Sökning: "QED"

Visar resultat 1 - 5 av 46 avhandlingar innehållade ordet QED.

  1. 1. QED and collective effects in vacuum and plasmas

    Författare :Joakim Lundin; Mattias Marklund; Thomas Heinzl; Umeå universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; QED; quantum electrodynamics; quantum plasmas; quantum vacuum; Plasma physics; Plasmafysik; fysik; Physics;

    Sammanfattning : The theory of quantum electrodynamics (QED) was born out of an attempt to merge Einsteins theory of special relativity and quantum mechanics. Einsteins energy/mass equivalence together with Heisenberg's uncertainty principle allows for particle pairs to be spontaneously created and annihilated in vacuum. LÄS MER

  3. 2. QED with external fields : vacuum effects and thermodynamics

    Författare :Per Liljenberg; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; density; QED; vacuum magnetization; unstable vacuum; finite temperature; external field; boson stars; relativistic Bose gas;

    Sammanfattning : .... LÄS MER

  4. 3. Finite temperature and density QED with external fields

    Författare :David Persson; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; magnetic; chemical potential; effective action; density; finite temperature; relativistic fermion gas; QED;

    Sammanfattning : .... LÄS MER

  5. 4. Time dependent processes incavity QED

    Författare :Jonas Larson; KTH; []
    Nyckelord :cavity QED; state preparation; non-classical; Jaynes-Cummings model; Fock state; measurement;

    Sammanfattning : Cavity quantum electrodynamics (QED) has become one of themost successful tools for quantum information processing, butalso for the study of other pure quantum effects. In thisthesis we investigate one such system, the micromaser; an atomtraverse a cavity and interacts with the quantized modes of thecavity field. LÄS MER

  7. 5. The Chirality-Flow Formalism and Optimising Scattering Amplitudes

    Författare :Andrew Lifson; Partikel- och kärnfysik; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Spinor-helicity formalism; Chirality-flow formalism; Helicity amplitudes; Standard Model; QED; QCD; Optimisations; Colour expansion; Phenomenology; Fysicumarkivet A:2023:Lifson;

    Sammanfattning : This thesis is composed of five papers, which all attempt to optimise calculations of scattering amplitudes in high-energy-physics collisions. These scattering amplitudes are a key part of theoretical predictions for particle-physics experiments like the Large Hadron Collider at CERN. LÄS MER