Essays about: "Asymptotic States"

Found 4 essays containing the words Asymptotic States.

1. 1. Asymptotic Symmetries and Dressed States in QED and QCD

   University essay from Stockholms universitet/Fysikum

   Author : Saimeng Zhou; [2023]
   Keywords : Dressed states; Large gauge transformation; Faddeev-Kulish formalism; Generalized coherent state operator; Wilson line; Infrared divergence; Asymptotic Hamiltonian; QED; QCD;

   Abstract : Infrared divergences arising in theories with massless gauge bosons have been shown to cancel in scattering amplitudes when using dressed states constructed from the Faddeev- Kulish approach to the asymptotic states. It has been established that these states are closely related to asymptotic symmetries of the theory, that is, non-vanishing gauge trans- formations at the asymptotic boundary. READ MORE

3. 2. Convergence Rate of the Dirichlet-Neumann Algorithm for Coupled Poisson Equations

   University essay from Lunds universitet/Matematik LTH

   Author : Morgan Görtz; [2019]
   Keywords : Dirichlet-Neumann; Dirichlet-Neumann algorithm; Poisson equation; convergence rate; finite element method; finite volume method; finite difference method; Mathematics and Statistics;

   Abstract : This thesis presents and tests the convergence rate of the Dirichlet-Neumann algorithm for two Poisson equations coupled by transmission boundary conditions. Three second order discretisation methods are used when analyzing the convergence: standard equidistant finite difference, standard adaptive linear finite element, and standard adaptive finite volume discretisation of Poisson's equation. READ MORE

4. 3. Asymptotic Symmetries and Faddeev-Kulish states in QED and Gravity

   University essay from Stockholms universitet/Fysikum

   Author : David Gaharia; [2019]
   Keywords : Faddeev-Kulish; BMS; Bondi-Metzner-Sachs; Asymptotic Symmetries; Asymptotic States; Wilson Lines; Infrared Divergence; Bloch-Nordsieck; Large Gauge Transformations; Fock; QED; Quantum Electrodynamics; Perturbative Quantum Gravity; PQG; U 1 ; Transformations; Mandelstam Quantization;

   Abstract : When calculating scattering amplitudes in gauge and gravitational theories one encounters infrared (IR) divergences associated with massless fields. These are known to be artifacts of constructing a quantum field theory starting with free fields, and the assumption that in the asymptotic limit (i.e. READ MORE

5. 4. Non-linearstates in parallel Blasius boundary layer

   University essay from KTH/Numerisk analys, NA

   Author : Muhammed Abdullah Al Ahad; [2014]
   Keywords : ;

   Abstract : There is large theoretical, experimental and numerical interest in studying boundary layers, which develop around any body moving through a fluid. The simplest of these boundary layers lead to the theoretical abstraction of a so-called Blasius boundary layer, which can be derived under the assumption of a flat plate and zero external pressure gradient. READ MORE