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Showing result 1 - 5 of 9 essays matching the above criteria.

  1. 1. Discussions on Dai-Freed Anomalies

    University essay from Uppsala universitet/Teoretisk fysik

    Author : Huaiyu Li; [2019]
    Keywords : Anomaly; Quantum Fields Theory; Dai-Freed Theorem; Topology;

    Abstract : In both field theories of high energy physics and field theories of condensed matter theories anomalies have been imposing constraints and bringing up new theories. While the perturbational and local anomalies from triangle diagrams are well-developed, we follow and review two works leading to non-perturbational global anomalies both related with Atiyah-Patogi-Sieger (APS) index theorem. READ MORE

  3. 2. Supersymmetric Quantum Mechanics, Index Theorems and Equivariant Cohomology

    University essay from Uppsala universitet/Teoretisk fysik

    Author : Hans Nguyen; [2018]
    Keywords : supersymmetry; SUSY; quantum mechanics; index theorem; path integral; non-linear sigma model; spin complex; Chern-Gauss-Bonnet theorem; Witten index; equivariant cohomology; Weil model; Cartan model;

    Abstract : In this thesis, we investigate supersymmetric quantum mechanics (SUSYQM) and its relation to index theorems and equivariant cohomology. We define some basic constructions on super vector spaces in order to set the language for the rest of the thesis. READ MORE

  4. 3. Structural Diagnosis Implementation of Dymola Models using Matlab Fault Diagnosis Toolbox

    University essay from Linköpings universitet/Fordonssystem

    Author : Petter Lannerhed; [2017]
    Keywords : Diagnosis; Structural Methods; Observer Construction;

    Abstract : Models are of great interest in many fields of engineering as they enable prediction of a systems behaviour, given an initial mode of the system. However, in the field of model-based diagnosis the models are used in a reverse manner, as they are combined with the observations of the systems behaviour in order to estimate the system mode. READ MORE

  5. 4. On Eggs and Baskets: An Empirical Study of the Relation between Debt Capacity and Corporate Diversification

    University essay from Handelshögskolan i Stockholm/Institutionen för finansiell ekonomi

    Author : Anna Moroz; Tom Der Kinderen; [2014]
    Keywords : Diversification; Debt Capacity; Leverage; Co-Insurance Theorem; Credit Ratings;

    Abstract : Economic Theory suggests that corporate diversification has a positive impact on firm debt carrying capacity. The cash flows of a diversified firm's segments result, when imperfectly correlated, in reduced volatility of total cash flows and increased debt carrying capacity. READ MORE

  6. 5. Index Theorems and Supersymmetry

    University essay from Uppsala universitet/Teoretisk fysik

    Author : Andreas Eriksson; [2014]
    Keywords : Aiyah-Singer Index Theorem: Witten Index: Supersymmetric Quantum Mechanics; Path Integrals;

    Abstract : The Atiyah-Singer index theorem, the Euler number, and the Hirzebruch signature are derived via the supersymmetric path integral. Concisely, the supersymmetric path integral is a combination of a bosonic and a femionic path integral. READ MORE