Sökning: "Asymptotic States"
Hittade 4 uppsatser innehållade orden Asymptotic States.
1. Asymptotic Symmetries and Dressed States in QED and QCD
Master-uppsats, Stockholms universitet/FysikumSammanfattning : 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. LÄS MER
2. Convergence Rate of the Dirichlet-Neumann Algorithm for Coupled Poisson Equations
Master-uppsats, Lunds universitet/Matematik LTHSammanfattning : 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. LÄS MER
3. Asymptotic Symmetries and Faddeev-Kulish states in QED and Gravity
Master-uppsats, Stockholms universitet/FysikumSammanfattning : 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. LÄS MER
4. Non-linearstates in parallel Blasius boundary layer
Master-uppsats, KTH/Numerisk analys, NASammanfattning : 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. LÄS MER