Sökning: "abelian and non-abelian gauge theories"

Hittade 4 uppsatser innehållade orden abelian and non-abelian gauge theories.

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

   Master-uppsats, Stockholms universitet/Fysikum

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

   Sammanfattning : 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

3. 2. Gribov ambiguities in non-Abelian gauge theories

   Kandidat-uppsats, Lunds universitet/Teoretisk partikelfysik - Geonomgår omorganisation

   Författare :Fredrik Granström; [2021]
   Nyckelord :Physics and Astronomy;

   Sammanfattning : This thesis investigates the quantization of field theories using the functional integral formalism. Gauge invariance necessitates a gauge-fixing procedure that chooses a unique field configuration from each gauge orbit. LÄS MER

4. 3. QFT and Spontaneous Symmetry Breaking

   Kandidat-uppsats, Uppsala universitet/Teoretisk fysik

   Författare :Sheila Chauwinoir; [2020]
   Nyckelord :quantum field theory; abelian and non-abelian gauge theories; quantum electrodynamics; quantum chromodynamics; electroweak interaction; spontaneous symmetry breaking; higgs mechanism;

   Sammanfattning : The aim of this project is to understand the structure of the Standard Model of the particle physics. Therefore quantum field theories (QFT) are studied in the both cases of abelian and non-abelian gauge theories i.e. quantum electrodynamics (QED), quantum chromodynamics (QCD) and electroweak interaction are reviewed. LÄS MER

5. 4. Renormalization in Field Theories

   L3-uppsats, Uppsala universitet/Teoretisk fysik

   Författare :Alexander Söderberg; [2015]
   Nyckelord :renormalization in field theories; renormalization; quantum field theories; quantum field theory; quantum mechanics; quantum physics; quantum; physics; mechanics; field theory; theory; theories; fields; field; regularization; dimensional regularization; dimensional; perturbative; perturbative renormalization; wilsonian approach; wilsonian; approach; momentum cutoff; momentum; cutoff; callan; symanzik; equation; callan symanzik equation; coleman; weinberg; model; potential; effective; coleman-weinberg potential; beta function; beta; non abelian; gauge; non abelian gauge theory; non abelian gauge theories; qed; quantum electrodynamics; electrodynamics; qcd; quantum chromodynamics; chromodynamics;

   Sammanfattning : Several different approaches to renormalization are studied. The Callan-Symanzik equation is derived and we study its beta functions. An effective potential for the Coleman-Weinberg model is studied to find that the beta function is positive and that spontaneous symmetry breaking will occur if we expand around the classical field. LÄS MER