Now showing items 410-429 of 519

• (Master thesis / Masteroppgave, 2018)
• (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2018)
Multiple modifications of general relativity (GR) have been proposed in the literature in order to understand the nature of the accelerated expansion of the Universe. However, thus far all the predictions of GR have been ...
• (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2017)
Reproduced with permission from Astronomy & Astrophysics, © ESO 2017
• (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2018)
We present results derived from the analysis of spectropolarimetric measurements of active region AR12546, which represents one of the largest sunspots to have emerged onto the solar surface over the last 20 years. The ...
• (Master thesis / Masteroppgave, 2018)
In the 2015 Planck Isotropy and Statistics article, the dipolar asymmetry previously found in the WMAP data (Hansen et al. 2009) was found to extend to the smallest scales. While the statistical significance of this anomaly ...
• (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2016)
The Planck catalogue of SZ sources limits itself to a significance threshold of 4.5 to ensure a low contamination rate by false cluster candidates. This means that only the most massive clusters at redshift z> 0.5, and in ...
• (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2016)
Context. The solar chromosphere is the interface between the solar surface and the solar corona. Modelling of this region is difficult because it represents the transition from optically thick to thin radiation escape, ...
• (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2015)
We present polarization observations of two Galactic plane fields centered on Galactic coordinates (l, b) = (0°, 0°) and (329°, 0°) at both Q (43 GHz) and W bands (95 GHz), covering between 301 and 539 square degrees ...
• (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 ...
• (Master thesis / Masteroppgave, 2019)
Investigating properties of vortices formed in the superfluid dark matter picture, along with the parameter space of the model.
• (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2017)
Ellerman bombs (EBs) are brightenings in the Hα line wings that are believed to be caused by magnetic reconnection in the lower atmosphere. To study the response and evolution of the chromospheric line profiles, we perform ...
• (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2016)
We describe a new quiet-Sun phenomenon which we call quiet-Sun Ellerman-like brightenings (QSEB). QSEBs are similar to Ellerman bombs (EB) in some respects but differ significantly in others. EBs are transient brightenings ...
• (Master thesis / Hovedoppgave, 2005)
During inflation, the potential of the inflaton scalar field $\phi$, drives the exponential expansion of the Universe. The nature of the inflaton potential is presently unknown, but one hopes to learn more from observations ...
• (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 ...
• (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2018)
We present, for the first time, numerical simulations of young tidal dwarf galaxies (TDGs), including a self-consistent treatment of the tidal arm in which they are embedded. Thereby, we do not rely on idealized initial ...
• (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2013)
Several extensions of general relativity and high energy physics include scalar fields as extra degrees of freedom. In the search for predictions in the nonlinear regime of cosmological evolution, the community makes use ...
• (Series / Serietittel, 1950)
• (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2015)
Transverse magnetohydrodynamic waves have been shown to be ubiquitous in the solar atmosphere and can, in principle, carry sufficient energy to generate and maintain the Sun's million-degree outer atmosphere or corona. ...
• (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2017)
Motivated by observational and theoretical work that suggest very small-scale (≲ 1 pc) structure in the circumgalactic medium of galaxies and in other environments, we study Lyman-α (Lyα) radiative transfer in an extremely ...
• (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2018)
The baryonic content and physical properties of the warm and hot (105 lesssim T lesssim 107 K) phases of the circumgalactic medium (CGM) are poorly constrained owing to the lack of observables probing the requisite range ...