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Now showing items 1-64 of 64

(Doctoral thesis / Doktoravhandling, 2019)

**flatene**på blant annet diamanter og saltkrystaller...

(Doctoral thesis / Doktoravhandling, 2019)

The Standard Model of particle physics is an extremely successful theory checked to very high precision. Its last prediction, the Higgs boson, was discovered in 2012. Yet we know now that it is not complete. The main reason ...

(Doctoral thesis / Doktoravhandling, 2018)

We investigate two-dimensional quantum turbulence and plasticity from a common mathematical perspective, focusing on topological defects as the most important degrees of freedom. Quantum turbulence features quantized ...

(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2018)

A phase-field model of a crystalline material is introduced to develop the necessary theoretical framework to study plastic flow due to dislocation motion. We first obtain the elastic stress from the phase-field crystal ...

(Journal article / Tidsskriftartikkel / SubmittedVersion, 2018)

We discuss the relation between the strength of the self-interaction ofdark matter particles and the predicted properties of the inner density distributionsof dark matter haloes. We present the results ofN-body simulations ...

(Doctoral thesis / Doktoravhandling, 2018)

Today there is an insurmountable evidence that there is much more invisible matter in the universe than the visible kind that makes up the galaxies, stars and planets. This invisible matter, known as Dark matter (DM) in ...

(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2018)

A consistent small-scale description of plasticity and dislocation motion in a crystalline solid is presented based on the phase field crystal description. By allowing for independent mass motion and lattice distortion, ...

(Journal article / Tidsskriftartikkel / SubmittedVersion, 2018)

The observed surface densities of dark matter halos are known to follow a simple scaling law, ranging from dwarf galaxies to galaxy clusters, with a weak dependence on their virial mass. Here we point out that this can not ...

(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2017)

We establish a statistical relationship between the inverse energy cascade and the spatial correlations of clustered vortices in two-dimensional quantum turbulence. The Kolmogorov spectrum k− 5 / 3 on inertial scales r ...

(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2017)

Mapping the complex heterogeneity of vascular tissue in the brain is important for understanding cerebrovascular disease. In this translational study, we build on previous work using vessel architectural imaging (VAI) and ...

(Master thesis / Masteroppgave, 2016)

This thesis is devoted to the topic of one- and two-dimensional models of topological superconductivity. We study the Kitaev chain subject to closed and open boundary conditions. In the closed chain, we derive the energy ...

(Master thesis / Masteroppgave, 2016)

We investigate the feasibility of discovering supersymmetry at the Large Hadron Collider (LHC) from the pair production of the second lightest neutralinos or the lightest charginos, where each decays to jet pairs, via a W ...

(Master thesis / Masteroppgave, 2016)

(Master thesis / Masteroppgave, 2016)

In order to investigate gamma ray signals from dark matter originating from close to the black hole at the galactic center, we investigate the effects of general relativity on such a signal. The expression for the photon ...

(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2015)

Antideuterons are a potential messenger for dark matter annihilation or decay in our own Galaxy, with very low backgrounds expected from astrophysical processes. The standard coalescence model of antideuteron formation, ...

(Journal article / Tidsskriftartikkel / PublishedVersion, 2015)

© 2015 American Physical Society

(Doctoral thesis / Doktoravhandling, 2015)

Antideuteron cosmic rays constitute a promising channel for indirect detection of dark matter, and experimental data sensitive to prospective dark matter signals can be expected in the near future. The antideuteron channel ...

(Master thesis / Masteroppgave, 2015)

Vi bruker numeriske beregninger til å studere ett et-atom to-nivå laser, hvor atomet er sterkt koblet til en feltmode i kaviteten. Vi undersøker parameterrommet til systemet. Vi finner en analytisk løsning som viser at ...

(Master thesis / Masteroppgave, 2015)

We have used a Potts model with long-range interactions to model the effective interactions between adsorbates placed at random positions on a graphene surface and calculate the critical temperatures.

(Master thesis / Masteroppgave, 2015)

Vi undersøker ein metode, opphavleg foreslått i [1], for å bestemme massane til resonansar og usynlege sluttilstandar i kaskadehenfall, i teoriar utanfor Standardmodellen med ein paritetssymmetri. Vi gjer undersøkinga vår ...

(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2014)

We investigate the production of antideuterons from decaying dark matter, using gravitinos in supersymmetric models with trilinear R-parity-violating (RPV) operators as an example. The model used for antideuteron formation ...

(Master thesis / Masteroppgave, 2014)

In this thesis we investigated magnetic excitations in the iridate compound Sr2IrO4. As a layered strongly correlated system it can be described by the two-dimensional one-band Hubbard model, describing interacting particles ...

(Master thesis / Masteroppgave, 2014)

An important question in the theory of general relativity is to decide whether this theory contains the general principle of relativity for accelerated motion (including rotation). This question is also related to Mach's ...

(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2014)

Supersymmetric models with a small chargino-neutralino mass difference, and as a result metastable charginos, have been a popular topic of investigation in collider phenomenology. The possibility of a chargino lighter than ...

(Master thesis / Masteroppgave, 2014)

(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2014)

Supersymmetric models with R-parity violation (RPV) have become more popular following the lack of any excess of missing energy events at the 8 TeV LHC. To identify such models, the suggested searches generally rely on the ...

(Master thesis / Masteroppgave, 2014)

(Doctoral thesis / Doktoravhandling, 2014)

(Master thesis / Masteroppgave, 2013)

We study the rotational properties of a two-component Bose gas trapped in a rotating harmonic potential, effectively in two dimensions. We first consider a completely homogeneous interaction between particles, and assume ...

(Master thesis / Masteroppgave, 2013)

Linear-chain ferromagnets such as \ce{CoCl_2\cdot 2H_2 O} have been shown to be capable of magnetic Bloch oscillations. This means that domain walls in he material undergo Bloch oscillations, resulting in an oscilling ...

(Doctoral thesis / Doktoravhandling, 2013)

(Master thesis / Masteroppgave, 2013)

The purpose of this thesis is to examine the temporal evolution of open quantum systems, and to give the reader an introduction to this field. We will discuss why this can not be treated in the same manor as the evolution ...

(Master thesis / Masteroppgave, 2012)

(Master thesis / Masteroppgave, 2012)

In this thesis the width of the gravitino under radiative loop decays ~G-> Znu and ~G-> W+l- in R-parity violating SUSY with trilinear R-parity violating couplings is calculated. It is compared to other decay channels and ...

(Master thesis / Masteroppgave, 2012)

Nyere arbeid innen kvanteinformasjonsteknologi foreslår å kombinere enkeltatomer og enkeltfotoner for å danne gunnlag for kvantekommunikasjon og -beregninger. I slike oppsett vil evnen til å produsere og manipulere ...

(Master thesis / Masteroppgave, 2012)

Memory capacitance, or memcapacitance, is part of the relative new concept of memristive systems. These are resistive, capacitive and inductive systems where their properties are dependent on previous dynamics. The purpose ...

(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2012)

We calculate the antideuteron yield in dark matter annihilations on an event-by-event basis using the herwig++ Monte Carlo generator. We present the resulting antideuteron fluxes for quark and gauge boson final states. As ...

(Master thesis / Masteroppgave, 2012)

(Master thesis / Masteroppgave, 2012)

During the last decades, technology has made it possible to produce devices at
smaller and smaller length scales. Central in these devices are their
conducting properties, as they can be made very clean, making it easy
for ...

(Doctoral thesis / Doktoravhandling, 2011)

(Master thesis / Masteroppgave, 2010)

Sammenligner forskjellige modeller av den fraksjonelle kvante-Hall effekten og deres prediksjoner av kvasipartiklenes statistiske vinkler.

(Doctoral thesis / Doktoravhandling, 2010)

(Master thesis / Masteroppgave, 2010)

This thesis begins with a brief introduction of Einstein’s general theory of relativity, and the applications of this theory to modern cosmology. We will, in this application, go through some classical, spatially homogeneous ...

A Visual Approach to Mathematical Physics with Geometric Algebra Restricted Access

(Master thesis / Masteroppgave, 2010)

(Master thesis / Masteroppgave, 2010)

Det er en todelt oppgave hvor første del omhandler atom-interferometri basert på lyspulser. Mekaniske effekter på atomer fra lys er diskutert. To spesifikke interferometer er diskutert i detalj. Tilslutt noen anvendelser.
Den ...

(Master thesis / Masteroppgave, 2010)

This thesis sets out to explore the methods of and the space available when adding new quarks to
the particle content of the Standard Model and the Left-Right Symmetric Model (LRSM).
Most observations of interactions ...

(Master thesis / Masteroppgave, 2010)

In theoretical physics there is a well known analogy between general relativity and electrodynamics which is based on a linearization of Einstein's field equation. Such a kind of analogy is interesting since Einstein's ...

(Doctoral thesis / Doktoravhandling, 2010)

I dette doktorgradsarbeidet har vi studert hudens evne til å binde vann og hvordan dette påvirker hudens elektriske egenskaper. Vi har også introdusert en helt ny byggestein – memristoren – i bioelektrisk modellering, noe ...

(Master thesis / Masteroppgave, 2009)

We introduce some modern mathematical and theoretical tools in 2-dimensional physics, and apply them to the Ising model. We rederive some well-known results, but also some new properties of this important model. All the ...

(Master thesis / Masteroppgave, 2009)

Machs prinsipp angår et bredt spekter av fenomener knyttet til hvordan ting vekselvirker på lange, til og med kosmologiske, avstander. I denne masteroppgaven gir jeg en historisk oversikt over forskning som har foregått ...

(Master thesis / Masteroppgave, 2009)

Oppgaven gir en innføring i anyoner, partikler med fraksjonell statistikk som kun finnes i to-dimensjonale systemer. Disse partiklene interpolerer mellom bosoner og fermioner, og derfor behandles også de to-dimensjonale ...

(Master thesis / Masteroppgave, 2009)

This thesis is a study of coherence theory in light in classical
electromagnetism and quantum optics. %The coherence is quantified
Specifically two quantities are studied: The degree of first-order
temporal coherence, which ...

(Master thesis / Masteroppgave, 2008)

The equation of motion for a classical charged point particle in curved space-time is given by the generalized Lorentz-Abraham-Dirac equation. This equation contains a nonlocal term called the tail term, which consists of ...

(Doctoral thesis / Doktoravhandling, 2008)

The present work is a study of the relationship between a quantum Hall system and its one-dimensional representation. The standard theory, which is based on general arguments, predicts that the edge of the quantum Hall ...

(Master thesis / Masteroppgave, 2008)

(Master thesis / Masteroppgave, 2008)

Study of galactic dynamics using models based on general relativity.

(Master thesis / Masteroppgave, 2007)

In this paper we aim to study a small step in the physicist marathon that is the unifica- tion of two field theories that, while similar in some senses, are rather different in other, namely gravity and electromagnetism. ...

(Master thesis / Masteroppgave, 2006)

From the time of its introduction, the standard model has become a very well established model in particle physics. In fact, no experiment so far has shown any violation of this model. Still, there are some unsatisfying ...

(Master thesis / Hovedoppgave, 2006)

(Master thesis / Masteroppgave, 2006)

Oppgaven ser på muligheten for å buke fotoassosiasjon som metode
for å produsere kalde molekyler. Det gjøres eksplisitte regninger
for Litium molekylet, og undersøkes i hvilken grad vi kan forvente
å produsere ultrakalde ...

(Master thesis / Hovedoppgave, 2005)

The ekpyrotic universe is a brane cosmology theory with an alternative explanation of the big bang as a collision between two hyperplanes. We first introduce the reader to brane objects in the context of string theory, and ...

(Master thesis / Hovedoppgave, 2003)

The main objective of this thesis is to consider the concept of
gravitational entropy from a perturbative point of view. A flat,
matter dominated universe model is subjected to a linear perturbation,
and the entropic ...

(Master thesis / Hovedoppgave, 2002)

In this thesis I discuss various topics relating to the definition of
particles and vacuum states in quantum field theory in general, and
apply it to non-inertial reference frames in Minkowski spacetime. The
particle concept ...

(Master thesis / Hovedoppgave, 1998)

Chern-Simons-Ginzburg-Landau (CSGL) theory is an attempt of a
phenomenological description of the fractional quantum Hall effect.
The CSGL theory is studied mainly without considering the direct
applications of the results. ...