Essays about: "Erik Linnér"

Found 4 essays containing the words Erik Linnér.

  1. 1. Ensemble Green's Function Theory for Interacting Electrons with Degenerate Ground States

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

    Author : Erik Linnér; [2019]
    Keywords : Green s function; Degeneracy; Density matrix; Ensemble; GW; Zero-temperature; Finite-temperature; Hubbard model; Two-dimensional harmonic oscillator; Ising model; Hydrogen-like model; Physics and Astronomy;

    Abstract : An ensemble Green's function theory for many-electron systems with degenerate ground states, based on the von Neumann density matrix formalism, is proposed. The formalism is constructed without an assumption of an adiabatic connection. An ensemble analogue of Hedin's equations and the GW Approximation (GWA) is constructed. READ MORE

  3. 2. Equivalence of the sine-Gordon Model and the Massive Thirring Model: Derivations and Application

    University essay from Lunds universitet/Teoretisk partikelfysik - Geonomgår omorganisation

    Author : Erik Linnér; [2017]
    Keywords : sine-Gordon model; Thirring model; Schwinger model; Bosonization; Physics and Astronomy;

    Abstract : The equivalence of the sine-Gordon model and the massive Thirring model, (1+1) dimensional theories of a single scalar field respectively a single Dirac field, is derived by two alternative approaches. The equivalence is derived by a comparison of the perturbation expansions of the correlation functions of the theories around the corresponding massless theories. READ MORE

  4. 3. The Evolution of Board Functions in Gazelles

    University essay from Handelshögskolan i Stockholm/Institutionen för företagande och ledning

    Author : Erik Elmborg; Fredrik Linnér; [2013]
    Keywords : Board of Directors; Corporate Governance; Gazelles; Lifecycle; Entrepreneurship;

    Abstract : This paper describes a multiple case study of 14 Gazelles in Sweden and aims to identify what functions the Board of Directors have in these companies and how these functions evolve. Small companies and Gazelles in particular create the majority of all new jobs and therefore play an important role in society. READ MORE

  5. 4. Providing Short-Term Relief by Amending IAS 39 -the IASB's Mission?

    University essay from Göteborgs universitet/Företagsekonomiska institutionen

    Author : Stefan Linnér; Erik Olmsäter; [2011-06-22]
    Keywords : Reclassification; Financial Instrument; IAS 39; IASB; Fair Value; European Banks;

    Abstract : Background and Problem Discussion: As a reaction to the severe financial crisis of 2008, the IASB decided to amend IAS 39 after being subjected to extensive pressure from EU leaders and regulators. The amendment allows new types of reclassifications of financial instruments, with the result that changes in fair value of these instruments are no longer accounted for in the statement of income. READ MORE