Sökning: "Quantum Field Theory"

Visar resultat 16 - 20 av 94 uppsatser innehållade orden Quantum Field Theory.

  1. 16. Beyond the Gross-Pitaevskii Equation: A Perturbative Approach

    Master-uppsats, Lunds universitet/Fysiska institutionen; Lunds universitet/Teknisk fysik (CI)

    Författare :Anton Johansson; [2023]
    Nyckelord :Gross-Pitaevskii; Beyond mean-field; Many-body Perturbation Theory; Bose-Einstein Condensate; BEC; Physics and Astronomy;

    Sammanfattning : We propose and implement a beyond Gross-Pitaevskii approach based on Many-Body Perturbation theory (MBPT) for the study of Bose-Einstein Condensate (BECs) ground states. Two partitions of the system Hamiltonian are considered. LÄS MER

  3. 17. Non-perturbative models of diffractive hadronic collisions

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

    Författare :Edgars Karnickis; [2022]
    Nyckelord :diffractive process; proton-proton collision; elastic; parton; PDF; saturation; Physics and Astronomy;

    Sammanfattning : In this thesis, a new model for diffractive proton-proton collisions is presented. Interpreting protons as systems of many partons, we treat diffraction in terms of elastic interactions between the partons of the colliding protons. LÄS MER

  4. 18. Femtosecond-laser Written Integrated Optical Devices for Quantum Circuits

    Master-uppsats, KTH/Tillämpad fysik

    Författare :Ang Chen; [2022]
    Nyckelord :Quantum optics; femtosecond-laser waveguide writing; integrated quantum photonics; photonic circuits; quantum technology.; Kvantoptik; femtosekundlaservågledarskrivning; integrerad kvantfotonik; fotonikkretsar; kvantteknologi.;

    Sammanfattning : Integrated quantum photonic circuits have gained increasing interest in the field of quantum information, due to their compactness, the intrinsic stability and the potential scalability. Photons are the promising candidate for quantum information processing. LÄS MER

  5. 19. Calculating scattering amplitudes in φ3 and Yang-mills theory using perturbiner methods

    L3-uppsats, Uppsala universitet/Teoretisk fysik

    Författare :Daniel Nilsson; Magnus Bertilsson; [2022]
    Nyckelord :QFT; Quantum; Quantum field theory; scattering amplitudes; Berends Giele Currents; feynman diagrams; n particle scattering;

    Sammanfattning : We calculate tree-level scattering amplitudes in φ^3 theory and Yang-Mills theory by means of the perturbiner expansion. This involves solving the Euler-Lagrange equations of motion perturbatively via a multi-particle ansatz, and using Berends-Giele recursion relations to extract the solution from simple on-shell data. LÄS MER

  7. 20. Rare Weak Decays of the Omega Baryon

    Master-uppsats, Uppsala universitet/Kärnfysik

    Författare :Cornelis Johannes Gerardus Mommers; [2022]
    Nyckelord :hadron; physics; nuclear; particle;

    Sammanfattning : We study rare decays of the Omega baryon using SU(3) chiral perturbation theory, a successfuleffective field theory of quantum chromodynamics at low energies. At leading-order, we calculatethe branching fractions of the decay Ω− → Ξππ for all possible combinations of pions. LÄS MER