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Testing Quadru- and Octopolar Asymmetry in Planck Data 
Jønvik, Sara Clausen (Master thesis / Masteroppgave, 2017)
We perform an investigation of quadru- and octopolar asymmetry in the CMB data by expanding the on the study of alignment and angular clustering of the dipole components of the CMB power distribution across multipoles l = ...
Kinetic screening of fields and stability of NEC violating configurations 
Forfang, Peder (Master thesis / Masteroppgave, 2017)
Following the discovery of the late-time acceleration, a multitude of extensions to General Relativity have been developed, seeking to shed light on this new phenomenon. Some of these models involve couplings to ordinary ...
Establishing the host galaxy contribution to spectroscopic data of the nuclear emission of active galactic nuclei 
Hammerstrøm, Maria (Master thesis / Masteroppgave, 2017)
In order to estimate the mass of supermassive black holes found in the centres of active galactic nuclei (AGNs) from spectroscopic data, the contamination from the light emitted by the stars in the surrounding host galaxy ...
Early Science with the Next Generation Transit Survey 
Hodzic, Vedad (Master thesis / Masteroppgave, 2017)
The Next Generation Transit Survey (NGTS) is an ongoing wide-field exoplanet transit survey at ESO Paranal Observatory, Chile. It is searching for Neptune and super-Earth size planets around nearby stars using 12 robotic ...
New AlterBBN: A Code for Big Bang Nucleosynthesis with Light Dark Matter 
Jenssen, Espen Sem (Master thesis / Masteroppgave, 2016)
The universe is full of stuff we cannot see, neither directly or indirectly. We do not understand the nature of the mysterious dark matter and how it interacts with normal matter. Big Bang Nucleosynthesis (BBN) provides ...
Being a Bat in Space: Measuring Distances Inside Active Galactic Nuclei Using Reverberation Mapping 
Sommer, Natalia Eiré (Master thesis / Masteroppgave, 2016)
Coronal Heating by Magnetic Reconnection - Calculations of Quasi-Separatrix Layers 
Grav, Bjarne (Master thesis / Masteroppgave, 2016)
Several decades ago it was discovered that the outer layers of the Sun are much hotter than the photosphere. The mechanism or mechanisms heating the outer solar layers are not known, so this is known as the coronal heating ...
The Reduced Visibility of Lyman-alpha Flux from Galaxies at z > 6 due to Evolving Gas Kinematics 
Barve, Christopher Backløf (Master thesis / Masteroppgave, 2016)
Recent observations support a significantly reduced visibility of Lyman-α (Lyα) flux from galaxies at redshifts z > 6. This is surprising considering that the visibility of Lyα flux has been observed to increase up towards ...
Massive neutrinos and spherical collapse in LCDM and DGP gravity 
Sand, Odd Petter (Master thesis / Masteroppgave, 2016)
Spherical collapse is a crude, but useful toy model for structure formation in an expanding universe. Previous works have looked at this model in ΛCDM with massive neutrinos, where the primary findings were that massive ...
Late Kinetic Decoupling of Dark Matter 
Ihle, Håvard Tveit (Master thesis / Masteroppgave, 2016)
If dark matter, after it has become non-relativistic, scatters elastically with a relativistic heat bath particle, then the resulting pressure leads to acoustic oscillations that suppress the growth of overdensities in the ...
Analysis on foreground cleaning methods for the CMB:Locating the residuals by correlation 
Sharma, Saurav (Master thesis / Masteroppgave, 2016)
A Statistical Analysis of Strong Gravitational Lensing in Planck Sunyaev-Zel'dovich Selected Galaxy Clusters 
Markel, Evan Benjamin Edmund (Master thesis / Masteroppgave, 2016)
The Planck Sunyaev-Zeldovich Cluster catalogue provides an all-sky set of SZ detected galaxy clusters, which is the first of its kind. SZ signals are independent of redshift which allows a greater volume of space to be ...
Distinguishing screening mechanisms with environment-dependent velocity statistics 
Ivarsen, Magnus Fagernes (Master thesis / Masteroppgave, 2016)
The Light of the TARDIS 
Hauge, Lars Christian (Master thesis / Masteroppgave, 2015)
In 2013 a new metric called TARDIS was introduced. This metric was published by Tippet and Tsang, and described a time machine. This thesis uses numerical methods to explore properties of this new metric. We start by ...
Distinguishing between gravity theories with galaxy peculiar velocity statistics 
Fauli, Robert Olav (Master thesis / Masteroppgave, 2015)
The ΛCDM model used in modern cosmology has major theoretical problems. To attempt to solve these many modified gravity theories have been proposed. We calculate velocity statistics (streaming pair-wise velocities and the ...
Cosmological simulations with disformally coupled symmetron fields 
Hagala, Robert (Master thesis / Masteroppgave, 2015)
In this thesis, we investigate statistical properties of the redshift zero matter distribution in disformal gravity through N-body simulations. The disformal model studied here is a conformally coupled field in a symmetron ...
TOWARDS A MORE REALISTIC TREATMENT OF POLARISATION IN LYMAN ALPHA RADIATIVE TRANSFER 
Eide, Marius Berge (Master thesis / Masteroppgave, 2015)
An Improved Model of Wouthuysen-Field Coupling around Galaxies 
Toresen, Mikael (Master thesis / Masteroppgave, 2015)
In this thesis we have implemented a basic radiative transfer code to model the radial Lyα scattering rate around the epoch when the first stars and galaxies start forming, and ionizing their surroundings. The model, builds ...
Multi-wavelength observations of magnetic bright points (MBPs) in the lower solar atmosphere 
Izadparast, Masoumeh (Master thesis / Masteroppgave, 2015)
Magnetic bright points (MBPs) are small-scale (generally kG) magnetic features, ubiqui- tous in the lower solar atmosphere, and are a manifestation of solar magnetism. They represent the cross-sections of thin flux tubes ...
Chromospheric Microjets in the Penumbra of a Sunspot 
Drews, Ainar (Master thesis / Masteroppgave, 2014)
In this thesis chromospheric features called Penumbral Microjets (PMJs) are investigated in a sunspot. Observations of high resolution in space, time and wavelength from the Swedish 1-meter Solar Telescope (SST) are used ...
Cosmology of Symmetron Mass-Varying Neutrinos 
Frontéri, Paul Anthony (Master thesis / Masteroppgave, 2014)
In this thesis we investigate a dynamical cosmological constant called the quintessence. Quintessence is a scalar field varying in both space and time following a chosen potential. To explain the coincidence problem, e.g. ...
Kosmologi og vekselvirkninger mellom baryoner, mørk materie og mørk energi 
Oppen, Henrik (Master thesis / Masteroppgave, 2014)
Studier av vekselvirkningsmodeller for baryonsk materie, mørk materie og mørk energi. Hovedfokus på stabilitet for universmodeller, sammenligning med observasjonelle data og konsekvenser for strukturformasjoner.
N-body simulations with massive neutrinos 
Opheimsbakken, Håkon (Master thesis / Masteroppgave, 2014)
Neutrinos are very weakly interacting particles with a low mass. In fact, the mass of the neutrinos has not yet been determined by experiments or observations. Still, neutrinos are a good candidate for some of the dark ...
Numerical radiative transfer using a multigrid method 
Bjørgen, Johan Pires (Master thesis / Masteroppgave, 2014)
Solving the non-LTE radiative transfer problem in stellar atmospheres is computationally demanding. There is therefore an interest to investigate new methods to solve this problem effectively. A numerical method, multigrid, ...
Gravitational Redshift of Clusters in the Symmetron and Chameleon f(R) Models 
Grönke, Max (Master thesis / Masteroppgave, 2013)
The gravitational redshift in clusters of galaxies can be measured to probe gravity as was first done by Wojtak et al. (2011). Using N -body simulations we are able to analyze the gravitational redshift profiles for the ...
Dark energy with an Anisotropic Equation of State 
Lee, Eunseong (Master thesis / Masteroppgave, 2013)
We investigate cosmologies where the accelerated expansion of the universe is driven by a fluid with an anisotropic equation of state. If dark energy equation of state is anisotropic, the expansion rate of the universe ...
Investigation of dynamic fibrils in H-alpha 6563 and ca II 8542 
Jordahl, Elisabeth (Master thesis / Masteroppgave, 2013)
Non-metric Quintessence 
Tayfeh, Bagheri F. (Master thesis / Masteroppgave, 2013)
The existence of dark energy in the universe is hypothesized to explain the accelerated expansion of today’s universe and the inflationary expansion of very early universe; accelerated expansion of today’s universe is ...
Halo finding in Modified Gravity N-body simulations 
Tennøe, Simen (Master thesis / Masteroppgave, 2013)
Modified gravity theories are a popular research field in the hope that they could explain some of the unanswered questions in cosmology, for example how the universe starts, evolves and ends. One way to test proposed ...
Cosmological Dynamics, Statistics and Numerical Techniques of f(R) Gravity 
Hammami, Amir (Master thesis / Masteroppgave, 2012)
Inflation is a much discussed topic within the field of cosmology; it represents a time in the history of the Universe where a very rapid, exponential expansion was taking place. This expansion is needed in order for the ...
Searching for B-modes with QUIET: A reanalysis of the first-season Q-band data 
Ruud, Tone Melvær (Master thesis / Masteroppgave, 2012)
The Q/U-Imaging ExperimenT (QUIET) is a ground-based coherent polarimeter experiment, primarily targeting the detection of low-l B-mode polarization in the CMB. Such modes are a signature of primordial tensor perturbations, ...
On how the heating of the Solar Corona depends on the complexity of the magnetic field in the Solar Photosphere 
Færder, Øystein Håvard (Master thesis / Masteroppgave, 2012)
The solar corona has a temperature of order 1 MK, which is almost 200 times the temperature of the underlying surface. This fact has puzzled solar physicists for more than six decades. As of today, most solar physicists ...
The Inverse-C shape of the {\Caiinm} Spectral Line 
Hole, Ida Benedikte Amlie (Master thesis / Masteroppgave, 2012)
The inverse-C shape of the bisector from the chromospheric Ca triplet spectral lines is a little understood phenomena. This spectral signature can give valuble information about the chromosphere, which is the least understood ...
Gradient Statistics for Cosmic Microwave Background Analysis 
Udnes, Cathrine (Master thesis / Masteroppgave, 2011)
There have been many reports on anomalies in the CMB from different research groups. In this work statistical tests using the gradients of the CMB temperature, applied to the seven year WMAP data, have been investigated. ...
High Resolution Observations of Spicules Type II 
Skogsrud, Håkon (Master thesis / Masteroppgave, 2011)
Spicules are relatively small, narrow and elongated structures that stick out above the edge of the solar disk. They are very dynamic and appear as jets that shoot out into the outer solar atmosphere. Up until recently, ...
Spherical Collapse in Dark Energy Models 
Nielsen, Robert (Master thesis / Masteroppgave, 2011)
This thesis is a study of the dynamics and virialization of cosmic structures in the framework of flat cosmological models where the properties of the dark energy component plays an important role in the global and local ...
A Quadratic Estimator for Statistical Anisotropy in the Cosmic Microwave Background 
Saxrud, Svein Rune (Master thesis / Masteroppgave, 2011)
The standard model of cosmology has proven to be a great success. Through measurements of the Cosmic Microwave Background radiation, cosmologists have been able to constrain parameters such as the age and geometry of the ...
Astrophysical and cosmological axion bounds 
Sivertsen, Sofie Vike (Master thesis / Masteroppgave, 2011)
The existence of dark matter is a well established fact both due to galaxy rotation curves and also due to the CMB temperature anisotropies and the matter power spectra. According to the $\Lambda$CDM model, the so called ...
Chameleon model with field-dependent couplings 
Winther, Hans Arnold (Master thesis / Masteroppgave, 2010)
We investigate scalar-field theories with a field-dependent coupling to matter and show the existence of a chameleon mechanism. The thin-shell solutions for a spherical body are found, and used to investigate the consequences ...
Massive neutrinos and cosmology : a study of the effects of the mass hierarchy 
Grindstad, Maren Klemetsen (Master thesis / Masteroppgave, 2010)
Neutrino cosmology is a very interesting field of research, where properties of some of the smallest constituents of the universe are probed by the very largest structures of the universe; large scale structures of the ...
Hydrogen ionization in 3d solar atmosphere models 
Golding, Thomas Peter (Master thesis / Masteroppgave, 2010)
The solar chromosphere is a region where the thermodynamics are out of equilibrium, and realistic values of temperature and electron densities here are difficult to obtain. Hydrogen, being the most abundant element in solar ...
On a Controversy Regarding Primordial Gravitational Waves 
Gjerløw, Eirik (Master thesis / Masteroppgave, 2010)
The theory of inflation gives certain predictions for the amount of primordial gravitational waves compared to the amount of density perturbations. These predictions are, in principle, verifiable through observation of the ...
Heavy element abundances in the second parameter globular cluster pair NGC288/362. 
Wilson, Paul A. (Master thesis / Masteroppgave, 2010)
Using needlets to estimate the power spectrum 
Ingebrigtsen, Tony Asle (Master thesis / Masteroppgave, 2010)
The statistical analysis of the Cosmic Microwave Background radiation to make estimates of the Power Spectrum is a comutationally heavy operation, involving large covariance matrices. In this thesis I explore the possibility ...
Star formation rate and dynamical state of galaxy clusters 
Skorbakk, Ine (Master thesis / Masteroppgave, 2010)
In this thesis the correlation between star formation and dynamical state of a statistical well defined selection of galaxy clusters have been studied. From simulations and theory it is expected strong correlations between ...
 
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Masteroppgave (45)
AuthorBarve, Christopher Backløf (1)Bjørgen, Johan Pires (1)Drews, Ainar (1)Eide, Marius Berge (1)Fauli, Robert Olav (1)... View More
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