Essays about: "Hartree-Fock method"

Showing result 1 - 5 of 10 essays containing the words Hartree-Fock method.

  1. 1. The Bloch-Messiah theorem and its application to overlaps

    University essay from Lunds universitet/Matematisk fysik; Lunds universitet/Fysiska institutionen

    Author : Frieder Selisko; [2023]
    Keywords : Physics and Astronomy;

    Abstract : The Bogoliubov transformation is the starting point for the Hartree-Fock-Bogoliubov method and thus for many theoretical approaches that describe heavy nuclei. This transformation is based on two matrices, denoted by U and V, which are called Bogoliubov amplitudes. In this paper the properties of these matrices are investigated. READ MORE

  3. 2. Green's Functions Investigations in Quantum Transport Geometries

    University essay from Lunds universitet/Matematisk fysik; Lunds universitet/Fysiska institutionen

    Author : Philip Johansson; [2022]
    Keywords : Quantum transport; Green s functions; self-energy; non-equilibrium; many-body physics; Physics and Astronomy;

    Abstract : In this thesis we employ the non-equilibrium Green’s function (NEGF) method to study both finite and infinite systems. We develop a codebase capable of computing the steady state interacting NEGF in open systems, i.e. READ MORE

  4. 3. Exploring the application of neural networks in predictions of nuclear binding energies

    University essay from Lunds universitet/Matematisk fysik; Lunds universitet/Fysiska institutionen

    Author : Martin Waites; [2020]
    Keywords : neural networks; drip-line; nuclear physics; binding energy; exotic nuclei; Hartree-Fock-Bogolyubov; Physics and Astronomy;

    Abstract : In this project the locations of the proton and neutron drip-lines are predicted using neural networks and theoretical data obtained by applying the HFBTHO program. For each of the neural networks a comparison is made between neural network predictions and experimental data in the region experimental data exists. READ MORE

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

    University essay from Lunds universitet/Matematisk fysik; Lunds universitet/Fysiska institutionen

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

    Abstract : 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. READ MORE

  6. 5. Excited States in Variational Many-Body Approaches

    University essay from Lunds universitet/Matematisk fysik; Lunds universitet/Fysiska institutionen

    Author : David Gustafsson; [2018]
    Keywords : quantum mechanics; many-body problems; excited states; Hartree-Fock method; variational method; VAMPIR; Physics and Astronomy;

    Abstract : A method is implemented wherein numerical approximations to the ground and first few excited states of a quantum mechanical N -body 1D harmonic oscillator are found through variational methods, representing the states as a linear combination of normalized pseudo-states which are themselves linear combinations of non-orthogonal Slater determinants. These states are then used as a low energy basis for configuration interaction. READ MORE