Now showing items 339-358 of 655

  • Li, Baojiu; Mota, David; Barrow, J. D. (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2011)
    We introduce the N-body simulation technique to follow structure formation in linear and nonlinear regimes for the extended quintessence models (scalar-tensor theories in which the scalar field has a self-interaction ...
  • 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 ...
  • Oppizzi, Filippo; Renzi, Alessandro; Liguori, Michele; Hansen, Frode Kristian; Marinucci, Domenico; Baccigalupi, Carlo; Bertacca, Daniele; Poletti, Davide (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2020)
    Foreground components in the Cosmic Microwave Background (CMB) are sparse in a needlet representation, due to their specific morphological features (anisotropy, non-Gaussianity). This leads to the possibility of applying ...
  • Garay, Carlos Peña; Verde, Licia; Jimenez, Raul (Journal article / Tidsskriftartikkel / SubmittedVersion, 2017)
    Recent constrains on the sum of neutrino masses inferred by analyzing cosmological data, show that detecting a non-zero neutrino mass is within reach of forthcoming cosmological surveys. Such a measurement will imply a ...
  • 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 ...
  • Ovaldsen, Jan-Erik (Master thesis / Hovedoppgave, 2002)
    Five years (1992-1997, ~2650 images) of optical observations of the gravitational lens system QSO 0957+561 were analyzed using a new photometry package developed by Jan Teuber and me. My supervisor was Prof. Rolf Stabell, ...
  • Park, Min-Jung; Yi, Sukyoung K; Dubois, Yohan; Pichon, Christophe; Kimm, Taysun; Devriendt, Julien; Choi, Hoseung; Volonteri, Marta; Kaviraj, Sugata; Peirani, Sebastien (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2019)
    The origin of the disk and spheroid of galaxies has been a key open question in understanding their morphology. Using the high-resolution cosmological simulation New Horizon, we explore kinematically decomposed disk and ...
  • Nagy, J. M.; Ade, P. A. R.; Amiri, M.; Benton, S. J.; Bergman, A. S.; Bihary, R.; Bock, J. J.; Bond, J. R.; Bryan, S. A.; Chiang, H. C.; Contaldi, C. R.; Doré, O.; Duivenvoorden, Adri J.; Eriksen, Hans Kristian Kamfjord; Farhang, M.; Filippini, J. P.; Fissel, L. M.; Fraisse, A. A.; Freese, K.; Galloway, M.; Gambrel, Anne E.; Gandilo, N. N.; Ganga, K.; Gudmundsson, J. E.; Halpern, M.; Hartley, J.; Hasselfield, M.; Hilton, G.; Holmes, W.; Hristov, V. V.; Huang, Z.; Irwin, K. D.; Jones, W. C.; Kuo, C. L.; Kermish, Z. D.; Li, S.; Mason, P. V.; Megerian, K.; Moncelsi, Lorenzo; Morford, T. A.; Netterfield, C. B.; Nolta, M.; Padilla, I. L.; Racine, Benjamin; Rahlin, A. S.; Reintsema, C.; Ruhl, J. E.; Runyan, M. C.; Ruud, Tone Melvær; Shariff, J. A.; Soler, J. D.; Song, X.; Trangsrud, A.; Tucker, C.; Tucker, R. S.; Turner, A. D.; Van der List, J. F.; Weber, A. C.; Wehus, Ingunn Kathrine; Wiebe, D. V.; Young, E. Y. (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2017)
    © 2017. The American Astronomical Society. All rights reserved.
  • Kakiichi, Koki; Dijkstra, Mark (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2018)
    We present a new perturbative approach to ‘constrained Ly α radiative transfer’ (RT) through the circum- and intergalactic medium (CGM and IGM). We constrain the H I content and kinematics of the CGM and IGM in a physically ...
  • Golding, Thomas Peter; Leenaarts, Jorrit; Carlsson, Mats (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2016)
    The ionization state of the gas in the dynamic solar chromosphere can depart strongly from the instantaneous statistical equilibrium commonly assumed in numerical modeling. We improve on earlier simulations of the solar ...
  • Golding, Thomas Peter (Doctoral thesis / Doktoravhandling, 2017)
  • Rutten, Robert (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2019)
    This is an overview of non-equilibrium aspects of the formation of solar continua and lines affecting the contributions by magnetic network and plage to spectrally resolved solar irradiance. After a brief summary of these ...
  • Rudjord, Øystein (Doctoral thesis / Doktoravhandling, 2010)
  • Llinares, Claudio; Hagala, Robert; Mota, David (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2019)
    The quintessence model is one of the simplest and better known alternatives to Einstein’s theory for gravity. The properties of the solutions have been studied in great detail in the background, linear and non-linear ...
  • hong, Jie; Ding, M. D.; Li, Ying; Carlsson, Mats (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2018)
    The Fe i 6173 Å line is widely used in the measurements of vector magnetic fields by instruments including the Helioseismic and Magnetic Imager (HMI). We perform non-local thermodynamic equilibrium calculations of this ...
  • Lind, K.; Amarsi, A. M.; Asplund, M.; Barklem, P. S.; Bautista, M.; Bergemann, M.; Collet, R.; Kiselman, D.; Leenaarts, Jorrit; Mendes Domingos Pereira, Tiago (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2017)
    Our ability to model the shapes and strengths of iron lines in the solar spectrum is a critical test of the accuracy of the solar iron abundance, which sets the absolute zero-point of all stellar metallicities. We use an ...
  • 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 ...
  • Bakke, Helle; Frogner, Lars; Gudiksen, Boris Vilhelm (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2018)
    Context: We introduce a model for including accelerated particles in pure magnetohydrodynamics (MHD) simulations of the solar atmosphere. Aims: We show that the method is viable and produces results that enhance the realism ...
  • Nóbrega Siverio, Daniel Elias; Moreno-Insertis, Fernando; Martinez-Sykora, Juan; Carlsson, Mats; Szydlarski, Mikolaj Marcin (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2019)
    Context. Magnetic flux emergence from the solar interior has been shown to be a key mechanism for unleashing a wide variety of phenomena. However, there are still open questions concerning the rise of the magnetized plasma ...
  • Olluri, Kosovare (Doctoral thesis / Doktoravhandling, 2014)
    De siste par tiårene har avanserte forskningssatellitter og rombaserte observatorier gitt oss innsikt i en svært dynamisk solatmosfære, hvor lokale variable som temperatur og tetthet endres på korte tidsskalaer. Disse ...