Sökning: "Fock"

Visar resultat 1 - 5 av 30 uppsatser innehållade ordet Fock.

  1. 1. Asymptotic Symmetries and Faddeev-Kulish states in QED and Gravity

    Master-uppsats, Stockholms universitet/Fysikum

    Författare :David Gaharia; [2019]
    Nyckelord :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;

    Sammanfattning : 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

  2. 2. Symmetry restoration of HFB states using projection

    Uppsats för yrkesexamina på grundnivå, Lunds universitet/Matematisk fysik; Lunds universitet/Fysiska institutionen

    Författare :Carl Frostenson; [2019]
    Nyckelord :Symmetry restoration; Projection; HFB; nuclear physics; nuclear; Physics and Astronomy;

    Sammanfattning : The restoration of particle number and angular momentum symmetry using projection operators has been theoretically investigated for mean-field Hartree-Fock-Bogoliubov (HFB) states. A computer code for the projection of particle number was then implemented. LÄS MER

  3. 3. Industrialiseringens gröna kulturarv. Tre exempel på grönområden med koppling till industrialismen

    Kandidat-uppsats, Göteborgs universitet/Institutionen för kulturvård

    Författare :Lisa Fock Nilsson; [2018-06-19]
    Nyckelord :Parks; green areas; industrialism; Stockholmsskolan;

    Sammanfattning : Uppsats för avläggande av filosofie kandidatexamen med huvudområdet kulturvård med inriktning landskapsvård, VT 2018,.... LÄS MER

  4. 4. Variational approach to the many-body problem with error estimation

    Master-uppsats, Lunds universitet/Matematisk fysik; Lunds universitet/Fysiska institutionen

    Författare :Claes Rogius Svensson; [2018]
    Nyckelord :Many-body problems; Slater determinants; variational approach; Physics and Astronomy;

    Sammanfattning : In this thesis a method for doing approximate calculations of the ground state of quantum mechanical many-body systems is developed and implemented. This method uses the Hartree-Fock method as a starting point and approximates the ground state as a linear combination of non-orthogonal Slater determinants. LÄS MER

  5. 5. Near-local density approximation approach to one-dimensional lattice systems

    Kandidat-uppsats, Lunds universitet/Matematisk fysik; Lunds universitet/Fysiska institutionen

    Författare :Basheer Joudeh; [2018]
    Nyckelord :DFT; Hartree; Hartree-Fock; LDA; BALDA; Mean-field; Hubbard; SOFT; Physics and Astronomy;

    Sammanfattning : Describing many-body quantum systems has been an analytically and computationally challenging task since the advent of quantum mechanics. However, in the past 50 years as a result of our technological advancement and the emergence of methods such as density-functional theory (DFT), we have taken crucial steps forward regarding our ability to study and understand large quantum systems. LÄS MER