is proposed to explain the recent detection/discovery of PeV protons. In a two-stage process, the gravitation energy is first converted to the electrical energy in fast-growing Langmuir waves, and then the electrical energy is transformed to the particle kinetic energy through Landau damping of waves. It is shown that, for the characteristic parameters of GC plasma, proton energy can be boosted up to 5 PeV. © 2017. The American Astronomical Society. All rights reserved.

Kakushadze Z.,Quantigic Solutions LLC | Kakushadze Z.,Free University of Tbilisi
Journal of Informetrics | Year: 2016

We propose a new index to quantify SSRN downloads. Unlike the SSRN downloads rank, which is based on the total number of an author's SSRN downloads, our index also reflects the author's productivity by taking into account the download numbers for the papers. Our index is inspired by - but is not the same as - Hirsch's h-index for citations, which cannot be directly applied to SSRN downloads. We analyze data for about 30,000 authors and 367,000 papers. We find a simple empirical formula for the SSRN author rank via a Gaussian function of the log of the number of downloads. © 2015 Elsevier Ltd.

Chkheidze N.,Ilia State University | Machabeli G.,Ilia State University | Osmanov Z.,Free University of Tbilisi
Astrophysical Journal | Year: 2013

In the present paper, a self-consistent theory, interpreting VERITAS and the MAGIC observations of the very high-energy pulsed emission from the Crab pulsar, is considered. The photon spectrum between 10 MeV and 400 GeV can be described by two power-law functions with spectral indices of 2.0 and 3.8. The source of the pulsed emission above 10 MeV is assumed to be synchrotron radiation, which is generated near the light cylinder during the quasi-linear stage of the cyclotron instability. The emitting particles are the primary beam electrons with Lorentz factors up to 109. Such high energies of beam particles can be reached due to Landau damping of the Langmuir waves in the light cylinder region. © 2013. The American Astronomical Society. All rights reserved.

Osmanov Z.,Free University of Tbilisi | Chkheidze N.,Ilia State University
Astrophysical Journal | Year: 2013

In the present paper, we study the generation of synchrotron emission by means of the feedback of Cherenkov-drift waves on the particle distribution through the diffusion process. Despite the efficient synchrotron losses, it is demonstrated that the excited Cherenkov-drift instability leads to the quasi-linear diffusion (QLD), the effect of which is balanced by dissipation factors and, as a result, the pitch angles are prevented from damping, thus maintaining the corresponding synchrotron emission. We analyze the model for a wide range of physical parameters and determine that the mechanism of QLD guarantees the generation of electromagnetic radiation from soft X-rays up to soft γ-rays, which is strongly correlated with Cherenkov-drift emission ranging from IR up to UV energy domains. © 2013. The American Astronomical Society. All rights reserved.

Osmanov Z.,Free University of Tbilisi
International Journal of Astrobiology | Year: 2016

Assuming the possibility of existence of a supercivilization we extend the idea of Freeman Dyson considering pulsars instead of stars. It is shown that instead of a spherical shell the supercivilization must use ring-like constructions. We have found that a size of the 'ring' should be of the order of (10-4-10-1) AU with temperature interval (300-600) K for relatively slowly rotating pulsars and (10-350) AU with temperature interval (300-700) K for rapidly spinning neutron stars, respectively. Although for the latter the Dyson construction is unrealistically massive and cannot be considered seriously. Analyzing the stresses in terms of the radiation and wind flows it has been argued that they cannot significantly affect the ring construction. On the other hand, the ring in-plane unstable equilibrium can be restored by the energy which is small compared with the energy extracted from the star. This indicates that the search for infrared ring-like sources close to slowly rotating pulsars seems to be quite promising. © 2015 Cambridge University Press.

Osmanov Z.,Free University of Tbilisi
Monthly Notices of the Royal Astronomical Society | Year: 2014

In this paper, we study the possibility of generation of electromagnetic waves in the magnetospheres of radio magnetars by means of the quasi-linear diffusion (QLD). Considering the magnetosphere composed of the so-called beam and the plasma components, respectively, we argue that the frozen-in condition will inevitably lead to the generation of the unstable cyclotron modes. These modes, via the QLD, will in turn influence the particle distribution function, leading to certain values of the pitch angles, thus to an efficient synchrotron mechanism, producing radio photons. We show that for three known radio magnetars, the QLD might be a realistic mechanism for producing photons in the radio band. © 2014 The Author.

Zaza O.,Free University of Tbilisi
International Journal of Modern Physics D | Year: 2016

In this paper, we study the efficiency of particle acceleration in the magnetospheres of stellar mass black holes. For this purpose, we consider the linearized set of the Euler equation, continuity equation and Poisson equation, respectively. After introducing the varying relativistic centrifugal force, we show that the charge separation undergoes the parametric instability, leading to generation of centrifugally-excited Langmuir waves. It is shown that these waves, via the Langmuir collapse damp by means of the Landau damping, as a result, energy transfers to particles accelerating them to energies of the order of (Formula presented.) eV. © 2017 World Scientific Publishing Company

Osmanov Z.,Free University of Tbilisi
Monthly Notices of the Royal Astronomical Society | Year: 2016

In this paper, we study the generation of very high energy (VHE) emission in Crab-like pulsars driven by means of the feedback of Cherenkov drift waves on distribution of magnetospheric electrons. We have found that the unstable Cherenkov drift modes lead to the quasi-linear diffusion, keeping the pitch angles from vanishing, which in turn, maintains the synchrotron mechanism. Considering the Crab-like pulsars it has been shown that the growth rate of the Cherenkov drift instability is quite high, indicating high efficiency of the process. Analysing the mechanism for the typical parameters we have found that the Cherenkov drift emission from the extreme UV to hard X-rays is strongly correlated with the VHE synchrotron emission in the GeV band. © 2015 The Author.

Osmanov Z.,Free University of Tbilisi
International Journal of Modern Physics D | Year: 2013

We study the influence of the centrifugally driven curvature drift instability (CDI) on the dynamics of relativistic electrons in the magnetospheres of active galactic nuclei (AGN). We generalize in our previous paper by considering relativistic particles with different initial phases. Considering the Euler continuity and induction equations, by taking into account the resonant conditions, we derive the growth rate of the CDI. We show that due to the centrifugal effects, the rotational energy is efficiently pumped directly into the drift modes, that leads to the generation of a toroidal component of the magnetic field. As a result, the magnetic field lines transform into such a configuration when particles do not experience any forces and since the instability is centrifugally driven, at this stage the CDI is suspended. © 2013 World Scientific Publishing Company.

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