Browsing Department of Mathematics and Physics (TN-IMF) by Subject "fysikk"
Now showing items 41-60 of 90
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An Invariant Characterization of the Levi-Civita Spacetimes
(Peer reviewed; Journal article, 2021-08)In the years 1917–1919 Tullio Levi-Civita published a number of papers presenting new solutions to Einstein’s equations. This work, while partially translated, remains largely inaccessible to English speaking researchers. ... -
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. ... -
Lattice Monte Carlo simulation and phase transitions in scalar field theories
(Masteroppgave/UIS-HF-IMF/2019;, Master thesis, 2019-06-15)The cubic anisotropy model is a simple scalar field theory with a phase transition of either first- or second order depending on the values of its parameters, with similarities to the electroweak phase transition that ... -
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 ... -
Lithiation of Carbon terminated silicon Carbide Surface
(Masteroppgave/UIS-TN-IMF/2019;, Master thesis, 2019-06-14)With the aim of searching for a promising Anode material for lithium ion batteries, quantum espresso modelling of the introduction of Lithium into the carbon terminated Silicon Carbide (SiC) Surface layers with the bottom ... -
Matching the Nonequilibrium Initial Stage of Heavy Ion Collisions to Hydrodynamics with QCD Kinetic Theory
(Peer reviewed; Journal article, 2019-03)High-energy nuclear collisions produce a nonequilibrium plasma of quarks and gluons which thermalizes and exhibits hydrodynamic flow. There are currently no practical frameworks to connect the early particle production in ... -
A mathematical approach to Wick rotations
(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 ... -
Modelling fire occurrences in heavy goods vehicles in Norwegian road tunnels
(Masteroppgave/UIS-TN-IMF/2019;, Master thesis, 2019-06-15)This master thesis project has been organized to scrutinize current incident data on near fires and fully developed fires in Norwegian road tunnels longer than 500 meter. This length is chosen because it is assumed that ... -
New benchmarks in the modelling of X-ray atomic form factors
(Peer reviewed; Journal article, 2023)Analytical representations of X-ray atomic form factor data have been determined. The original data, f0(s;Z), are reproduced to a high degree of accuracy. The mean absolute errors calculated for all s = sin θ/λ and Z values ... -
A new variational discretization technique for initial value problems bypassing governing equations
(Peer reviewed; Journal article, 2023-03)Motivated by the fact that both the classical and quantum description of nature rest on causality and a variational principle, we develop a novel and highly versatile discretization prescription for classical initial value ... -
Nil-Killing vector fields and Kundt structures
(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 ... -
No room to hide: implications of cosmic-ray upscattering for GeV-scale dark matter
(Peer reviewed; Journal article, 2023)The irreducible upscattering of cold dark matter by cosmic rays opens up the intriguing possibility of detecting even light dark matter in conventional direct detection experiments or underground neutrino detectors. The ... -
Non-equilibrium quantum field dynamics in the early Universe
(PhD thesis UiS;, Doctoral thesis, 2023)Inflation is the leading paradigm of early Universe cosmology. It provides compelling explanations of the observed near-homogeneity of the cosmic microwave background (CMB) radiation, the spatial flatness of the Universe ... -
Nonperturbative analysis of the electroweak phase transition in the two Higgs doublet model
(Journal article; Peer reviewed, 2018-11)We perform a nonperturbative study of the electroweak phase transition (EWPT) in the two Higgs doublet model (2HDM) by deriving a dimensionally reduced high-temperature effective theory for the model, and matching to known ... -
On a class of integrable systems of Monge-Ampère type
(Journal article; Peer reviewed, 2017-06)We investigate a class of multi-dimensional two-component systems of Monge-Ampère type that can be viewed as generalisations of heavenly type equations appearing in a self-dual Ricci-flat geometry. Based on the Jordan-Kronecker ... -
On Universal Black Holes
(Peer reviewed; Journal article, 2020)Recent results on universal black holes in d dimensions are summarized. These are static metrics with an isotropy-irreducible homogeneous base space which can be consistently employed to construct solutions to virtually ... -
On-shell recursion relations for nonrelativistic effective field theories
(Peer reviewed; Journal article, 2021-10)We derive on-shell recursion relations for nonrelativistic effective field theories (EFTs) with enhanced soft limits. The recursion relations are illustrated through analytic calculation of tree-level scattering amplitudes ... -
Opacity dependence of elliptic flow in kinetic theory
(Peer reviewed; Journal article, 2019-09)The observation of large azimuthal anisotropies vn in the particle spectra of proton–proton (pp) and proton–nucleus (pA) collisions challenges fluid dynamic interpretations of vn, as it remains unclear how small collision ... -
Open-quantum-systems approach to in-medium heavy quarkonium dynamics
(Peer reviewed; Journal article, 2023)Heavy quarkonium continues to play a central role in the study of nuclear matter under extremes of temperature and density in relativistic heavy-ion collisions. In this talk I report on recent developments in the theoretical ... -
Overall and relative Survival for Cancer Patients
(Masteroppgave/UIS-TN-IMF/2019;, Master thesis, 2019-06)In this thesis, basic concepts of survival analysis such as censoring, truncation and survival functions are described. Measures of survival ( i.e overall survival, net survival and relative survival ratio) and ...