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Browsing Department of Physics by Title

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  • Hamiltonian formulation of ghost free mimetic massive gravity 
    Malaeb, O.; Saghir, Chireen A. (Springer New York LLC, 2019)
    We present the hamiltonian formulation of the Ghost Free Mimetic Massive Gravity theory. The linearized theory is studied and the Hamitlonian equations of motion are analyzed. Poisson brackets are computed and closure is ...
  • Hamiltonian formulation of mimetic gravity 
    Malaeb, O. (American Physical Society, 2015)
    The Hamiltonian formulation of mimetic gravity is formulated. Although there are two more equations than those of general relativity, these are proved to be the constraint equation and the conservation of the energy-momentum ...
  • Harmonicity and anharmonicity of phonon and surface phonon-polariton in high symmetry directions in wurtzite AlN 
    Karakachian, Hrag; Kazan, Michel (American Institute of Physics Inc., 2017)
    We report on the potential of self-nucleated AlN single crystals as tunable near-field infrared sources. A self-nucleated AlN crystal was grown with appropriate care to ensure minimal contact with crucible walls or other ...
  • Hypersymplectic geometry and supersymmetric solutions in (t,s) 5D supergravity 
    Sabra, Wafic A. (American Physical Society, 2021)
    Relying on the method of spinorial geometry, purely bosonic supersymmetric solutions in N=2, five-dimensional supergravity theories coupled to vector multiplets in all space-Time signatures are found. Explicit examples of ...
  • Impact of magnetic fields on Population III star formation 
    Saad, Cynthia R.; Bromm, Volker; El-Eid, Mounib F. (Oxford University Press, 2022)
    The theory of the formation of the first stars in the Universe, the so-called Population III (Pop III), has until now largely neglected the impact of magnetic fields. Complementing a series of recent studies of the ...
  • Impact of neutrino properties and dark matter on the primordial Lithium production 
    Makki, Tahani R.; El-Eid, Mounib F.; Mathews, Grant J. (World Scientific Publishing Co. Pte Ltd, 2019)
    The light elements and their isotopes were produced during standard big bang nucleosynthesis (SBBN) during the first minutes after the creation of the universe. Comparing the calculated abundances of these light species ...
  • Implications of the complex singlet field for noncommutative geometry model 
    Karimi, Hosein (Springer Verlag, 2017)
    We consider a complex singlet scalar in the spectral action approach to the standard model. It is shown that there is a range of initial values at the unification scale which is able to produce Higgs and top quark masses ...
  • Industrializing the Arab world: a speculative case study 
    Zahlan, Antoine B. (Routledge, 2014)
    Some of the challenges facing Arab countries could be solved if their economies were industrialized. They have made much progress in some fields, but have failed so far to industrialize. While this is obviously a complicated ...
  • Inhomogeneous dark energy 
    Chamseddine, Ali H.; Mukhanov, Viatcheslav F. (Institute of Physics Publishing, 2016)
    We modify Einstein General Relativity by adding non-dynamical scalar fields to account simultaneously for both dark matter and dark energy. The dark energy in this case can be distributed in-homogeneously even within horizon ...
  • Interaction between confined phonons and photons in periodic silicon resonators 
    Iskandar, A.; Gwiazda, Agnieszka; Younes, Joan; Kazan, Michel; Bruyant, Aurélien; Tabbal, Malek; Lérondel, Gilles (American Physical Society, 2018)
    In this paper, we demonstrate that phonons and photons of different momenta can be confined and interact with each other within the same nanostructure. The interaction between confined phonons and confined photons in silicon ...
  • Interpenetration and Friction of Brush-Coated Surfaces under External Load: Analytical Theory and SCF Calculations 
    Klushin, Leonid I.; Ivanova, Anna S.; Polotsky, Alexey A.; Skvortsov, Aleksander M. (American Chemical Society, 2023)
    We studied the compression and interpenetration properties of two opposing monodisperse polymer brushes under external load by analytical theory and by a numerical self-consistent field (SCF) approach. Analytical expressions ...
  • Investigation of Temperature Dependence of the Irreversibility Line of GdBa 2Cu 3O7−δ Added with Nanosized Ferrite ZnFe 2O 4 
    Awad, Ramadan; Roumié, Mohamad; Isber, Samih; Marhaba, Salem; AbouAly, A. I.; Basma, Hadi (Springer Science and Business Media, LLC, 2015)
    Superconducting samples of the type (ZnFe2O4)xGdBa2Cu3O7−δ were synthesized by the conventional solid-state reaction technique. The nanosized (ZnFe2O4) content x varied from 0 to 0.1 wt% of the samples’ total mass. The ...
  • Investigation of the Expansion of an Oxygen Microwave Remote Plasma for the Growth of Functional Oxide Thin Films 
    Al Makdessi, Georges; Tabbal, Malek (Springer New York LLC, 2017)
    The expansion of an oxygen low-pressure microwave plasma was investigated in order to determine the optimal plasma parameters for the growth of functional oxide semiconductors. Langmuir probe measurements show that the ...
  • Investigation on superconducting properties of GdBa2Cu3O7−δ added with nanosized ZnFe2O4 
    Awad, Ramadan; Abou-Aly, Aly Ibrahim; Mohammed, N. H.; Isber, Samih; Motaweh, Hussien A.; El-Said Bakeer, Douaa (Elsevier Ltd, 2014)
    The effect of nanosized ZnFe2O4, prepared by Co-precipitation method, on GdBa2Cu3O7- δ superconductor was studied. Therefore, superconducting samples of type (ZnFe2O4)xGdBa 2Cu3O7-δ, 0.0≤x≤0.1 wt.%, were prepared by the ...
  • IR photothermal and spectroscopic analysis of proton-irradiated 4H-SiC 
    Hadi, M.; Younes, Joan; Soueidan, Maher; Kazan, Michel (Elsevier B.V., 2021)
    The effect of the proton irradiation dose on thermal transport anisotropy, free carrier density, and defect formation in 4H-SiC is studied by thermal wave scattering and infrared spectroscopy. Thermal waves are generated ...
  • Kasner branes with arbitrary signature 
    Sabra, Wafic A. (Elsevier B.V., 2020)
    We present static and time-dependent solutions for the theory of gravity with a dilaton field and an arbitrary rank antisymmetric tensor. The solutions constructed are valid for arbitrary space-time dimensions and signatures. ...
  • Kasner metrics and very special geometry 
    Sabra, Wafic A. (Elsevier B.V., 2022)
    We consider general charged Kasner-like solutions for the theory of five-dimensional supergravity coupled to Abelian vector multiplets in arbitrary space-time signature. These solutions, depending on the choice of coordinates, ...
  • Kinetic roughening of the urban skyline 
    Najem, Sara A.; Krayem, Alaa; Ala-Nissilä, Tapio; Grant, Martin L. (American Physical Society, 2020)
    We analyze the morphology of the modern urban skyline in terms of its roughness properties. This is facilitated by a database of 107 building heights in cities throughout the Netherlands which allows us to compute the ...
  • Koopman operator for Burgers's equation 
    Balabane, Mikhaël; Méndez, Miguel Alfonso; Najem, Sara A. (American Physical Society, 2021)
    We consider the flow of Burgers's equation on an open set of (small) functions in L2([0,1]). We derive explicitly the Koopman decomposition of the Burgers flow. We identify the frequencies and the coefficients of this ...
  • Laplace surface dynamics, revisited: Satellites, exoplanets, and debris with distant, eccentric companions 
    Farhat, Mohammad A.; Touma, Jihad R. (Oxford University Press, 2021)
    To date, studies of Laplace surface dynamics have concerned themselves with test particle orbits of fixed shape and orientation in the combined field of an oblate central body (to which the particle is bound) and a distant, ...

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