This collection contains a selection of the latest doctoral theses completed at the School of Mathematics. Please note this is not a comprehensive record.

Recent Submissions

  • Parabolic boundary value problems with rough coefficients 

    Dyer, Luke Oliver (The University of Edinburgh, 2018-11-29)
    This thesis is motivated by some of the recent results of the solvability of elliptic PDE in Lipschitz domains and the relationships between the solvability of different boundary value problems. The parabolic setting has ...
  • Crepant resolution conjecture for Donaldson-Thomas invariants via wall-crossing 

    Beentjes, Sjoerd Viktor (The University of Edinburgh, 2018-11-29)
    Let Y be a smooth complex projective Calabi{Yau threefold. Donaldson-Thomas invariants [Tho00] are integer invariants that virtually enumerate curves on Y. They are organised in a generating series DT(Y) that is interesting ...
  • Well-posedness of the one-dimensional derivative nonlinear Schrödinger equation 

    Moşincat, Răzvan Octavian (The University of Edinburgh, 2018-11-29)
    This thesis is concerned with the well-posedness of the one-dimensional derivative non-linear Schrodinger equation (DNLS). In particular, we study the initial-value problem associated to DNLS with low-regularity initial ...
  • Many server queueing models with heterogeneous servers and parameter uncertainty with customer contact centre applications 

    Qin, Wenyi (The University of Edinburgh, 2018-11-29)
    In this thesis, we study the queueing systems with heterogeneous servers and service rate uncertainty under the Halfin-Whitt heavy traffic regime. First, we analyse many server queues with abandonments when service rates ...
  • Singularities of noncommutative surfaces 

    Crawford, Simon Philip (The University of Edinburgh, 2018-11-29)
    The primary objects of study in this thesis are noncommutative surfaces; that is, noncommutative noetherian domains of GK dimension 2. Frequently these rings will also be singular, in the sense that they have infinite ...
  • On k-normality and regularity of normal projective toric varieties 

    Tran, Bach Le (The University of Edinburgh, 2018-07-02)
    We study the relationship between geometric properties of toric varieties and combinatorial properties of the corresponding lattice polytopes. In particular, we give a bound for a very ample lattice polytope to be k-normal. ...
  • Bridgeland stability conditions, stability of the restricted bundle, Brill-Noether theory and Mukai's program 

    Feyzbakhsh, Soheyla (The University of Edinburgh, 2018-11-29)
    In [Bri07], Bridgeland introduced the notion of stability conditions on the bounded derived category D(X) of coherent sheaves on an algebraic variety X. This topic is originally inspired by concepts in string theory and ...
  • Stochastic, distributed and federated optimization for machine learning 

    Konečný, Jakub (The University of Edinburgh, 2017-11-30)
    We study optimization algorithms for the finite sum problems frequently arising in machine learning applications. First, we propose novel variants of stochastic gradient descent with a variance reduction property that ...
  • Design of reliable aerospace system architecture 

    Schäfer, Lukas Matthias (The University of Edinburgh, 2018-11-29)
    Reliability and redundancy of safety-critical network systems is a paramount issue in system engineering. Be it in evaluating existing network systems or solving optimization problems for designing network systems, it ...
  • Statistical methods for the testing and estimation of linear dependence structures on paired high-dimensional data: application to genomic data 

    Mestres, Adrià Caballé (The University of Edinburgh, 2018-07-02)
    This thesis provides novel methodology for statistical analysis of paired high-dimensional genomic data, with the aimto identify gene interactions specific to each group of samples as well as the gene connections that ...
  • Heuristic methods for solving two discrete optimization problems 

    Cabezas García, José Xavier (The University of Edinburgh, 2018-07-02)
    In this thesis we study two discrete optimization problems: Traffic Light Synchronization and Location with Customers Orderings. A widely used approach to solve the synchronization of traffic lights on transport networks ...
  • Data sampling strategies in stochastic algorithms for empirical risk minimization 

    Csiba, Dominik (The University of Edinburgh, 2018-07-02)
    Gradient descent methods and especially their stochastic variants have become highly popular in the last decade due to their efficiency on big data optimization problems. In this thesis we present the development of data ...
  • Controlling optical beams in nematic liquid crystals 

    Tope, Bryan Keith (The University of Edinburgh, 2018-07-02)
    A major area of research recently has been the study of nonlinear waves in liquid crystals. The availability of commercial liquid crystals and the formation of solitons at mWpower levels has meant that experimental ...
  • Generalised Langevin equation: asymptotic properties and numerical analysis 

    Sachs, Matthias Ernst (The University of Edinburgh, 2018-07-02)
    In this thesis we concentrate on instances of the GLE which can be represented in a Markovian form in an extended phase space. We extend previous results on the geometric ergodicity of this class of GLEs using Lyapunov ...
  • Structure and semantics 

    Avery, Thomas Charles (The University of Edinburgh, 2017-11-30)
    Algebraic theories describe mathematical structures that are defined in terms of operations and equations, and are extremely important throughout mathematics. Many generalisations of the classical notion of an algebraic ...
  • On numerical approximations for stochastic differential equations 

    Zhang, Xiling (The University of Edinburgh, 2017-11-30)
    This thesis consists of several problems concerning numerical approximations for stochastic differential equations, and is divided into three parts. The first one is on the integrability and asymptotic stability with ...
  • Improved computational approaches to classical electric energy problems 

    Wallace, Ian Patrick (The University of Edinburgh, 2017-11-30)
    This thesis considers three separate but connected problems regarding energy networks: the load flow problem, the optimal power flow problem, and the islanding problem. All three problems are non-convex non linear problems, ...
  • Entanglement entropy of locally perturbed thermal systems 

    Štikonas, Andrius (The University of Edinburgh, 2017-11-30)
    In this thesis we study the time evolution of Rényi and entanglement entropies of thermal states in Conformal Field Theory (CFT). These quantities are usually hard to compute but Ryu-Takayanagi (RT) and Hubeny-Rangaman ...
  • Birational geometry of Fano fibrations 

    Krylov, Igor (The University of Edinburgh, 2017-07-10)
    An algebraic variety is called rationally connected if two generic points can be connected by a curve isomorphic to the projective line. The output of the minimal model program applied to rationally connected variety is ...
  • Modelling sustainable intensification in Brazilian agriculture 

    De Oliveira Silva, Rafael (The University of Edinburgh, 2017-07-10)
    At the United Nations Framework Conference on Climate Change COP15 (2009) Brazil presented ambitious commitments or Nationally Appropriate Mitigation Actions (NAMAs), to reduce greenhouse gases emissions (GHGs) mitigation ...

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