Now showing items 122-141 of 735

  • Fredriksen, Åshild; Pecseli, Hans L.; Trulsen, Jan (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2008)
    Conditional sampling methods are generalized by applying a matched-filter on the reference signal. This generalized method is illustrated by data obtained in a magnetized toroidal plasma without rotational transform. By ...
  • de la Cruz Rodriguez, Jaime; Löfdahl, M.G.; Sütterlin, P.; Hillberg, T.; Rouppe, Van Der Voort Luc (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2015)
    The production of science-ready data from major solar telescopes requires expertise beyond that of the typical observer. This is a consequence of the increasing complexity of instruments and observing sequences, which ...
  • Chung, Dongwoo T.; Viero, Marco P.; Church, Sarah E.; Wechsler, Risa H.; Alvarez, Marcelo A.; Bond, John Richard; Breysse, Patrick C.; Cleary, Kieran A.; Eriksen, Hans Kristian Kamfjord; Foss, Marie Kristine; Gundersen, Joshua O.; Harper, Stuart H.; Ihle, Håvard Tveit; Keating, Laura C.; Murray, Norman; Padmanabhan, Hamsa; Stein, George F.; Wehus, Ingunn Kathrine (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2019)
    Line-intensity mapping is an emerging field of observational work, with strong potential to fit into a larger effort to probe large-scale structure and small-scale astrophysical phenomena using multiple complementary ...
  • Guerreiro, Nuno Miguel Rodrigues; Hansteen, Viggo; De Pontieu, Bart (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2013)
    Observations of transition region emission lines reveal the presence of redshifts in lines formed from the top of the chromosphere up to temperatures of about 2.5 × 105 K and blueshifts for temperatures above that. However, ...
  • Yang, Weiqiang; Pan, Supriya; Nunes, Rafael C.; Mota, David (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2020)
    We investigate a well known scenario of interaction in the dark sector where the vacuum energy is interacting with cold dark matter throughout the cosmic evolution in light of the cosmic microwave background (CMB) data ...
  • Von Marttens, Rodrigo F.; Lombriser, Lucas; Kunz, Martin; Marra, Valerio; Casarini, Luciano; Alcaniz, Jailson (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2020)
    We revisit the dark degeneracy that arises from the Einstein equations relating geometry to the total cosmic substratum but not resolving its individual components separately. We establish the explicit conditions for the ...
  • Abbott, T. M. C.; Aguena, M.; Alarcon, A.; Allam, S.; Allen, S.; Annis, J.; Avila, S.; Bacon, D.; Bechtol, K.; Bermeo, A.; Bernstein, G. M.; Bertin, E.; Bhargava, S.; Bocquet, S.; Brooks, D.; Brout, D.; Buckley-Geer, E.; Burke, D. L.; Carnero Rosell, A.; Carrasco Kind, M.; Carretero, J.; Castander, F. J.; Cawthon, R.; Chang, C.; Chen, X.; Choi, A.; Costanzi, Matteo; Crocce, M.; Da Costa, L. N.; Davis, T. M.; De Vicente, J.; DeRose, J.; Desai, S.; Diehl, H. T.; Dietrich, J. P.; Dodelson, S.; Doel, P.; Drlica-Wagner, A.; Eckert, K.; Eifler, T. F.; Elvin-Poole, J.; Estrada, J.; Everett, S.; Evrard, August E.; Farahi, A.; Ferrero, Ismael; Flaugher, B.; Fosalba, P.; Frieman, J.; García-Bellido, Juan; Gatti, M.; Gaztanaga, E.; Gerdes, David W.; Giannantonio, Tommaso; Giles, P.; Grandis, S.; Gruen, Daniel; Gruendl, Robert A.; Gschwend, J.; Gutierrez, G.; Hartley, W. G.; Hinton, S. R.; Hollowood, Devon L.; Honscheid, Klaus; Hoyle, B.; Huterer, D.; James, D. J.; Jarvis, M.; Jeltema, T.; Johnson, M. W. G.; Johnson, M. D.; Kent, S.; Krause, E.; Kron, R.; Kuehn, Kyler; Kuropatkin, N.; Lahav, Ofer; Li, Ting S.; Lidman, C.; Lima, M.; Lin, H.; MacCrann, N.; Maia, M. A. G.; Mantz, A.; Marshall, Jennifer L.; Martini, P.; Mayers, J.; Melchior, J.; Mena-Fernández, J.; Menanteau, F.; Miquel, Ramon; Mohr, Joseph J.; Nichol, Robert C.; Nord, B.; Ogando, R. L. C.; Palmese, Antonella; Paz-Chinchón, Francisco; Plazas, Andrés A.; Prat, Jaimie; Rau, M. M.; Romer, A. K.; Roodman, A.; Rooney, P.; Rozo, E.; Rykoff, Eli S; Sako, M.; Samuroff, S.; Sánchez, C.; Sanchez, E.; Saro, A.; Scarpine, V.; Schubnell, M.; Scolnic, D.; Serrano, S.; Sevilla-Noarbe, I.; Sheldon, E.; Smith, J. Allyn; Smith, M.; Suchyta, E.; Swanson, M. E. C.; Tarle, G.; Thomas, D.; To, C.; Troxel, M. A.; Tucker, D. L.; Varga, T. N.; von der Linden, A.; Walker, A. R.; Wechsler, Risa H.; Weller, Jochen; Wilkinson, R. D.; Wu, H.; Yanny, B.; Zhang, Y.; Zhang, Z.; Zuntz, Joseph (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
  • Gatti, Marco; Chang, C.; Friedrich, Oliver; Jain, B.; Bacon, D.; Crocce, Hector Martin; DeRose, J.; Ferrero, Ismael; Fosalba, P.; Gaztanaga, E.; Gruen, Daniel; Harrison, Ian; Jeffrey, Niall; MacCrann, Niall; McClintock, Thomas; Secco, L.; Whiteway, L.; Abbott, T. M. C.; Allam, Sahar; Annis, J.; Avila, Santiago; Brooks, D.; Buckley-Geer, Elizabeth; Burke, D. L.; Carnero Rosell, A.; Carrasco Kind, M.; Carretero, J.; Cawthon, R.; da Costa, L. N.; De Vicente, J.; Desai, Shantanu; Diehl, H. T.; Doel, P.; Eifler, T. F.; Estrada, J.; Everett, S.; Evrard, August E.; Frieman, J.; García-Bellido, Juan; Gerdes, David W.; Gruendl, Robert A.; Gschwend, J.; Gutierrez, G.; James, D. J.; Johnson, M. D.; Krause, E.; Kuehn, Kyler; Lima, M.; Maia, Marcio A G; March, Marisa; Marshall, Jennifer L.; Melchior, Peter; Menanteau, F.; Miquel, Ramon; Palmese, Antonella; Paz-Chinchón, Francisco; Plazas, Andrés A.; Sánchez, C.; Sanchez, E.; Scarpine, V.; Schubnell, M.; Santiago, S.; Sevilla-Noarbe, I.; Smith, Mathew; Soares-Santos, Marcelle; Suchyta, E.; Swanson, M. E. C.; Tarle, G.; Thomas, D.; Troxel, M. A.; Zuntz, Joseph (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
    ABSTRACT We present a simulated cosmology analysis using the second and third moments of the weak lensing mass (convergence) maps. The second moment, or variances, of the convergence as a function of smoothing ...
  • 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 ...
  • L'Huillier, Benjamin; Winther, Hans Arnold; Mota, David; Park, Changbom; Kim, Juhan (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2017)
    We study the properties of dark matter haloes in a wide range of modified gravity models, namely, f(R), DGP and interacting dark energy models. We study the effects of modified gravity and dark energy on the internal ...
  • Rasmussen, Maren (Master thesis / Masteroppgave, 2020)
    The CO Mapping Array Pathfinder (COMAP) experiment is an intensity mapping experiment, currently in an early stage where learning how to process the data is one of the top points on the priority list. This includes the ...
  • Yang, Weiqiang; Pan, Supriya; Vagnozzi, Sunny; Di Valentino, Eleonora; Mota, David; Capozziello, Salvatore (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2019)
    While the origin and composition of dark matter and dark energy remains unknown, it is possible that they might represent two manifestations of a single entity, as occurring in unified dark sector models. On the other hand, ...
  • Zumalacárregui, Miguel; Koivisto, Tomi Sebastian; Mota, David (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2013)
    It is shown that a disformally coupled theory in which the gravitational sector has the Einstein-Hilbert form is equivalent to a quartic Dirac-Born-Infeld Galileon Lagrangian, possessing nonlinear higher derivative ...
  • Ellewsen, Thor Andreas Seiff (Master thesis / Masteroppgave, 2017)
    In order to determine the observable signatures of modified gravity theories, it is important to consider the effect of baryonic physics. We use a modified version of the ISIS code to run cosmological hydrodynamic simulations ...
  • Seiff Ellewsen, Thor Andreas; Falck, Bridget Lynn; Mota, David (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2018)
    In order to determine the observable signatures of modified gravity theories, it is important to consider the effect of baryonic physics. We used a modified version of the ISIS code to run cosmological hydrodynamic simulations ...
  • Panopoulou, Georgia V.; Tassis, Konstantinos; Skalidis, Raphael; Blinov, Dmitriy; Liodakis, Ioannis; Pavlidou, Vasiliki; Potter, Stephen B.; Ramaprakash, Anamparambu N.; Readhead, Anthony C. S.; Wehus, Ingunn Kathrine (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2019)
    The availability of large data sets with stellar distance and polarization information will enable a tomographic reconstruction of the (plane-of-the-sky-projected) interstellar magnetic field in the near future. We demonstrate ...
  • Holhjem, Karianne (Master thesis / Masteroppgave, 2006)
    Two galaxy clusters, Abell 1351 and Abell 1995, are examined using weak gravitational lensing techniques. Mass maps are created, and the clusters' density and shear profiles are compared to theoretical predictions. Gravitational ...
  • Neyrinck, Mark; Szapudi, Istvan; McCullagh, N.; Szalay, Alexander S; Falck, Bridget Lynn; Wang, Jie (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2018)
    The most common statistic used to analyse large-scale structure surveys is the correlation function, or power spectrum. Here, we show how ‘slicing’ the correlation function on local density brings sensitivity to interesting ...
  • Golding, Thomas Peter; Carlsson, Mats; Leenaarts, Jorrit (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2014)
    Helium ionization plays an important role in the energy balance of the upper chromosphere and transition region. Helium spectral lines are also often used as diagnostics of these regions. We carry out one-dimensional ...
  • Martinez-Sykora, Juan; De Pontieu, Bart Walter; Leenaarts, Jorrit; Pereira, Tiago Mendes Domingos; Carlsson, Mats; Hansteen, Viggo; Stern, J. V.; Tian, H; McIntosh, S.W.; Rouppe, Van Der Voort Luc (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2013)
    We have performed a three-dimensional radiative MHD simulation of the solar atmosphere. This simulation shows a jet-like feature that shows similarities to the type II spicules observed for the first time with Hinode's ...