Now showing items 408-427 of 555

    • The S-Matrix of Gauge and Gravity Theories and The Two-Black Hole Problem 

      Guevara, Alfredo (University of Waterloo, 2020-10-01)
      This thesis is devoted to diverse aspects of scattering amplitudes in gauge theory and gravity including interactions with matter particles. In Part I we focus on the applications of massive scattering amplitudes in gravity ...
    • Satellite Dynamics in Dark Matter Halos 

      Kamiab, Farbod (University of Waterloo, 2010-09-01)
      I have used an analytic model of tidal interactions to predict the evolution of a substructure in a static dark matter halo. Given the initial conditions of the satellite and background halo, the model predicts with high ...
    • Scattering Equations and S-Matrices 

      Yuan, Ye (University of Waterloo, 2015-06-25)
      We introduce a new formulation for the tree-level S-matrix in theories of massless particles. Sitting at the core of this formulation are the scattering equations, which yield a map from the kinematics of a scattering ...
    • A Search for Nearby Dwarf Galaxies 

      Xi, Chengyu (University of Waterloo, 2014-09-25)
      Dwarf galaxies can be used to trace invisible dark matter substructure. Studies of the properties of dwarf galaxy populations are crucial in solving the so-called ``Missing Satellite Problem'', and hold important implications ...
    • Searching for the Magnetic Interactions in the Rare Earth Pyrochlore Oxide Yb₂Ti₂O₇ 

      Thompson, Jordan (University of Waterloo, 2011-07-20)
      Various experiments on Yb₂Ti₂O₇ have shown evidence of strange magnetic behaviour at low temperatures. Specific heat measurements on powder samples of Yb₂Ti₂O₇ show evidence of a sharp peak, indicating the occurence of a ...
    • The Security of Simplified Trusted Relays 

      Stacey, William (University of Waterloo, 2014-08-27)
      This thesis examines the security of performing quantum key distribution (QKD) with a simplified trusted relay (STR). The protocol carries out the quantum phase of a conventional trusted relay, however, reduces the required ...
    • Security proof methods for quantum key distribution protocols 

      Ferenczi, Agnes (University of Waterloo, 2013-04-26)
      In this thesis we develop practical tools for quantum key distribution (QKD) security proofs. We apply the tools to provide security proofs for several protocols, ranging from discrete variable protocols in high dimensions, ...
    • Security Proofs for Quantum Key Distribution Protocols by Numerical Approaches 

      Lin, Jie (University of Waterloo, 2017-10-25)
      This thesis applies numerical methods to analyze the security of quantum key distribution (QKD) protocols. The main theoretical problem in QKD security proofs is to calculate the secret key generation rate. Under certain ...
    • Segregation of chain ends to the surface of a polymer melt: effect of surface profile versus chain discreteness 

      Mahmoudi, Pendar; Matsen, Mark (Springer, 2016)
      Silberberg has argued that the surface of a polymer melt behaves like a reflecting boundary on the random-walk statistics of the polymers. Although this is approximately true, independent studies have shown that violations ...
    • Selected Experiments with Proteins at Solid-Liquid Interfaces 

      Teichroeb, Jonathan (University of Waterloo, 2008-12-12)
      This thesis describes a number of novel experiments contributing to the understanding of protein adsorption from both a fundamental and applied perspective. The first three papers involve the use of the localized surface ...
    • The Self-Assembly of Particles with Isotropic Interactions 

      Konigslow, K. von; Cardenas-Mendez, E. D.; Thompson, Russell (IOP publishing, 2013-07-03)
      A generic field-theoretic model for the self-assembly of particles with isotropic interactions, motivated by ideas in DNA-mediated colloidal assembly, is presented. A simplest possible system of colloids in explicit ...
    • The Self-Assembly of Particles with Isotropic Interactions 

      Kier, von Konigslow (University of Waterloo, 2012-09-26)
      In recent years there has been much interest in the self-assembly of materials. Much of this research has been focused on the self-assembly of particles in solution (colloids), typically on the order of nanometres or ...
    • The self-assembly of particles with isotropic interactions: Using DNA coated colloids to create designer nanomaterials 

      Thompson, R. B.; Dion, S.; von Konigslow, K. (AIP publishing, 2014-04-03)
      Self-consistent field theory equations are presented that are suitable for use as a coarse-grained model for DNA coated colloids, polymer-grafted nanoparticles and other systems with approximately isotropic interactions. ...
    • Semi-Analytic Radiatively Inefficient Accretion Flows in General Gravity 

      Georgiev, Boris (University of Waterloo, 2018-01-05)
      The Event Horizon Telescope is capable of observing black holes on event-horizon scales and we can use it to explore deviations from General Relativity. We replicate the results of a previous study using a Newtonian ...
    • Sensing the shape of spacetime: detector response and entanglement harvesting in curved space 

      Ng, Keith (University of Waterloo, 2019-01-24)
      This thesis seeks to understand what information Unruh-DeWitt detectors can gain about the structure of spacetime. By coupling to the quantum state of a field on a curved space, the detectors can gain information about ...
    • A sensitive search for dark energy through chameleon scalar fields using neutron interferometry 

      Snow, W. Michael; Arif, Muhammad; Heacock, Benjamin; Huber, Michael G.; Li, Ke; Pushin, Dimitry A.; Skavysh, Vladimir; Young, Albert R. (IOP Publishing, 2015-01-22)
      The physical origin of the dark energy, which is postulated to cause the accelerated expansion rate of the universe, is one of the major open questions of cosmology. A large subset of theories postulate the existence of a ...
    • Setup and Design of a Cryogenic Testing Station with Focus on Characterization of Superconducting Devices 

      Plesha, Clifford (University of Waterloo, 2019-05-23)
      The goal of my thesis was to construct a general purpose cryostat, capable of measuring multiple devices at 100mK. This included modifying an existing SHASTA model 106 Adiabatic Demagnetization Refrigerator (ADR) by adding ...
    • Setup of Dry Cryostat for Measurements on Superconducting Microwave Resonators 

      Cockton, Nicholas (University of Waterloo, 2019-09-20)
      A cryogen-free cryostat was set up in order to perform measurements at ultra low temperatures. The setup involved the removal of an adiabatic demagnetization refrigerator (ADR) and replacing it with a dilution refrigerator ...
    • Shape dynamics and Mach's principles: Gravity from conformal geometrodynamics 

      Gryb, Sean Barry (University of Waterloo, 2011-08-26)
      We develop a new approach to classical gravity starting from Mach's principles and the idea that the local shape of spatial configurations is fundamental. This new theory, shape dynamics, is equivalent to general relativity ...
    • The Shape of Dark Matter Haloes: Results from Weak Lensing 

      Robison, Bailey (University of Waterloo, 2020-09-25)
      Dark matter haloes are expected to have a triaxial shape, appearing elliptical in projection. Understanding the orientation of these dark matter haloes, and how they are aligned, has implications for theories of structure ...

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