Recent Submissions

  • Equivalences between Calabi–Yau manifolds and roofs of projective bundles 

    Rampazzo, Marco (PhD thesis UiS;, Doctoral thesis, 2021-04)
    It is conjectured that many birational transformations, called K-inequalities, have a categorical counterpart in terms of an embedding of derived categories. In the special case of simple K-equivalence (or more generally ...
  • Information in Local Curvature: Three Papers on Adaptive Methods in Computational Statistics 

    Lunde, Berent Ånund Strømnes (PhD thesis UiS;562, Doctoral thesis, 2020-11)
    Advanced statistical computations have become increasingly important, as with the increased flexibility of models capturing complex relationships in new data and use-cases, comes increased difficulties of fitting procedures ...
  • A mathematical approach to Wick rotations 

    Helleland, Christer (PhD thesis UiS;536, Doctoral thesis, 2020-09)
    In this thesis we define Wick-rotations mathematically using pseudo-Riemannian geometry, and relate Wick-rotations to real geometric invariant theory (GIT). We discover some new results concerning the existence of Wick ...
  • Nil-Killing vector fields and Kundt structures 

    Aadne, Matthew Terje (PhD thesis UiS;529, Doctoral thesis, 2020-06)
    This thesis is based on three papers, for which two have been submitted for publication and one is published. A chapter presenting relevant background material is included giving convenient access to preliminary foreknowledge ...
  • The experimental and theoretical investigation of single-crystal diamond compound refractive lenses (CRLs) 

    Zhang, Qiuyuan (PhD theses (TN-IMF);527, Doctoral thesis, 2020-06)
    In the field of X-ray optics, compound refractive lenses (usually termed CRLs) function as a focusing device for hard X-rays and they are believed to possess a lot of prominent advantages over other focusing devices, such ...
  • Tales from Wonderland 

    Normann, Ben David (Doctoral thesis, 2020-06)
    Knowing that the Universe is quite isotropic, one may, as already discussed in Chapter 1, wonder how likely such a Universe is. We take the following research question. Question 1. Is the asymptotic future of a cosmology ...
  • Essays in statistics and econometrics 

    Osmundsen, Kjartan Kloster (PhD thesis UiS; 523, Doctoral thesis, 2020-05)
    Helped by cheaper data computation, companies make more use of sophisticated statistical analysis in decision making and economic management. In the dissertation I evaluate and develop statistical methods and apply them ...