Sökning: "fermions"

Visar resultat 1 - 5 av 35 uppsatser innehållade ordet fermions.

  1. 1. Integrability and Thermodynamics of the Gross-Neveu Model

    Master-uppsats, KTH/Fysik

    Författare :Valdemar Melin; [2023]
    Nyckelord :Mathematical Physics; Quantum Field Theory; Bethe Ansatz; Gross-Neveu Model; Matematisk fysik; kvantfältteori; Bethe-ansatsen; Gross-Neveu-modellen;

    Sammanfattning : The Gross-Neveu model is a quantum field theory of interacting N-flavor fermions in 1+1dimensions, with interaction term $(\bar{\psi}_f\psi_f )^2$. This model is studied using the property offactorized scattering. LÄS MER

  3. 2. Investigation of the mean photon energy in Kompaneets spectra

    Master-uppsats, KTH/Fysik

    Författare :Richárd Bagi; [2023]
    Nyckelord :Astroparticle Physics; Kompaneets equation; Astropartikelfysik; Kompaneetsekvationen;

    Sammanfattning : The Kompaneets equation describes the spectrum formation when hot fermions are injected into an opaque fermion-photon plasma in thermal equilibrium and inverse Compton-scatterings occur. The equation has three free parameters, the initial plasma thermal energy θ_u, the final plasmathermal energy θ_r and the average photon energy gain y_r. LÄS MER

  4. 3. 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

  5. 4. Spin correlations in top quark pair production at the Large Hadron Collider

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

    Författare :Simon Ahlstedt; [2022]
    Nyckelord :Top quarks; Top quark pair production; LHC; Spin correlations; MadGraph5_aMC@NLO; Dilepton decay channel; Leading order; Interference effects; Event generation.; Physics and Astronomy;

    Sammanfattning : In this work we investigate the spin correlation effect of the interference between signal and irreducible background events present in top quark pair production at the LHC at LO in the dilepton channel. To simulate the high energy proton-proton collisions of the LHC, MadGraph5_aMC@NLO framework is used as an event generator. LÄS MER

  7. 5. Strain-induced nonlinear Hall effect in graphene systems

    Master-uppsats, Stockholms universitet/Fysikum

    Författare :Pedram Pakmehr; [2022]
    Nyckelord :;

    Sammanfattning : This thesis aims to study the nonlinear electrical transport response of monolayer and bilayer graphene systems under the influence of different lattice deformations (strain). Broken inversion and rotation symmetries can generate a second-order transverse current response called the nonlinear Hall effect in the presence of time-reversal symmetry. LÄS MER