Browsing Department of Mathematics and Physics (TN-IMF) by Subject "VDP::Matematikk og Naturvitenskap: 400"
Now showing items 21-40 of 58
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A GIT construction of degenerations of Hilbert schemes of points
(Peer reviewed; Journal article, 2019)We present a Geometric Invariant Theory (GIT) construction which allows us to construct good projective degenerations of Hilbert schemes of points for simple degenerations. A comparison with the construction of Li and Wu ... -
Handling estimation error in Statistical Process Control with EWMA charts
(Masteroppgave/UIS-TN-IMF/2020;, Master thesis, 2020-06)This master thesis studies the process control analysis using control charts. It starts with a detailed presentation of the basic types of control charts, with a special focus on the EWMA control chart. An excessive ... -
Heavy quarkonium in extreme conditions
(Peer reviewed; Journal article, 2020)In this report we review recent progress achieved in the understanding of heavy quarkonium under extreme conditions from a theory perspective. Its focus lies both on quarkonium properties in thermal equilibrium, as well ... -
Importance Sampling-based Transport Map Hamiltonian Monte Carlo for Bayesian Hierarchical Models
(Peer reviewed; Journal article, 2021-06)We propose an importance sampling (IS)-based transport map Hamiltonian Monte Carlo procedure for performing a Bayesian analysis in nonlinear high-dimensional hierarchical models. Using IS techniques to construct a transport ... -
Improved background subtraction and a fresh look at jet sub-structure in JEWEL
(Peer reviewed; Journal article, 2022)Interactions of hard partons in the Quark Gluon Plasma (QGP) created with relativistic heavy ion collisions lead to characteristic modifications of the internal structure of reconstructed jets. A large part of the observed ... -
Information in Local Curvature: Three Papers on Adaptive Methods in Computational Statistics
(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 ... -
Inhomogeneous chiral condensate in the quark-meson model
(Journal article, 2017)The two-flavor quark-meson model is used as a low-energy effective model for QCD to study inhomogeneous chiral condensates at finite baryon chemical potential μ B. The parameters of the model are determined by matching the ... -
Introduction to Supersymmetry
(Masteroppgave/UIS-TN-IMF/2020;, Master thesis, 2020-06)This thesis covers the mathematical foundations of supersymmetry, and looks at the simplest non-trivial example of supersymmetry in physics, the Wess-Zumino model. On the way we will also explicitly calculate the Poincar´e ... -
Investigation of crystal field, magnetic frustration and magnetization reversal effects in 4f and 3d oxides
(PhD thesis UiS;, Doctoral thesis, 2022-09)This thesis deals with the investigation of single-ion excitations, magnetic frustration, and magnetization reversal phenomena. We have employed neutron scattering, μ+SR, and computational methods for these studies. Inverse ... -
Investigation of glitches induced by single-crystal diamond compound refractive lenses based on crystal orientation
(Peer reviewed; Journal article, 2019)Single-crystal diamond is considered as an ideal material for compound refractive lenses (usually abbreviated to “CRLs”) mainly due to its stability when bathed in strong X-ray radiation. Since CRLs come into operation by ... -
Involutions of Quadrics
(Masteroppgave/UIS-TN-IMF/2020;, Master thesis, 2020-07-09)In the introductory chapter, we will explain briefly what all this work is about. First is worthy to mention that the most included area is algebraic geometry, which of course is a combination of algebra and linear algebra. ... -
Left-Invariant Pseudo-Riemannian Metrics on Lie Groups
(Masteroppgave/UIS-TN-IMF/2020;, Master thesis, 2020)n differential geometry and mathematical physics, there is interest in left-invariant pseudo-Riemannian metrics on Lie groups. We learn and review Lie theory, representation theory, geometric invariant theory, and differential ... -
Lil3 dimerization and chlorophyll binding in Arabidopsis thaliana
(Peer reviewed; Journal article, 2015)The two-helix light harvesting like (Lil) protein Lil3 belongs to the family of chlorophyll binding light harvesting proteins of photosynthetic membranes. A function in tetrapyrrol synthesis and stabilization of geranylgeraniol ... -
Lithiation of Silicon Carbide.
(Masteroppgave/UIS-TN-IMF/2018;, Master thesis, 2018-06-15)Nowadays, different material like: lithium, silicon, germanium and tin are under investigation as possible anode materials for Lithium ion batteries (LIBs.) The function of anode in LIB is to accommodate the lithium ion ... -
Log-density gradient covariance and automatic metric tensors for Riemann manifold Monte Carlo methods
(Peer reviewed; Journal article, 2023)A metric tensor for Riemann manifold Monte Carlo particularly suited for nonlinear Bayesian hierarchical models is proposed. The metric tensor is built from symmetric positive semidefinite log-density gradient covariance ... -
Multimessenger Constraints for Ultradense Matter
(Peer reviewed; Journal article, 2022)Recent rapid progress in neutron-star (NS) observations offers great potential to constrain the properties of strongly interacting matter under the most extreme conditions. In order to fully exploit the current observational ... -
New tests for trend in time censored recurrent event data
(Peer reviewed; Journal article, 2024-01)We consider testing for trend in recurrent event data. More precisely, for such data we consider testing of the null hypothesis of data coming from a renewal process. The new tests are essentially obtained by considering ... -
New tests for trend in time censored recurrent event data
(Peer reviewed; Journal article, 2024)We consider testing for trend in recurrent event data. More precisely, for such data we consider testing of the null hypothesis of data coming from a renewal process. The new tests are essentially obtained by considering ... -
Nonrelativistic effective field theories with enhanced symmetries and soft behavior
(Peer reviewed; Journal article, 2022)We systematically explore the landscape of nonrelativistic effective field theories with a local S-matrix and enhanced symmetries and soft behavior. The exploration is carried out using both conventional quantum field ... -
Optimisation of Thimble simulations and quantum dynamics of multiple fields in real time
(Peer reviewed; Journal article, 2022)We apply the Generalised Thimble approach to the computation of exact path integrals and correlators in real-time quantum field theory. We first investigate the details of the numerical implementation and ways of optimizing ...