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Now showing items 31-40 of 1278
(Master thesis / Masteroppgave, 2007)
Gravitational lensing has played an important role in cosmology since the discovery of the first gravitational lensing system in 1979 (Walsh et al.), where the quasar QSO 0957+561 can be seen in two images. Such multiple ...
(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 ...
(Master thesis / Masteroppgave, 2007)
(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 ...
(Master thesis / Masteroppgave, 2008)
(Master thesis / Masteroppgave, 2009)
The cosmic microwave background (CMB) radiation at 2.7 K is the leftover radiation from the Big Bang.
By studying this radiation we can extract much information about the universe we live in.
CMB experiments over the last ...
(Master thesis / Masteroppgave, 2008)
Observations of how matter is distributed on different length scales in the universe are an important test of cosmological models. For example, such observations can give an upper limit for the mass of neutrinos: As the ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2018)
Context: Various solar features can be seen in emission or absorption on maps of the Sun in the millimetre and submillimetre wavelength range. The recently installed Atacama Large Millimetre/submillimetre Array (ALMA) is ...
(Master thesis / Masteroppgave, 2008)
In between the Cosmic Microwave Background (CMB) and the instrument there are other sources of radiation, called foregrounds. The foregrounds radiate in the same frequency bands as the background, and cause contamination ...
(Master thesis / Masteroppgave, 2008)
Observations of the Cosmic Microwave Background is impaired by other astrophysical sources that also radiate in the microwave spectrum. These other, non-CMB sources are known as foregrounds. In this thesis, three different ...