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Viser treff 1023-1042 av 1277

  • Scalar perturbations in f(T) gravity using the 1+3 covariant approach 
    Sahlu, Shambel; Ntahompagaze, Joseph; Abebe, Amare; de la Cruz Dombriz, Álvaro; Mota, David (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
  • SCALAR: an AMR code to simulate axion-like dark matter models 
    Mina, Mattia; Mota, David; Winther, Hans Arnold (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
    We present a new code,SCALAR, based on the high-resolution hydrodynamics andN-body codeRAMSES, to solve the Schrödingerequation on adaptive refined meshes. The code is intended to be used to simulate axion ...
  • Screening mechanisms in hybrid metric-Palatini gravity 
    Vargas dos santos, Marcelo; Alcaniz, Jailson S; Mota, David; Capozziello, Salvatore (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2018)
    We investigate the efficiency of screening mechanisms in the hybrid metric-Palatini gravity. The value of the field is computed around spherical bodies embedded in a background of constant density. We find a thin shell ...
  • Screening Modifications of Gravity Through Disformally Coupled Fields 
    Koivisto, Tomi Sebastian; Mota, David; Zumalacárregui, Miguel (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2012)
    It is shown that extensions to general relativity, which introduce a strongly coupled scalar field, can be viable if the interaction has a nonconformal form. Such disformal coupling depends upon the gradients of the scalar ...
  • Screenings in modified gravity: a perturbative approach 
    Aviles, Alejandro; Cervantes-Cota, Jorge L; Mota, David (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2019)
    We present a formalism to study screening mechanisms in modified theories of gravity through perturbative methods in different cosmological scenarios. We consider Einstein-frame posed theories that are recast as Jordan-frame ...
  • SDSS J2222+2745: A GRAVITATIONALLY LENSED SEXTUPLE QUASAR WITH A MAXIMUM IMAGE SEPARATION OF 15."1 DISCOVERED IN THE SLOAN GIANT ARCS SURVEY 
    Dahle, Håkon; Gladders, M. D.; Sharon, K.; Bayliss, M. B.; Wuyts, E; Abramson, L. E.; Koester, B. P.; Groeneboom, Nicolaas Ervik; Brinckmann, T. E.; Kristensen, M. T.; Lindholmer, M. O.; Nielsen, A; Krogager, J.-K.; Fynbo, J.P.U. (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2013)
    We report the discovery of a unique gravitational lens system, SDSS J2222+2745, producing five spectroscopically confirmed images of a zs = 2.82 quasar lensed by a foreground galaxy cluster at zl = 0.49. We also present ...
  • The SDSS-DR12 large-scale cross-correlation of damped Lyman alpha systems with the Lyman alpha forest 
    Pérez-Ràfols, Ignasi; Font-Ribera, Andreu; Miralda-Escudé, Jordi; Blomqvist, Michael; Bird, Simeon; Busca, Nicolás G.; du Mas des Bourboux, Hélion; Mas Ribas, Lluis; Noterdaeme, Pasquier; Petitjean, Patrick; Rich, James; Schneider, Donald P. (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2017)
    © 2017 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society
  • The search for inflationary B-mode signal with future CMB experiments 
    Aurvik, Ragnhild (Doctoral thesis / Doktoravhandling, 2023)
    The oldest radiation in the universe is the Cosmic Microwave Background (CMB) radiation. Analysing the CMB is like analysing a baby picture of the Universe, and gives us unique information on what the Universe looked like ...
  • Searching for anomalies in the cosmic microwave background 
    Groeneboom, Nicolaas Ervik (Doctoral thesis / Doktoravhandling, 2010)
  • 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, ...
  • Searching for stellar emission in the sub-THz bands 
    Kirkaune, Mats (Master thesis / Masteroppgave, 2023)
  • Self-consistent 3D radiative magnetohydrodynamic simulations of coronal rain formation and evolution 
    Kohutova, Petra; Antolin, Patrick; Popovas, Andrius; Szydlarski, Mikolaj Marcin; Hansteen, Viggo (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
    Context. Coronal rain consists of cool and dense plasma condensations formed in coronal loops as a result of thermal instability. Aims. Previous numerical simulations of thermal instability and coronal rain formation have ...
  • Self-similar space-time evolution of an initial density discontinuity 
    Rekaa, Vegard Lundby; Pecseli, Hans; Trulsen, Jan Karsten (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2013)
    The space-time evolution of an initial step-like plasma density variation is studied. We give particular attention to formulate the problem in a way that opens for the possibility of realizing the conditions experimentally. ...
  • Semi-empirical model atmospheres for the chromosphere of the sunspot penumbra and umbral flashes 
    Bose, Souvik; de Jorge Henriques, Vasco Manuel; Rouppe van der Voort, Luc; Mendes Domingos Pereira, Tiago (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2019)
    Context: The solar chromosphere and the lower transition region are believed to play a crucial role in the heating of the solar corona. Models that describe the chromosphere (and the lower transition region), accounting ...
  • Sensitivity and foreground modelling for large-scale cosmic microwave background B-mode polarization satellite missions 
    Remazeilles, M.; Dickinson, C.; Eriksen, Hans Kristian Kamfjord; Wehus, Ingunn Kathrine (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2016)
    The measurement of the large-scale B-mode polarization in the cosmic microwave background (CMB) is a fundamental goal of future CMB experiments. However, because of unprecedented sensitivity, future CMB experiments will ...
  • Shape of Clusters of Galaxies as a Probe of Screening Mechanisms in Modified Gravity 
    Llinares, Claudio; Mota, David (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2013)
    Scalar fields are crucial components in high energy physics and extensions of general relativity. The fact that they are not observed in the Solar System may be due to a mechanism which screens their presence in high dense ...
  • Shape-based clustering of synthetic Stokes profiles using k-means and k-Shape 
    Moe, Thore Espedal; Pereira, Tiago; Calvo, Flavio; Leenaarts, Jorrit (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2023)
    Context. The shapes of Stokes profiles contain a great deal of information about the atmospheric conditions that produced them. However, a variety of different atmospheric structures can produce very similar profiles. Thus, ...
  • Shock ignition of aluminium particle clouds in the low-temperature regime 
    Omang, Marianne Gjestvold; Hauge, Knut Ove (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
    In this paper, we present results from spontaneous ignition of aluminium particle clouds in a series of shock tube experiments. For all experiments, the shock propagates along a narrow pile of 40-μm aluminium particles. ...
  • SHORT DYNAMIC FIBRILS IN SUNSPOT CHROMOSPHERES 
    Rouppe, Van Der Voort Luc; de la Cruz Rodriguez, Jaime (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2013)
    Sunspot chromospheres display vigorous oscillatory signatures when observed using chromospheric diagnostics such as the strong Ca II lines and Hα. New high-resolution sunspot observations from the Swedish 1 m Solar Telescope ...
  • SI IV Resonance Line Emission during Solar Flares: Non-LTE, Nonequilibrium, Radiation Transfer Simulations 
    Kerr, Graham S.; Carlsson, Mats; Allred, Joel C.; Young, Peter R.; Daw, Adrian N. (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2019)