AUB ScholarWorks

Browsing Department of Physics by Title

Browsing Department of Physics by Title

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  • Quanta of geometry and unification 
    Chamseddine, Ali H. (World Scientific Publishing Co. Pte Ltd, 2016)
    This is a tribute to Abdus Salam's memory whose insight and creative thinking set for me a role model to follow. In this contribution I show that the simple requirement of volume quantization in spacetime (with Euclidean ...
  • Quanta of geometry: Noncommutative aspects 
    Chamseddine, Ali H.; Connes, Alain; Mukhanov, Viatcheslav F. (American Physical Society, 2015)
    In the construction of spectral manifolds in noncommutative geometry, a higher degree Heisenberg commutation relation involving the Dirac operator and the Feynman slash of real scalar fields naturally appears and implies, ...
  • Raman measurement of the effect of lattice defects on the two-phonon density of states in ZnO 
    Nour-Al-Deen, Ibrahim; El-Kurdi, Riham; Patra, Digambara; Kazan, Michel (John Wiley and Sons Ltd, 2021)
    The resonance of the (Formula presented.) mode of the zinc oxide (ZnO) lattice occurs near a ridge-like structure of the two-phonon density of states (DOS). The renormalization of the harmonic frequency of the (Formula ...
  • Random spacing between metal tree electrodeposits in linear DLA arrays 
    Tannous, Jaad; Anouti, Lina; Sultan, Rabih F. (MDPI AG, 2018)
    When we examine the random growth of trees along a linear alley in a rural area, we wonder what governs the location of those trees, and hence the distance between adjacent ones. The same question arises when we observe ...
  • Real Killing spinors in neutral signature 
    Gutowski, Jan B.; Sabra, Wafic A. (Springer, 2019)
    Spinorial geometry methods are used to classify solutions admitting Majorana Killing spinors of the minimal 4-dimensional supergravity in neutral signature, with van- ishing cosmological constant and a single Maxwell field ...
  • Resolving cosmological singularities 
    Chamseddine, Ali H.; Mukhanov, Viatcheslav F. (Institute of Physics Publishing, 2017)
    We find a simple modification of the longitudinal mode in General Relativity which incorporates the idea of limiting curvature. In this case the singularities in contracting Friedmann and Kasner universes are avoided, and ...
  • Scalar curvature in discrete gravity 
    Chamseddine, Ali H.; Malaeb, O.; Najem, Sara A. (Springer Science and Business Media Deutschland GmbH, 2022)
    We focus on studying, numerically, the scalar curvature tensor in a two-dimensional discrete space. The continuous metric of a two-sphere is transformed into that of a lattice using two possible slicings. In the first, we ...
  • Secular instabilities of Keplerian stellar discs 
    Kaur, Karamveer; Kazandjian, Mher V.; Sridhar, S.; Touma, Jihad R. (Oxford University Press, 2018)
    We present idealized models of a razor-thin, axisymmetric, Keplerian stellar disc around a massive black hole, and study non-axisymmetric secular instabilities in the absence of either counter-rotation or loss cones. These ...
  • Selective Colloid Transport across Planar Polymer Brushes 
    Laktionov, Mikhail Y.; Zhulina, Ekaterina B.; Klushin, Leonid I.; Richter, Ralf P.; Borisov, Oleg V. (John Wiley and Sons Inc, 2023)
    Polymer brushes are attractive as surface coatings for a wide range of applications, from fundamental research to everyday life, and also play important roles in biological systems. How colloids (e.g., functional nanoparticles, ...
  • Sharp and fast: Sensors and switches based on polymer brushes with adsorption-active minority chains 
    Klushin, Leonid I.; Skvortsov, Aleksander M.; Polotsky, Alexey A.; Qi, Shuanhu; Schmid, Friederike (American Physical Society, 2014)
    We propose a design for polymer-based sensors and switches with sharp switching transition and fast response time. The switching mechanism involves a radical change in the conformations of adsorption-active minority chains ...
  • Shepherding in a Self-gravitating Disk of Trans-Neptunian Objects 
    Sefilian, Antranik A.; Touma, Jihad R. (Institute of Physics Publishing, 2019)
    A relatively massive and moderately eccentric disk of trans-Neptunian objects (TNOs) can effectively counteract apse precession induced by the outer planets, and in the process shepherd highly eccentric members of its ...
  • Short spin waves excitation in spin Hall nano-oscillators 
    Haidar, Mohammad (Elsevier B.V., 2023)
    This study investigates the excitation of short-wavelength spin waves (SWs) in nanowire-based spin-Hall nano-oscillators (SHNOs). Using micromagnetic simulations, we study the wavelength of propagating SWs as a function ...
  • Spectral action in matrix form 
    Chamseddine, Ali H.; Iliopoulos, John; van Suijlekom, Walter Daniël (Springer Science and Business Media Deutschland GmbH, 2020)
    Quantization of the noncommutative geometric spectral action has so far been performed on the final component form of the action where all traces over the Dirac matrices and symmetry algebra are carried out. In this work, ...
  • Spin wave excitations in a nanowire spin Hall oscillator with perpendicular magnetic anisotropy 
    Succar, Malek; Haidar, Mohammad (American Institute of Physics Inc., 2023)
    Spin torque oscillators (STOs) are emerging microwave devices that can potentially be used in spin-logic devices and the next-generation high-speed computing architecture. Thanks to their non-linear nature, STOs are easily ...
  • Steady and transient states in low-energy swarms: Stability and first-passage times 
    Al-Sayegh, Amara A.; Klushin, Leonid I.; Touma, Jihad R. (American Physical Society, 2016)
    We investigate a class of agent-based models of self-propelled particles (SPP) that interact according to a Morse potential in the presence of friction, a class which was able to reproduce many of the intriguing patterns ...
  • Stellar dynamics around a massive black hole - I. Secular collisionless theory 
    Sridhar, S.; Touma, Jihad R. (Oxford University Press, 2016)
    We present a theory in three parts, of the secular dynamics of a (Keplerian) stellar system of mass M orbiting a black hole of mass M• ≫ M. Here we describe the collisionless dynamics; Papers II and III are on the (collisional) ...
  • Stellar dynamics around a massive black hole - II. Resonant relaxation 
    Sridhar, S.; Touma, Jihad R. (Oxford University Press, 2016)
    We present a first-principles theory of resonant relaxation (RR) of a low-mass stellar system orbiting a more massive black hole (MBH). We first extend the kinetic theory of Gilbert to include the Keplerian field of a black ...
  • Stellar dynamics around a massive black hole - III. Resonant relaxation of razor-thin axisymmetric discs 
    Sridhar, S.; Touma, Jihad R. (Oxford University Press, 2017)
    We study the resonant relaxation (RR) of an axisymmetric, low-mass (or Keplerian) stellar disc orbiting a more massive black hole (MBH). Our recent work on the general kinetic theory of RR is simplified in the standard ...
  • Stimuli-Responsive Brushes with Active Minority Components: Monte Carlo Study and Analytical Theory 
    Qi, Shuanhu; Klushin, Leonid I.; Skvortsov, Aleksander M.; Polotsky, Alexey A.; Schmid, Friederike (American Chemical Society, 2015)
    Using a combination of analytical theory, Monte Carlo simulations, and three-dimensional self-consistent field calculations, we study the equilibrium properties and the switching behavior of adsorption-active polymer chains ...
  • Stress evolution in Si during low-energy ion bombardment 
    Ishii, Yohei; Madi, Charbel S.; Aziz, Michael J.; Chason, Eric H. (Cambridge University Press, 2014)
    Measurements of stress evolution during low-energy argon ion bombardment of Si have been made using a real-time wafer curvature technique. During irradiation, the stress reaches a steady-state compressive value that depends ...

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